Aniceto Mendoza-Ruiz

• Master of Science
• Metropolitan Autonomous University

Pellaea (Pteridaceae) is a fern genus with a subcosmopolitan distribution. The spore morphology and gametophytic development of several species of this taxon have been studied and the presence of apogamy has been characteristically registered. The aim of this work was to describe and compare the prothallial development of eight species of Pellaea s...

Introducción y objetivo: Diversos trabajos han mostrado que el pecíolo posee características anatómicas útiles en la diferenciación de grupos, por lo que realizamos el estudio anatómico descriptivo y comparativo de las regiones basal, media y apical del pecíolo de 16 especies pertenecientes a 8 géneros de Polypodioideae que crecen en México, con la...

The collections of plants can be consulted in the herbariums, which are the places destined for their conservation. But for a good collection, we must consider several points, first, know the type of plant with which you will work, the study site and it is essential to have at hand the necessary implements to collect the plants effectively, later t...

Antecedentes: Santos Reyes Tepejillo, Oaxaca, carece de un inventario florístico integral. Elaborarlo permitirá contar con información para plantear estrategias de manejo y conservación de sus recursos vegetales. Preguntas: ¿Cuántas y cuáles especies de plantas vasculares hay en el municipio de Santos Reyes Tepejillo y en qué tipo de vegetación se...

Antecedentes y Objetivos: En la Sierra Norte de Puebla (SNP), México, el bosque mesófilo de montaña es el tipo de vegetación que alberga el mayor número de pteridofitas en el país; sin embargo, para esta zona aún faltan estudios sobre la riqueza de este grupo. El objetivo de este trabajo fue realizar el listado florístico de las licofitas y helecho...

Premise: Terminal velocity (Vt) is one main factor in biological particles dispersal but is scarcely studied for anemochorous fern spores. Moreover, the effect of spore characteristics on Vt has not been evaluated yet. In the present study, we measured the Vt of 1234 spores of 21 fern species and two Selaginella microspores with a video image analy...

Mesozoic ferns from Mexico have been the subject of serious academic endeavours since the beginning of the 20th Century, to understand these plants at the time of their peak diversity. Most findings have been made in a set of Middle Jurassic Basins of the Mixtec Terrain in the Oaxaca State. However, fossil ferns are scarce in other assemblages, so...

The first complete checklist of the Mexican vascular epiphytes is presented, accompanied by data relating to its geographical distribution by state, elevational range, endemism, life form and type of vegetation in which each species can be found. Based on the review of herbarium specimens and specialized literature, as well as in the collection o...

Antecedentes: Existen trabajos sobre la fase sexual para algunas especies de Thelypteridaceae, pero no hacen mención sobre tipos de germinación y desarrollo protálico. Pregunta: ¿Existe variación en el tipo de germinación y desarrollo protálico en los gametofitos de cuatro especies de la familia Thelypteridaceae? Especies de estudio: Cuatro especie...

Resumen: Antecedentes y Objetivos: Son pocos los trabajos florísticos que se han publicado sobre licofitas y helechos (pteridofitas en conjunto) de Puebla, México, por lo que se considera muy probable que la riqueza de especies en el estado sea mayor a la que se tiene documentada hasta el momento. El objetivo de este trabajo es reportar nuevos regi...

Antecedentes y Objetivos: Son pocos los trabajos florísticos que se han publicado sobre licofitas y helechos (pteridofitas en conjunto) de Puebla, México, por lo que se considera muy probable que la riqueza de especies en el estado sea mayor a la que se tiene documentada hasta el momento. El objetivo de este trabajo es reportar nuevos registros de...

Alpine vegetation is one of the most restricted ecosystems in Mexico. Its greatest extent occurs on the high peaks of the Trans-Mexican Volcanic Belt (TMVB). In this study we document fern diversity of the alpine vegetation of central Mexico, generate a floristic list, provide a key for determination, and report the elevational limits of the specie...

