S. Robbert Gradstein

S. Robbert Gradstein
Meise Botanic Garden

PhD

About

475
Publications
231,375
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14,521
Citations
Citations since 2016
158 Research Items
7181 Citations
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201620172018201920202021202202004006008001,0001,200
201620172018201920202021202202004006008001,0001,200
Introduction
Robbert Gradstein (born 1943) is a Dutch botanist who works at Meise Botanic Garden, Belgium, as a honorary research associate. He is a retired professor of botany and director of the botanical garden at the University of Göttingen. His research interests include taxonomy and biogeography of tropical bryophytes, especially liverworts. His current research focuses on the flora of Central Africa.

Publications

Publications (475)
Book
This handbook provides keys, descriptions and illustrations for the 850 species of liverworts and hornworts recorded from Colombia and Ecuador (148 genera, 47 families). The largest genera are Lejeunea (66 spp.), Plagiochila (65), Frullania (54), Radula (33), Metzgeria (33), Cololejeunea (32), Cheilolejeunea (30), Bazzania (26), Drepanolejeunea (25...
Article
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Plagiochila (Dumort.) Dumort. is one of the largest liverwort genera of Madagascar. A study of the rich Plagiochila holdings from Madagascar kept in the herbaria of Brussels, Eger and Paris leads to the recognition of 22 species, in six sections. One species, P. vandenberghenii Gradst., sp. nov., is new to science and P. bifaria (Sw.) Lindenb., P....
Article
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Abstract Tropical forests are highly diverse at many spatial scales. In these forests, small- sized canopy organisms can form species- rich communities already within a few cm2. Understanding how species numbers increase when expanding the sampling along the tree and the forest is critical for evaluating the processes maintaining biodiversity. We t...
Article
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Tropical lowland cloud forests (LCF) are only reported from French Guiana but may be widespread in the tropics. They are botanically distinguished from lowland rain forest (LRF) based on the diversity and composition of epiphyte communities in the forest canopy. To facilitate the detection of LCF, reliable ground-level indicators are needed. A firs...
Article
A taxonomic study of the Radulaceae from Madagascar leads to the recognition of thirteen species, in five subgenera. Radula evelynae, R. lindenbergiana and R. retroflexa are new to Madagascar, R. fulvifolia is excluded from the Madagascan flora and R. javanica is considered a doubtful record. Radula ankefinensis is a new synonym of R. mexicana and...
Article
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Volatile emissions from 22 bryophyte species from Peninsular Malaysia were collected using a dynamic headspace technique and analyzed by gas chromatography-mass spectrometry (GC-MS). Thirty organic compounds (VOCs) from eight different groups were detected in bryo-phytes from the montane forest in Cameron Highlands and the lowland dipterocarp fores...
Article
Radula pallens var. marginata and R. smithii (subg. Volutoradula) are newly described from montane forests of Venezuela and Peru, respectively. Both taxa stand out by the presence of bordered leaf lobes. The new variety differs from R. pallens var. pallens in its narrow leaf border of one row of colorless cells with bulging trigones, while R. smith...
Article
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Eighty-fve species of liverworts and one hornwort are reported from Barro Colorado Island, Panama. About 80% of the species are Lejeuneaceae, refecting the predominance of members of this family in tropical lowland regions. Most of the species have wide neotropical or pantropical distributions. One species, Lejeunea tamasii, is only known from Barr...
Article
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Identifcation of Aneuraceae from the West Indies is a challenge as a modern taxonomic treatment for the Caribbean is lacking. Here we present a revision of the species from Guadeloupe and Martinique using an integrative, morphological and molecular approach. We recognize seven species of Riccardia, R. chamedryfolia (With.) Grolle, R. fucoidea (Sw.)...
Article
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An updated checklist of the liverworts and hornworts of Malaysia accepts 773 species and 31 infraspecific taxa of liverworts, in 120 genera and 40 families, and 7 species of hornworts (6 genera, 3 families). The largest family is Lejeuneaceae with 312 species in 30 genera, accounting for 40% of the total number of species. The largest genera are Co...
Article
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A collection of bryophytes from Uei tepui in Mount Roraima National Park, Roraima state, northern Brazil, yielded 45 species, in 25 genera and 15 families. Twenty four species are new to state of Roraima, of which seven are new to the Brazilian Amazon domain and six species are new to Brazil: Colura rhynchophora Jovet-Ast, Frullania mirabilis J.B.J...
