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Attempted crosses between Aglaothamnion strains from Europe and the American east coast; culture numbers are as in Table I
Source publication
Reinstatement of the genus Aglaothamnion Feldmann-Mazoyer (Rhodophyta, Ceramiales) for species of Callithamnion with only one nucleus in each vegetative cell is proposed. -from Authors
Context in source publication
Context 1
... the basis of morphological com parisons and crossability tests, we are inclined to believe that the American isolate and the Nor wegian Papperhavn isolate are conspecific, whereas A. feldmanniae is similar but probably a distinct species. All attempted crosses between A. feldmanniae and the two related isolates from the American east coast and Norway have in dicated that a sterility barrier exists, whilst cross es between the American and Norwegian isolates were positive ( Table 2). Kornmann & Sahling (1983) boergesenii and an isolate of A. byssoides from Sweden used in the present study ( Table 1) further isolates should be investigated before a conclusion is reached. ...
Citations
... The separation of the two genera, into monophyletic genera, based on the presence of a single nucleus per cell in Aglaothamnion as opposed to multi-nucleate Callithamnion (L`Hardy- Halos & Rueness 1990) has not been well tested. A previous study suggested that while it was possible that Callithamnion may be monophyletic, this made Aglaothamnion paraphyletic (McIvor et al. 2002). ...
The genus Aglaothamnion has been separated from Callithamnion based on several characters, most notably the presence of a single nucleus per cell in Aglaothamnion versus multi-nucleate Callithamnion. Few studies have investigated whether these genera are genetically monophyletic. Several species of Aglaothamnion have been reported from Korea, but no phylogenetic studies have been conducted on them. We collected a specimen resembling the genus Aglaothamnion from the east coast of Korea, which is characterized by alternate branching, long axial cells and uninucleate cells. Phylogenetic analyses using rbcL sequences and two DNA-based species delimitation analyses revealed that this specimen is a new species closely related to A. pseudobyssoides. Morphologically, the new species was distinguished by longer axial cells and shorter determinate branches compared to A. pseudobyssoides. The new specimen did not show any reproductive features. Our new species and A. pseudobyssoides are distantly related to other sequences used in the analysis. Our phylogenetic analyses, using our samples and sequences deposited in Genbank, suggests that the named genera, Callithamnion and Aglaothamnion, are not monophyletic, or that the samples were incorrectly named before being submitted to Genbank. While the taxonomy of these two genera requires further analysis, with more markers and type specimens sequenced, it is clear that our new sample is a distinct genetic species. Therefore, we propose the establishment of a new species of Aglaothamnion from Korea, Aglaothamnion inkyui sp. nov.
... );Brasileiro et al. (2009);Cordeiro-Marino (1978);Dixon and Price (1981);Guimarães (2006); L'Hardy-Halos andRueness (1990);Maggs et al. (1991);Rueness and L'Hardy-Halos (1991);Rueness and Rueness (1980);Schneider (1980);Searles (1981);Wynne (2005) Figs 29-37.Fig. 29. ...
Taylor's (1960) floristic treatment of the benthic marine algae of the tropical and subtropical western Atlantic and Wynne's (2011) "checklist: third revision" serve as benchmarks in a review of changes made in the past half-century period. There has been a great increase in the number of recognized taxa of red, brown and green algae at all taxonomic ranks: from 758 to 1,393 species, an increase of 84%; from 231 to 406 genera, an increase of 75%; and from 63 to 106 families, an increase of 68%. In regard to recognized infraspecific taxa, the increase was less dramatic, from 140 to 185, thus a 32% change in the 50-year period. This review addresses the question: What factors were responsible for this proliferation of taxa that are now recognized in this domain of the tropical and subtropical western Atlantic? The answer is that many reasons contributed to these changes. Foremost among these causes have been the advances in gene-sequencing technologies. Revised phylogenetic relationships have led to many genera being divided into more than one genus, as well as new families and orders being delineated. Numerous examples of cryptic species have been discovered by gene-sequence and DNA-bar coding studies. This trend is depicted by case studies. Examples of genera being divided are Galaxaura, Liagora and Laurencia. Tricleocarpa and Dichotomaria have been segregated from Galaxaura. Trichogloeopsis, Ganonema, Izziella, Yamadaella, and Titanophycus have been segregated from Liagora. Chondrophycus, Osmundea, Palisada, and Yuzurura have been segregated from Laurencia. Examples are given of other genera present in this region of the western Atlantic that have been split up. Many genera have increased in terms of the number of species now assigned to them. Taylor's (1960) treatment recognized only two species in Hypoglossum, whereas Wynne's (2011) checklist contained a total of 9 species of Hypoglossum. Taylor's account included only two species of Botryocladia, but this number had grown to 15 in Wynne's checklist. Examples of new genera and species occurring in the region of the western Atlantic are given, and examples of taxa being newly reported for this domain are provided. An increase in the number of phycologists in Latin and South America, exploration of previously unexplored regions, and the increasing use of SCUBA for collecting and at greater depths have all contributed to the increase in the number of algal taxa that are now recognized as occurring in the tropical and subtropical western Atlantic.