Two new prenylated acylphloroglucinols, paleacenins A (1) and B (2), were isolated from the rhizome n-hexane and chloroform extracts of the fern Elaphoglossum paleaceum. Both compounds were found to possess the same geranylated filicinic acid moiety but have a different phloroglucinol ring substituent. Their structures were determined using 1H and...

Helechos y licopodios de México provee un ejemplo de la belleza y diversidad de helechos y licofitas en el país. Estas plantas han sido una fuente constante de inspiración y fascinación para los interesados en el mundo natural. Las hojas de los helechos presentan diversas texturas y formas muy atractivas, lo que ha hecho que sean ampliamente utiliz...

Acrostichum is a pantropical genus and has four species, two of which occur in the Neotropics, A. aureum and A. danaeifolium. In Mexico, A. danaeifolium grows further in land wet soils and is much more common than A. aureum, which is typically found in brackish or saline habitats near the coast, and is restricted to coastal saline mangrove communit...

Lycophyta and Polypodiophyta have been used by humans worldwide since ancient times, yet little has been documented. This paper analyzes and discusses the different uses of these plants in three Priority Terrestrial Regions (PTR) of conservation in the state of Oaxaca in Mexico. Our objectives were to: 1) document the traditional knowledge and uses...

In Mexico, the Gleicheniaceae family is represented by different species such as Dicranopteris flexuosa, Diplopterygium bancroftii, Gleichenella pectinata, Sticherus bifidus, S. brevipubis, S. palmatus and S. underwoodianus. Currently, few studies have described the gametophytes of some species in this family, and our objective was to contribute to...

The aim of this study was to determine the composition of the “spore rain” of ferns and lycopods in a cloud forest. We tested whether the canopy impedes spore dispersal to surrounding areas and how spore dispersal is affected by rainfall. The spores were captured with a modified Bush–Gosling trap placed at 30 cm above ground level in forested and n...

Con el objetivo de elaborar el listado florístico de los licopodios y helechos que habitan en el municipio de San Juan Colorado, área poco explorada y localizada en el distrito de Jamiltepec, Oaxaca, se realizaron diversos viajes de recolección durante los años 2012 a 2014. Como resultado del trabajo se registraron 15 familias, 33 géneros y 68 espe...

In Mexico, the Gleicheniaceae family is represented by different species such as Dicranopteris flexuosa, Diplopterygium bancroftii, Gleichenella pectinata, Sticherus bifidus, S. brevipubis, S. palmatus and S. underwoodianus. Currently, few studies have described the gametophytes of some species in this family, and our objective was to contribute to...

Huperzine A (Hup A), the alkaloid produced by the Chinese medicinal plant Huperzia serrata, has been documented to be a promising agent for the treatment of Alzheimer's disease due to its potent acetylcholinesterase inhibitory (AChEI) activity. The search for anticholinesterase natural products, as well as for alternative sources of Hup A in Mexica...

Isoetes tamaulipana, an aquatic plant that grows in small pools formed in outcrops of granitic rocks, and currently known only from the municipality of San Carlos in the state of Tamaulipas México, is described and illustrated. The new species is compared with taxa that are growing in similar environments conditions or have recently been described...

Se realizó el estudio palinológico de las esporas de Dicranopteris flexuosa, Diplopterygium bancroftii, Gleichenella pectinata, Sticherus bifidus, S. brevipubis, S. palmatus y S. underwoodianus, especies mexicanas de la familia Gleicheniaceae. El material fue recolectado en diversas localidades del país, las descripciones morfológicas se realizaron...

Con base en la revisión de material de herbario y literatura especializada, así como en la recolección de ejemplares botánicos, obtuvimos la información correspondiente a la riqueza, distribución por municipio, tipo de vegetación e intervalo altitudinal de los helechos y licofitos epífitos que habitan en el estado de Veracruz. Se registraron para e...

Based on the review of herbarium material and specialized literature, as well as recollection of botanical specimens, we obtained information about the species richness, municipal distribution, vegetation type and altitudinal range of epiphytic ferns and lycophytes that occur in the state of Veracruz, Mexico. We recorded 11 families, 33 genera and...