Article
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A molecular-phylogenetic study (Gradstein & al. 2006) showed that Metzgeriopsis is nested in Cololejeunea.The generic name Metzgeriopsis, containing a single species, M. pusilla (= Cololejeunea metzgeriopsis), is four years older than the generic name Cololejeunea. Accepting the priority of Metzgeriopsis would require the transfer of several hundre...
Article
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Marchesinia cruegeriana was originally described based on material from Trinidad (leg. Crüger) and from Petrópolis, Brazil (leg. Rudolph, leg. Ule). The two collections from Petrópolis are present in BM and G, but the material from Trinidad, which was illustrated by Stephani in his Icon. Hepat. and should therefore be selected as the lectotype,...
Presentation
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Robbert Gradstein was born in The Netherlands in 1943. He attended the University of Utrecht where he obtained a Ph.D. in botany in 1975 on his dissertation "A taxonomic monograph of the genus Acrolejeunea (Hepaticae)". He has been on the teaching staff in the Botany Department of the University of Utrecht since 1969 and has been a Curator of the H...
Article
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Rudolf M. Schuster was one of the leading hepaticologists of the 20th century. His classification of the liverworts has been the standard one for many years and his manual of eastern North America is the largest and most beautifully illustrated hepatic Flora that has ever been published. He was a great explorer and made immense contributions to our...
Book
Full-text available
This book provides keys, descriptions and illustrations for the 124 genera and 43 families of liverworts and hornworts recorded from Malaysia. A few additional genera, found in neighboring countries but not yet in Malaysia, have also been included in the keys. Inquiries concerning orders should be addressed to: Hattori Botanical Laboratory, Obi 6–...
Book
Full-text available
This book provides keys, descriptions and illustrations for the 124 genera and 43 families of liverworts and hornworts recorded from Malaysia. A few additional genera, found in neighboring countries but not yet in Malaysia, have also been included in the keys. Inquiries concerning orders should be addressed to: Hattori Botanical Laboratory, Obi 6–1...
Book
TAXREF is the taxonomic register for all living organisms from metropolitain and overseas France, marine as well as continental. A new version is published each year. This 15th version can be downloaded here : https://inpn.mnhn.fr/telechargement/referentielEspece/taxref/15.0/menu
Article
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New findings of bryophytes are presented
Preprint
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This book is the first illustrated guide to the genera of liverworts and hornworts recorded from Malaysia. The work provides keys, descriptions, illustrations, distribution, habitats, and literature references for 124 genera in 43 families. The book is published by the Hattori Botanical Laboratory, Japan, and will appear in December 2021.
Article
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Mount Roraima, at the geographical tripoint of Brazil, Guyana and Venezuela, is famous for its richness in rare and endemic species. Here we report two unusual ramicolous liverwort species from the north ridge of the mountain, located within the borders of the country of Guyana: Frullania (sect. Microphyllae) trigona and Metzgeria deniseana sp. nov...
Article
An unusual specimen of the genus Ptychanthus (Lejeuneaceae) was collected in Xizang, differing from the common P. striatus in the perianth, having only five, wing-like keels (one dorsal, two lateral and two ventral), the lateral and ventral keels being sharper than the dorsal one. Molecular-phylogenetic analysis of chloroplast and nuclear DNA seque...
Article
Fog-driven epiphyte-rich tropical cloud forests were long believed to be restricted to mountainous regions. Recent studies have shown the occurrence of such forest types in the lowlands of French Guiana, where early morning radiation fog was shown to modify the water and energy cycles at the canopy level of the tropical lowland rain forest (Gehrig-...
Article
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A revision of herbarium materials of Cheilolejeunea choachina (Gottsche) Gradst. revealed that most collections belong to C. acutangula (Nees) Grolle or C. lobulata (Mont.) Gradst. & C.J.Bastos, some to C. laevicalyx (J.B.Jack & Steph.) Grolle. As the type material of C. choachina is lost, an illustration of the type in the Icones Hepaticarum of F....
Article
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Masami Mizutani was one of the foremost bryologists of Japan and an international authority on Lejeuneaceae. He has enriched our scientific knowledge with many original ideas and novel discoveries.