... B.-A. #698: BM, NY, US) reveals that these algae are uninucleate throughout. Following the conclusion of L'Hardy-Halos and Rueness (1990) and L'Hardy-Halos and Maggs (1991)-that nuclear condition is the only valid generic character that would separate Aglaothamnion from Callithamnion-we propose the following combination. ...
... Based on similarities in reproductive and vegetative morphological data provided by Schneider and Searles (1991), we conclude that their material should also be referred to A. halliae. Callithamnion pseudobyssoides P. et H . Crouan, an eastern Atlantic species, was considered by L'Hardy-Halos and Rueness (1990) to be distinct from C. byssoides sensu Edwards (1969Edwards ( , 1970. ...
Specimens from the exsiccatae Phycotheca BorealiAmericana number 698 are shown to represent two distinct species. One of them, formerly known as Callithamnion halliae, is transferred to Aglaothamnion on the basis of its uninucleate cells. The specimens exhibit distichous branching and are ecorticate. A lectotype is proposed for one of the P.B.-A. #698 specimens displaying these characters. Aglaothamnion halliae (Collins) comb. nov. is an earlier name for Aglaothamnion westbrookiae Rueness et L'Hardy-Halos. The second species, together with specimens of P.B.-A. #1896, has radial branching and corticated axes and is described herein as a new species, Aglaothamnion collinsii. The binomial Aglaothamnion boergesenii (Aponte et Ballantine)L'Hardy-Halos et Rueness in Aponte, Ballantine, et J. Norris is validated. A key to the tropical and warm-temperate western Atlantic species of Aglaothamnion is presented.
... Aglaothamnion halliae was first recorded from Norway in 1980, and has later been observed a few times in the Oslofjord (L'Hardy-Halos and Rueness 1990, Larsen 1995. ...
... Aglaothamnion halliae is a West Atlantic species, which was first described from Texas Rueness (Spencer et al. 1981, L'Hardy-Halos and Rueness 1990, Scneider and Searles 1991, Furnari et al. 1998). However, on the basis of morphological and crossing studies, material from the American east coast described as A. byssoides or A. ...
... The tribe Callithamnieae is well known for its intricate and partly unsolved taxonomy and phylogeny, on the genus level as well as on the species level (e.g. Price 1978, Price et al. 1987, L'Hardy-Halos and Rueness 1990. In recent years, molecular studies have been applied to solve some of the many taxonomic problems within this tribe (Bhoday et al. 1994. ...
This thesis presents studies on introduced macroalgae in Norwegian waters, with a focus on the species Sargassum muticum, Aglaothamnion halliae, Neosiphonia harveyi and Heterosiphonia japonica. During the last fifty years, the number of introduced alga has increased rapidly along European coasts, and due to a growing concern about ecological impacts of non-native species, these introduced macroalgae have become a major research issue. Basic knowledge on taxonomy and ecology is, however, still lacking in many of the species concerned. The diversity of information that is required for the evaluation of impacts and consequences of each introduced species calls for a multi-method approach involving such diverse techniques as molecular analyses, laboratory experiments and field observations. The general objective of the thesis has been to investigate recently introduced macroalgae on the Norwegian coast in order to increase our present knowledge of their taxonomy and ecology.
... información sobre sus límites de distribución en diferentes áreas geográficas, y a la mala interpretación y confusión en la aplicación de nombres en diferentes tiempos, por diferentes ficólogos y en diferentes países. Esta situación ha cambiado sustancialmente a partir de los estudios de L' Hardy-Halos y Rueness (1990), Aponte y Ballantine (1990Ballantine ( , 1995), Aponte y Norris (1994) y Aponte et al. (1997), quienes han dado bases sólidas para la separación de estos géneros. ...