Las plantas son organismos generalmente autótrofos que nos proporcionan oxígeno, alimento y vivienda. Son la materia prima de distintos procesos industriales a través de los cuales se elaboran productos de uso común para nosotros (papel y medicamentos por ejemplo), además, son el eslabón primario de las distintas cadenas alimenticias, proporcionan...

ABSTRACT.—Although rain is the most important agent in airborne biological particle deposition most of the current sampling traps retain palynomorphs (fern spore, fungal spore, pollen, among others) but are unable to measure precipitation. The objectives of this study are to present a new simple pluviometric/gravimetric spore/pollen trap and propos...

Se presentan datos relativos a la morfología de las esporas de 36 especies de helechos y tres licofitas presentes en la localidad de Río Malila, municipio de Molango de Escamilla, en el estado de Hidalgo, México. Los taxa estudiados corresponden a 27 géneros y 14 familias. Las esporas de Ctenitis equestris, Elaphoglossum obscurum, Pecluma sursumcur...

Morphological characteristics of the spores of 36 species of ferns and three of lycophytes from Rio Malila, municipality of Molango de Escamilla, Hidalgo, Mexico, grouped into 27 genera and 14 families are provided. The spores of Ctenitis equestris, Elaphoglossum obscurum, Polystichum turrialbae, and Pecluma sursumcurrens are described for the firs...

Temperature determines the germination percentage and germination rate of non-dormant fern spores and is known to be a crucial factor for breaking or inducing dormancy in seeds. The objective of this study was to determine the effect of optimal, supraoptimal and suboptimal temperatures on spore germination of eight species of terrestrial homosporou...

Se reporta por primera vez a Onocleopsis hintonii para el estado de Hidalgo, México, adicionando el registro de la familia Onocleaceae Pic. Serm. Se presentan datos relativos a su morfología y las características de sus esporas.

Hechtia lanata L.B.Sm., a species known only from the southeastern region of Oaxaca, Mexico is neotypified and a complete and updated description is presented. Photographs of the species characteristics and habitat are also included.

RESUMEN Se presenta el catálogo de las epífitas vasculares del Bajío y de regiones ad-yacentes, se incluye una sinopsis numérica y un análisis de la representación de los taxa por grupo botánico, por distribución estatal y municipal, por tipo de vege-tación y por intervalo altitudinal. Se hace una comparación de los resultados con los obtenidos por...

Se presenta el catálogo de las epífitas vasculares del Bajío y de regiones adyacentes, se incluye una sinopsis numérica y un análisis de la representación de los taxa por grupo botánico, por distribución estatal y municipal, por tipo de vegetación y por intervalo altitudinal. Se hace una comparación de los resultados con los obtenidos por diversos...

This paper describes the development of the sexual phase of the invasive fern, Pteridium caudatum, from spore germination to young sporophyte formation. Spores samples for gametophyte cultures were taken from various sporophytes and then sown on mineral agar with Thompson's media. Gametophytes were maintained under fluorescent light on a 12h light,...

Morphology of the sexual phase of seven epiphytic taxa of Polypodium that grow in Mexico was observed and described. The spores of all species studied are monolete, ellipsoid to reniform, and verrucate to tuberculate. All the species analyzed have the Vittaria-type pattern of germination. In regard to the prothallial development, the Drynaria-type...

Morphology of the sexual phase of seven epiphytic taxa of Polypodium that grow in Mexico was observed and described. The spores of all species studied are monolete, ellipsoid to reniform, and verrucate to tuberculate. All the species analyzed have the Vittaria-type pattern of germination. In regard to the prothallial development, the Drynaria-type...

Se neotipifi ca y se presenta una descripción completa y actualizada de Hechtia lanata L.B.Sm., conocida únicamente del sureste de Oaxaca, México. Se incluyen asimismo fotografías que muestran las características de la especie y del hábitat en el que crece.

Tillandsia escahuascensis, a saxicolous species from the Cañón de Escahuasco, municipio de Tetela de Ocampo, Puebla, Mexico, is described and illustrated. The new taxon shares some similarities with T. parryi and T. suesilliae, but it is easily distinguished by its 2-3 branched inflorescences with very narrowly oblong to linear and long stipitate s...