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Noteworthy new records of 48 species of mosses and liverworts, with notes on their taxonomy, distribution and ecology
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The number of available liverwort fossils has substantially increased within the past decade mainly due to new findings from Cretaceous and Cenozoic amber deposits. Here, we present a list of the fossil species that we consider suitable for calibrating phylogenetic reconstructions, along with brief descriptions, justification of their use, and age...
Article
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The number of available liverwort fossils substantially increased within the past decade, which is mainly due to new findings from Cretaceous and Cenozoic amber deposits. Many of them, however, are fragmentary and not predestined for consideration in evolutionary analyses. here, we list those liverwort fossils that we suggest as suitable for calibr...
Article
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The International Association of Bryologists (IAB) has been close to my heart during half of a century. Following the establishment of the IAB at the International Botanical Congress in Seattle in 1969, I served as its first secretary-treasurer for eighteen years and helped setting it up. Now, a half-century later, it is a joy and great satisfactio...
Article
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The Amazonian rain forests of Yasuni National Park, Ecuador (YNP), count among the world's forests regions with highest biodiversity, but are strongly threatened by deforestation. Cryptogams (bryophytes and lichens) are common and characteristic organisms in these forests, are sensitive to environmental changes, and are considered effective ecologi...
Article
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A broad range of climatic and biogeographical conditions are represented in the French Overseas Territories, from sub-polar to equatorial, resulting in a high diversity of endemic species. We mobilized data from herbaria, floras, checklists, literature, the expertise of botanists and plant ecologists to compile the most complete dataset on endemic...
Article
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The present publication is the first modern catalogue of the liverworts and hornworts of French Polynesia and accepts 161 species of liverworts and 5 species of hornworts. In addition, 40 species are doubtful records of French Polynesia and 45 species are excluded. The checklist is mainly based on a compilation of published records; a few unpublish...
Article
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The is the first modern catalogue of the liverworts and hornworts of French Polynesia and accepts 161 species of liverworts and 5 species of hornworts. The list is based on a compilation of all published records; in addition, 25 new species records from Moorea are included. The region has been explored very unevenly and several islands of considera...
Article
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Drepanolejeunea clavicornis and D. friesii were previously synonymised with D. physaefolia or all of them with D. vesiculosa . In the meantime, Drepanolejeunea vandenberghenii was described from the same species group, as new. In this paper many African specimens are compared with the original descriptions of the above species. Morphological invest...
Article
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This paper presents a brief assessment of the achievements of the International Association of Bryologists during the half-century of its existence. Fruitful international collaboration remains a challenge that requires active communication, creativity, friendship, flexibility and enthusiasm.
Article
We describe Pycnolejeunea apiculata sp. nov. from New Caledonia, being the third species in the genus known from NC. The new species resembles the rare Malesian P. cavistipula (Steph.) Mizut., but differs in the frequently apiculate leaf apex, the very wide angle between keel and ventral leaf margin, the incurved lobule free margin, and the longer...
Book
Full-text available
The urge to organise the world around us is an essential part of human nature. Naming and categorising enable us to store and access information ef ciently. The need to name and categorise extends to the natural world and, in particular, to living organisms. The science underpinning this area of knowledge is called Taxonomy, and is as old as humani...
Article
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La especie Pleurozia paradoxa es una hepática de hábitat generalmente paramuno que se encuentra en estado vulnerable según el libro rojo de briófitas de Colombia debido a su poca presencia y su minúscula área de ocupación en el país. Mediante la aplicación de modelos de distribución de especies podemos estimar áreas de idoneidad que dan cuenta de l...
Article
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The liverwort and hornwort flora of Ecuador is still very incompletely known. We report three species new to Ecuador (Lejeunea rionegrensis Steph., Notothylas javanica (Sande Lac.) Gottsche, Riccia vitalii Jov.-Ast) and 38 new to the province of Morona Santiago based on our fieldwork in the surroundings of Gualaquiza, Morona Santiago, in 2019. The...
Article
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The Polylepis forests of the high Andes host a unique biodiversity of plants and animals, yet are widely being destroyed by fire and cattle grazing and are considered as one of the most threatened ecosystems of South America. We inventoried liverwort and hornwort diversity in seven Polylepis sericea stands in the Andes of Venezuela (Sierra Nevada N...