Bibliographic revision of species from the Tribe Callithamnieae (Ceramiaceae, Rhodophyta) previously recorded from the Atlantic Mexico's shores was realized. We also checked herbarium's specimens housed at different herbaria. In addition, some samples of Callithamnieae were carried out in twenty localities at the Atlantic coast of Mexico from 1983 to 2000. Analysis of this information showed us that this tribe contains three genera and five species. The best-represented genus of this Tribe was Aglaothamnion Feldmann-Mazoyer with three species. A. cordatum (Børgesen) Feldmann-Mazoyer is recorded from Cozumel island, Quintana Roo to Tampico, Tamaulipas, while A. boergesenii (Aponte et Ballantine) L' Hardy-Halos et Rueness and A. herveyi (M. Howe) Aponte, Ballantine et Norris only were found in the Caribbean Sea. The distribution of Callithamnion Lyngbye and Seirospora Harvey, with one species each, is restricted to Quintana Roo and Veracruz. The taxa of this Tribe are not easily noticed because of their epiphytic habit, filamentous forms and small size. Morphological descriptions, drawings, distributional range, reproductive stage, substrate, tidal level, wave exposure, keys for determinations and specimens examinated are included.
... However, these plants were not interfertile with C. byssoides from Norway nor with an isolate of C. roseum (a species with multinucleate cells) from Massachusetts. Aponte and Ballantine (1990) referred, on morphological grounds, plants from the Caribbean passing as C. byssoides to a new species, C. boergesenii**, which was considered by these authors and L'Hardy-Halos and Rueness (1990) to be different from North American plants then treated as C. byssoides. In a further study, L'Hardy-Halos and Rueness (1990) concluded on morphological and crossability grounds that European Aglaothamnion byssoides and A. pseudobyssoides represented two separate species with different geographical distributions in Europe, and that A. byssoides plants from North America were not related to either of these entities. ...
... Aponte and Ballantine (1990) referred, on morphological grounds, plants from the Caribbean passing as C. byssoides to a new species, C. boergesenii**, which was considered by these authors and L'Hardy-Halos and Rueness (1990) to be different from North American plants then treated as C. byssoides. In a further study, L'Hardy-Halos and Rueness (1990) concluded on morphological and crossability grounds that European Aglaothamnion byssoides and A. pseudobyssoides represented two separate species with different geographical distributions in Europe, and that A. byssoides plants from North America were not related to either of these entities. These authors also showed by crossability studies that A. furcellariae should be included in A. byssoides sensu stricto. ...
... These two species are morphologically identical in culture, but hybridization studies revealed the existence of two virtually non-interbreeding groups separated by various isolating mechanisms in the 10 populations examined. The two non-*L'Hardy-Halos and Rueness (1990), Rueness and L'Hardy-Halos (1991) and Maggs et al. (1991) have reinstated Aglaothamnion Feldmann-Mazoyer for species of Callithamnion with uninucleate cells. L'Hardy-Halos and Rueness (1990, p. 363) and discuss this in detail. ...
The species diversity of Callithamnion sensu lato in South Africa is re-visited using existing literature, morphology and DNA. The identity of a putative new species is confirmed as distinct using DNA and is described here as Callithamnion africanum sp. nov. Callithamnion africanum differs molecularly and morphologically from a similar species, C. cordatum with which it shares a similar habitat and distribution range in South Africa. Callithamnion africanum is resolved in the Callithamnion sensu stricto clade and is sister to the type species of the genus, Callithamnion corymbosum. Additionally, Callithamnion stuposum, a species described from South Africa and a common component of the seaweed flora, was recovered in the larger, unresolved Callithamnion sensu lato clade. An updated species inventory of Callithamnion sensu lato in South Africa is provided, and indicates a lack of sequence data for the large majority of species. Furthermore, a global rbcL phylogeny highlights a number of taxonomic concerns regarding the classification of taxa circumscribed to Callithamnion sensu lato and calls for a global revision using DNA, type specimens or material collected from near type localities.