Se describe e ilustra Aechmea aenigmatica López-Ferrari, Espejo, Ceja et A. Mendoza, una nueva especie de Oaxaca, México. El taxon aquí descrito se compara con A. lueddemanniana (K. Koch) Mez y con A. mexicana Baker, especies con características similares, de las cuales difiere por la presencia de sépalos simétricos y de pétalos sin apéndices basal...

A comparative analysis is presented of the spore morphology, germination pattern, and prothallial development of the sexual phase of seven species in the fern genus Phanerophlebia C. Presl. Gametophyte development was studied from samples grown both on agar and soil. Spores are monolete, ellipsoid, with light brown to dark brown perine; the germina...

Aechmea aenigmatica López-Ferrari, Espejo, Ceja et A. Mendoza, a new species from Oaxaca, Mexico is described and illustrated. The new taxon is compared with A. lueddemanniana (K. Koch) Mez and A. mexicana Baker, species with similar characteristics, from which it differs by the presence of symmetrical sepals and petals without basal appendages. Id...

Based on the recollection of botanical specimens in different regions of the state of Hidalgo and the study of herbarium material deposited in several institutional collections, supplemented by a literature review, we obtained records of 17 families (nine of them belonging to Pteridophytes and the rest to Angiosperms), 64 genera and 163 species. We...

This paper describes the morphology of the sexual phase and spores of Platycerium andinum and Platycerium wandae. Spores were sown in Thompson's media and the cultures were kept at 24-25 degrees C, with 12h light/darkness photoperiod. Developmental phases were fixed in FAA and processed for observation with the scanning electron microscope. Spores...

Based on the recollection of botanical specimens in different regions of the state of Hidalgo and the study of herbarium material deposited in several institutional collections, supplemented by a literature review, we obtained records of 17 families (nine of them belonging to Pteridophytes and the rest to Angiosperms), 64 genera and 163 species. We...

A comparative study of the gametophytes of eight Mexican species of the genus Blechnum (Blechnaceae) is described. Fertile plants for spore collection were obtained at different Mexican localities. The spores were sown in agar enriched with Thompson media and cultured at 22–25 °C, with a light regime of 12 hours. Spores of all species are monolete,...

A comparative study of the gametophytes of eight Mexican species of the genus Blechnum (Blechnaceae) is described. Fertile plants for spore collection were obtained at different Mexican localities. The spores were sown in agar enriched with Thompson media and cultured at 22-25 °C, with a light regime of 12 hours. Spores of all species are monolete,...

The prothallial development of gametophytes of Olfersia alata and Olfersia cervina (Dryopteridaceae) is described and compared. Spores are monolete, ellipsoid, and with broadly winged perispore. Germination is Vittaria-type and the prothallial development is Aspidium-type. Adult gametophytes are cordiform-spatulate to cordiform-reniform, with margi...

The development and morphology of the sexual phase of Pseudocolysis bradeorum (Polypodiaceae) are described from material collected in Finca La Selva, near Puerto Viejo, Province of Heredia, Costa Rica. Spores were sown in Thompson medium with agar (25 Petri dishes) and germinated after seven days; the germination pattern was Gleichenia-type and th...

Recibido: 02 de marzo de 2009 Aceptado: 16 de junio de 2009 Resumen El objetivo de este trabajo es dar a conocer las ca-racterísticas morfológicas, el hábitat y la distribu-ción del género Isoëtes para México, así como el estado de conservación de los hábitats donde cre-cen. Los taxa son plantas acuáticas o subacuáticas y las especies de este géner...

A comparative study of the gametophytes of eight Mexican species of the genus Blechnum (Blechnaceae) is described. Fertile plants for spore collection were obtained at different Mexican localities. The spores were sown in agar enriched with Thompson media and cultured at 22-25 °C, with a light regime of 12 hours. Spores of all species are monolete,...

The morphogenesis of the sexual phase of seven species of Thelypteris subg. Cyclosorus (Thelypteridaceae) is described and compared. Spores of all species are monolete, ellipsoid and have positive photoblastism. They have Vittaria-type germination, germinal filaments are short and uniseriate, and Aspidium-type development. Adult gametophytes are sp...