Article
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Thysananthus weiweianus N.-N. Yu & Gradst. (Lejeuneaceae), a new fossil liverwort species in Dominican amber, is described and illustrated. The new species most closely resembles T. plicatiflorus, but differs in the larger lobules, autoicous sexuality and somewhat expanded keels and plicae of the perianth.
Article
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A taxonomic study of the liverwort genus Radula in Brazil based on morphological characters and on examination of types and over 1000 additional collections, leads to the recognition of 31 species and two varieties. A key to all species as well as descriptions, illustrations and comments on recognition, distribution and habitat of the recognized sp...
Data
this is a better scan of our Myriocolea paper, with the pages not upside down!
Chapter
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The greening of our planet is a fascinating story. The vast majority of the Earth's biomass is produced by plants, ranging from microscopically small phytoplankton to complex rainforest ecosystems. The evolution of plants can be traced back to the Archean and is intrinsically connected with the evolution of the Earth's geosphere and atmosphere.
Article
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The Guadeloupe archipelago has a rich bryophyte flora with 633 species, including 19 species reported as endemic to Guadeloupe. However, a critical examination of the types and literature shows that Guadeloupe has only 3 confirmed endemic species, Frullania trigona, Riccardia innovans and Trichosteleum glaucinum. The remaining "endemic" species are...
Article
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Cheilolejeunea is one of the largest genera of Lejeuneaceae and is widely distributed in tropical and subtropical regions. We present a taxonomic revision of the genus in Tropical America. Fifty-four species and six varieties are recognized, in seven sections; the number of accepted neotropical species is reduced about 20 percent. A key to neotropi...
Preprint
Full-text available
THE LIVERWORTS AND HORNWORTS OF COLOMBIA AND ECUADOR provides keys, descriptions and illustrations for about 850 species of liverworts and hornworts. The largest genera are Lejeunea (66 spp.), Plagiochila (65), Frullania (55), Radula (33), Metzgeria (33), Cololejeunea (32), Cheilolejeunea (30), Bazzania (26), Drepanolejeunea (25), Ceratolejeunea (1...
Article
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Gradstein, S.R. (2020): Checklist of the Liverworts and Hornworts of Ecuador. Frahmia 17:1-40. 706 species of liverworts and 16 of hornworts are reported from Ecuador; twenty species are listed as doubtful. Endemism in the country is about 6%. For each accepted species, distribution within the country (by province) and elevational range is given. T...
Article
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Polylepis forests are the world’s highest forests in terms of elevation and host a unique biodiversity of plants and animals. Unfortunately, these forests are rapidly disappearing due to human impact and are one of the most threatened ecosystems of South America. This paper deals with liverwort diversity in Polylepis forests of Ecuador. Liverworts...
Article
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Frullania subg. Frullania (= subg. Thyopsiella) is a little-known group of liverworts in the Neotropics, being represented by only two species. Both are members of the subsect. Microphylla characterized by very small, dioicous plants, ocellate leaves, caducous leaf lobes and very small, distant underleaves. Here we describe and illustrate a third n...
Article
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Spruceanthus planifolius, a rare species previously known only from Japan and Korea, is reported here for the first time from China. This species is characterized by the large leaf lobules ca. 1/2 as long as leaf lobes, the lobule with one tooth, and the lobular tooth 3–4 cells long and 2–3 cells wide at base. Detailed description and illustrations...
Article
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In the course of a taxonomic study of Radula in Brazil, a new species from Bahia and a new variety of R. fendleri from Rio de Janeiro were detected. The new species is characterized by plants irregularly pinnate, leaves oblong-ovate with entire to sinuate margins, cell walls with small trigones at leaf base and midleaf, increasing in size toward th...
Article
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Lejeunea is one of the largest genera of liverworts in the Neotropics and probably the largest liverwort genus in Brazil. We present the first treatment of Lejeunea for Brazil, and for any major part of the Neotropics. Fifty eight species and three varieties are recognized. A key to the Brazilian species of Lejeunea is provided and each species is...
Article
Full-text available
We present the first treatment of Lejeunea for Brazil, and for any major part of the Neotropics. Fifty-eight species and three varieties are recognized. A key to the Brazilian species of Lejeunea is provided and each species is briefly described with data on geographical distribution, habitat, differentiating characters and affinities, and referenc...