A total of 205 species of marine macro-algae is reported for Samoa, with emphasis on the Apia District and vicinity. The flora now includes 134 species and 83 genera of Rhodophyta, 23 species and 15 genera of Phaeophyceae, and 48 species and 25 genera of Chlorophyta. Sixty-two of the records are additions to the Samoan flora, bringing the total known macro-algal flora for the entire Samoan Archipelago to 360 species and subspecific taxa. The following new combinations are made: Hinksia van-bosseae (Setchell & Gardner) Skelton and South (previously Ectocarpus van-bosseae), Antithamnionella simplex (Dawson) Skelton and South (previously Antithamnion simplex), Neosiphonia ferulacea (Suhr ex J. Agardh) Skelton and South (previously Polysiphonia ferulacea Suhr ex J. Agardh), Neosiphonia howei (Hollenberg in W.R. Taylor) South and Skelton (previously Polysiphonia howei Hollenberg in W.R. Taylor), and Neosiphonia polyphysa (Kutzing) South and Skelton (previously Polysiphonia polyphysa Kutzing. Four species are regarded as recently introduced to the Samoan flora: Spatoglossum macrodontum J. Agardh, Codium arenicola sp. inedit., Codium geppiorum O. Schmidt and Gracilaria ephemera Skelton, South & Millar. Their restriction to the area around the Harbour suggests that they were imported on shipping. Two species, Kappaphycus alverezii (Doty) Doty ex P. Silva and Eucheuma denticulatum (Burman) Collins & Hervey, were deliberately introduced for mariculture in the 1980s, but the farming failed and no relicts of these introductions have been detected. Ninety-five percent of the flora consists of widely distributed species (Western-Central Pacific, Indo-Pacific, pan-tropical / -subtropical, and cosmopolitan), and there is a very low level of endemism (1.3 %), which, it is suggested, may be due to the relatively young age of the Samoan Archipelago and to its position mid-way along the Indo-West Pacific biodiversity gradient. Taxonomic, nomenclatural and distributional appraisals of the species are presented, together with an iconography of digital images covering most species. Comparisons of Samoan specimens with collections from other Pacific Island material held in SUVA-A, and historical collections from Samoa algae held in UC and BISH, are also made to expand the scope of the treatments. Voucher material of all collections has been deposited in SUVA-A, with duplicates to be deposited in BISH.
Seven taxa of benthic marine rodophytes are reported for the first time from the Brazil littoral: Acrochaetium corymbiferum (Thur. in Le Jolis) Batters, A. liagorae Børgesen, Aglaothamnion herveyi (M.Howe) Aponte, D.L. Ballant. & J.N. Norris, Crouanophycus latiaxis (L.A. Abbott) Athanas., Grallatoria reptans M.Howe and Gelidiella sanctarum Feldmann & Hamel. Gelidiopsis repens (Kütz.) Weber Bosse this is the new reference to the Atlantic Ocean. The material collected on mediolittoral and infralittoral was deposited in the Herbarium Alexandre Leal Costa (ALCB) at the Universidade Federal da Bahia. Reference to the original description, basionym, morphological description, geographical distribution and taxonomical comments are presented for each taxon studied.
Maggs, C. A. & L'Hardy‐Halos, M.‐T.: Nuclear staining in algal herbarium material: a reappraisal of the holotype of Callithamnion decompositum J. Agardh (Rhodophyta). – Taxon 42: 521–530. 1993. – ISSN 0040‐0262.
The taxonomic importance of uninucleate vs. multinucleate vegetative cells in the Ceramiaceae is emphasized. It has been possible to make visible nuclei in old material, including type specimens, using aceto‐carmine and aceto‐iron‐haematoxylin stains. The holotypes of Ceramium roseum and Callithamnion fasciculatum (currently known as Callithamnion roseum and Pleonosporium borreri var. fasciculatum ) have uninucleate cells and belong to Aglaothamnion. In contrast, the holotype of Callithamnion decompositum , a name that has been applied to collections of at least two uninucleate taxa, has multinucleate cells; its morphological and cytological details agree with those of specimens collected in France and Ireland that were previously thought to represent an undescribed species. Female reproductive morphology (described from a thallus with gametangia in addition to tetrasporangia), in conjunction with habit and vegetative features, indicates that this species belongs to Compsothamnion (Compsothamnieae) , as a third species, being distinguished from C. thuyoides and C. gracillimum by its sessile, lateral tetrasporangia. The required new combinations under Aglaothamnion and Compsothamnion are made.