Nonvascular plants consist of three divisions, Antho- cerotophyta, Bryophyta and Marchantiophyta. The latter is characterized by having bilobulate game- tophytes with dorsiventral flattened symmetry; most of the species are terrestrial, however some of them have returned to the aquatic environment and are exceptionally interesting. This paper shows...

In Mexico, the Bromeliaceae are represented by all three subfamilies recognized by Smith & Downs (1974), with the genera Tillandsia, Pitcairnia and Hechtia being the largest. Hechtia with ca. 53 species (Espejo et al., 2004; Espejo et al. 2007; Luther, 2006), 49 of which occur in Mexico, and with 47 of these endemic, may be considered a Mexican gen...

Se presenta un panorama general de las principales características y adaptaciones de las plantas epífitas, así como de la diversidad e importancia del grupo en México.

The effects of light and temperature (constant and fluctuating) on fern spore germination in Tectaria heracleifolia, Tectaria incisa, Tectaria mexicana, and Tectaria transiens were studied using plastic filters or filters made from leaves, both of which reduced the red:far red ratio (R:FR) and photon flux density (PFD) in different magnitudes. Unde...

- Phanerophlebia macrosora (Baker) Underw. (Dryopteridaceae), new record for the Distrito Federal (Mexico) </table

RESUMEN En este trabajo se presenta un panorama general sobre los distintos usos que se les han dado a los heléchos y plantas afínes, en el mundo y en México a través de muchos años. Tradicionalmente los heléchos se han utilizado con fines ornamentales, medicinales, alimenticios, en la construcción y como sustrato de otras plantas y más recientemen...

sus dos progenitores Tectaria incisa (Morton, 1966) y Tectaria panamen-sis [ = Dictyoxiphium panamense Hook.] (Tryon y Tryon, 1981). En el caso de México este helecho se encuentra en el estado de Veracruz, aunque posiblemente también se dis-tribuya en los estados de Oaxaca y Chiapas. T. ×michleriana es un helecho ter-restre que mide de 1 a 1.5 m de...

Se describe la morfología de los gametofitos de Microgramma lycopodioides y Microgramma piloselloides. Ambas especies presentan esporas monoletes, germinación de tipo Vittaria y desarrollo protálico de tipo Drynaria. Sus gametofitos son cordiformeespatulados a cordiforme-reniformes, con desarrollo de escasos pelos unicelulares y pluricelulares en l...

A contribution to the study of the gametophyte's morphology and development of some species of Thelypteris Schmidel (Thelypteridaceae). The development and morphology of the sexual phase of five species of the Thelypteridaceae family is described and compared. Spores were sown in Thompson medium with agar, germination occurred after 11 days; all sp...

Spores of Dryopteris munchii were sown in pots with three types of soil, which had differences in physical and chemical properties. The objective was to investigate the effect soil type in the formation of apogamous sporophytes. Laboratory controlled moisture and artificial light conditions were provided for seven months. The number of gametophytes...

The results of morphogenesis studies of the sexual phase of Odontosoria schlechtendalii and O. scandens are presented in this paper. In O. schlechtendalii and O. scandens the spores are triletes, non-chlorophyllous, and germinación is of the Vittaria-type, devoid of perine, the exine is smoth and sometimes coarsely ridged to reticulate. The develop...

The results of morphogenesis studies of the sexual phase of Odontosoria schlechtendalii and O. scandens are presented in this paper. In O. schlechtendalii and O. scandens the spores are triletes, non-chlorophyllous, and germinación is of the Vittaria-type, devoid of perine, the exine is smooth and sometimes coarsely ridged to reticulate. The develo...