Article
Full-text available
Tropical America is a major center of diversity of Lejeuneaceae. A synthesis of the neotropical genera of Lejeuneaceae was published in 2001. Since then, many changes have occurred in the systematics of neotropical Lejeuneaceae: generic relationships were disentangled using molecular methods, new genera were recognized and others reduced to synonym...
Article
Lowland tropical bryophytes have been perceived as excellent dispersers. In such groups, the inverse isolation hypothesis proposes that spatial genetic structure is erased beyond the limits of short‐distance dispersal. Here, we determine the influence of environmental variation and geographic barriers on the spatial genetic structure of a widely di...
Article
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El Parque Nacional Podocarpus (PNP) se encuentra ubicado en los Andes australes del Ecuador y el Oriente Amazónico, entre las provincias de Loja y Zamora Chincipe, en un rango altitudinal de 960 a 3.800 m y una superficie de 146.280 ha. El Parque es considerado una de las tres zonas núcleo de la Reserva Podocarpus-El Cóndor, siendo clave para la co...
Chapter
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This is a review of current knowledge of various aspects of tropical bryophyte ecology, illustrated by numerous color pictures.
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A comparison of the goals and activities of the bryological societies of the world
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On 4 March 2006 a bust of Richard Spruce (1817-1883) was unveiled at Río Verde near Baños, Ecuador. The work of art, fashioned by the Ecuadorian sculptor Edguin Barrera and generously supported internationally by various institutions, organizations and individual donors, honours the pioneering work of this great botanist on the rich Amazonian and A...
Conference Paper
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La diversidad de briofitas es muy alta en selvas tropicales, donde se las encuentra sobre todo como epífitas en diferentes hábitats. Por sus características poiquilohídricas, estas plantas reaccionan en forma muy sensible a las variaciones ambientales y son por lo tanto adecuadas como bioindicadoras de condiciones ecológicas. Nuestros estudios brio...
Article
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A taxonomic revision of the liverwort family Aneuraceae in eastern Africa is presented based on the results of an integrative approach. Molecular and morphological data lead to the recognition of fourteen species in eastern Africa, in three genera: eleven species in Riccardia Gray, two in Aneura Dumort. and one in Afroriccardia Reeb & Gradst. One f...
Article
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The rare neotropical liverwort Plagiochila eggersii Inoue was detected new to Brazil in Serra da Jiboia, Bahia. A brief note on the species along with comments on its occurrence in Brazil and geographic distribution are provided.
Article
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A taxonomic revision of the liverwort family Aneuraceae in eastern Africa is presented based on the results of an integrative approach. Molecular and morphological data lead to the recognition of fourteen species in eastern Africa, in three genera: eleven species in Riccardia Gray, two in Aneura Dumort. and one in Afroriccardia Reeb & Gradst. One f...
Article
Full-text available
Western Melanesia is the richest area worldwide in terms of species diversity in Lejeuneaceae subfamily Ptychanthoideae. This paper provides keys, descriptions and illustrations for all the genera and species recorded from Western Melanesia. The nomenclature of the species is in part outdated and has been corrected in this pdf version (as of Decemb...
Preprint
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23 species of Plagiochila are reported from Madagascar, together with a key to species and varieties, and data on types, synonymy, distribution, habitat and selected specimens. Plagiochila bifaria and P. macrostachya are new to Africa, P. strictifolia is new to Madagascar and the occurrence of P. boryana, P. paucidentata, P. simplex and P. squamulo...
Article
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Bryophytes are an important component of paramo in terms of diversity and biomass as well as the functioning of paramo ecosystems. These poikilohydric organisms are very sensitive to microclimate changes related to humidity and light availability. We studied the influence of climate and topography on the diversity of terrestrial bryophytes in three...
Data
Color images of selected mosses, liverworts and hornworts of Podocarpus National Park, southern Ecuador
Preprint
Full-text available
Tropical America is a major center of diversity of Lejeuneaceae. A synthesis of the neotropical genera of Lejeuneaceae was published in 2001. Since then, many changes have occurred in the systematics of neotropical Lejeuneaceae: generic relationships were disentangled using molecular methods, new genera were recognized and others reduced to synonym...