The development and morphology of the gametophytes of seven species of ferns from genus Pleopeltis are described and compared. The spore germination is Vittaria-type in P. astrolepis, P. crassinervata, P. macrocarpa, P. polylepis and P. revoluta. For P. angusta and P. mexicana it was proposed a new germination pattern is Pleopeltis-type. The protha...

the development and morphology of the gametophytes of seven species of ferns from genus Pleopeltis are described and compared. The spore germination is Vittaria-type in P. astrolepis, P. crassinervata, P. macro- carpa, P. polylepis and P. revoluta. For P. angusta and P. mexicana it was proposed a new germination pattern is Pleopeltis-type. The prot...

Se hace un análisis de la morfología de las plantas y de las fuentes que son importantes para hacer interpretaciones morfológicas, asimismo se analizan los trabajos publicados en este campo en la Revista de Biología Tropical desde su fundación, y su aporte al desarrollo de la morfología vegetal en la región neotropical.An analysis on plant morpholo...

An analysis on plant morphology and the sources that are important to the morphologic interpretations is done. An additional analysis is presented on all published papers in this subject by the Revista de Biología Tropical since its foundation, as well as its contribution to the plant morphology development in the neotropics.

The development of the sexual phase of six Mexican species of Dryopteris is described and compared. Spores of all studied species are monolete, ellipsoid and have a rugose surface; the perine is folded, brown to dark brown, with a tubercled outline. Germination pattern is of the Vittaria-type and the development pattern of the prothallia is of the...

The development and morphology of the sexual phase of Pseudocolysis bradeorum (Polypodiaceae) are described from material collected in Finca La Selva, near Puerto Viejo, Prov-ince of Heredia, Costa Rica. Spores were sown in Thompson medium with agar (25 Petri dishes) and germinated after seven days; the germination pattern was Gleichenia-type and t...

Se describe e ilustra Pellaea ribae Mendoza & Windham, una nueva especie de Pellaea sect. Pellaea la cual se distingue claramente de otros representantes del género por sus abundantes tricomas blanquecinos presentes en el pecíolo, en el raquis y en la superficie abaxial de la lámina. Hasta ahora P. ribae se conoce solamente de dos localidades en Sa...

The development and sexual phase characteristics of Llavea cordifolia, a genus that is monotypic to México, Guatemala and Costa Rica.The spores were collected from Veracruz and Puebla, the culture was in vitro on the basis of gametophyte population growing in petri dishes. Spore germination is of the Vífíana-type, result-ing in a uniseriate gametop...

The development and sexual phase characteristics of Llavea cordifolia, a genus that is monotypic to Mexico, Guatemala and Costa Rica. The spores were collected from Veracruz and Puebla, the culture was in vitro on the basis of gametophyte population growing in petri dishes. Spore germination is of the Vittaria-type, resulting in a uniseriate gameto...

Spore morphology and sexual fase development of Arachniodes denticulata (Sw.) Ching are described from material collected in states of Hidalgo, Oaxaca and Veracruz, Mexico (one sample from each locality). The spores were sown in Thompson medium with agar (30 Petri dishes). The spores are monolete, with perine, ellipsoid in shape and non chlorophyll...

Spore morphology and sexual fase development of Arachniodes denticulata (Sw.) Ching are described from material collected in states of Hidalgo, Oaxaca and Veracruz, Mexico tone sample from each locality). The spores were sown in Thompson medium with agar (30 Petri dishes). The spores are monolete, with perine, ellipsoid in shape and non chlorophyll...

The development of the sexual phase of six Mexican species of the fern Dryopteris is described and compared. The spores of all six species are monolete, ellipsoid, the perine is folded, brown to dark brown, with a tubercled outline. The germination pattern of the species is Vittaria-type and the development pattern of the prothallia is Aspidium-typ...

The development of the gametophytes of Lygodium heterodoxum Kunze and Lygodium venustum Sw. is described on the basis of spores collected in the States of Veracruz and Sinaloa, México. The germination of the spores is of the Vittaria-type or Lygodium-type. Prothallial development is of the Adiantum-type with transition to Ceratopteris-type. The gam...

Sexual phase development was studied in Didymochlaena truncatula, on the basis of spores collected in Península Moreno and Tebanca, Catemaco, Veracruz, México. The spores are monolete, ellipsoid, with perine, and non-clorophyllic. The germination pattern is of the Vittaria-type and the prothallial development is of the Adiantum-type, the adult game...

The development of the gametophytes of Lygodium heterodoxum Kunze and Lygodium venustum Sw. is described on the basis of spores collected in the States of Veracruz and Sinaloa, Mexico. The germination of the spores is of the Vittaria-type or Lygodium-type. Prothallial development is of the Adiantum-type with transition to Ceratopteris-type. The gam...

Sexual phase development was studied in Didymochlaena truncatula, on the basis of spores collected in Peninsula Moreno and Tebanca, Catemaco, Veracruz, Mexico. The spores are monolete, ellipsoid, with perine, and non-clorophyllic. The germination pattern is of the Vittaria-type and the prothallial development is of the Adiantum-type, the adult game...

A comparison was made of the gametophytic development of Phlebodium araneosum, P. pseudoaureum and P. decumanum. Spores were collected from several Mexican localities ranging in altitude from 30 to 2300 m and sown on agar with mineral salts. Similarities in germination type and prothallial development were observed. Adult gametophytes are cordate-s...

En la actualidad gracias a la avanzada tecnología en microscopía, hemos podido conocer más acerca de los secretos de la naturaleza, en esta ocasión nos re-feriremos al reino vegetal y en particular a las dimi-nutas plantas conocidas como protalos o gametofi-tos de heléchos. En el presente artículo hemos querido enfatizar so-bre la diversidad morfol...

The development and morphology of the gametophytes of the fern L quadripinnata var. contracta are described from material collected in Robinson Crusoe Island (Juan Fernandez Archipelago, Chile). The spores were sown in Thompson médium (25 Petri dishes). Spore dormancy range was 15-20 days. germination pattern is Cyathea-type and the prothallial dev...

The development and morphology of the gametophytes of the fern L. quadripinnata var. contracta are described from material collected in Robinson Crusoe Island (Juan Fernandez Archipelago, Chile). The spores were sown in Thompson medium (25 Petri dishes). Spore dormancy ranee was 15-20 days, germination pattern is Cyathea-type and the prothallial de...

Desarrollo del gametofito y del esporofita joven de Niphidium crassifolium (Filicales: Polypodiaceae s. str.) Abstract: The germination pattem of N. crassifolium is Vittaria-type. The prothallial development is Drynaria-lype. Young prothalli are spatulate and naked, prothalli reach maturity about 80 days after the spore germination, with the differ...

The results of morphogenetic studies of the sexual phase of Blechnum chítense and B. cycadifolium are presented in this paper. In both species the spores are monolete, ellipsoidal, non-chlorophyllous, and the germination is of the Viltaria-lype. The development pattern of the prothal lia is of the Aspidium-type in B. cycadifolium for the unicellu-l...

The dormancy of spores oí Lophosoria quadripinnata ranges from 8 to 12 days; the germination pattern is of the Cyathea-type and the prothallial development is of the Adiantum-type. Five-celled antheridia were observed after 72 days and the basally-located archegonia appeared after 270-285 days. The adult gametophytes are isodiametri-cal, short-wing...

heléchos son plantas criptógamas (plantas sin flores) vasculares que forman parte de las pterido-fitas. Se desarrollaron en el período Devónico, ha-ce aproximadamente 400 millones de años y aun-que gran número de especies se extinguieron duran-te el Carbonífero, muchas otras especies han sobre-vivido hasta nuestros días. Se considera que existen al...

La germinación de las esporas y el desarrollo del gametofito laminar de Thelypteris rhachiflexuosa Riba siguen el patrón general mencionado en la bibliografía para otras especies del género; la germinación es del tipo Vittaria y el desarrollo laminar es del tipo Drynaria. Desde temprana edad se observan pelos unicelulares, cortos, capitados, glandu...

The morphogenic process of the gametophyte Metaxya rostrata is characterized by: a) germination of the Vinaria-type, b) development of a short initial filament, c) the early beginning of the laminar atage, and d) the early replacement of the initial meristematic by a pluricclhllar meristem, which corresponds to the Asdiantum-type develop-ment. The...