Figure 4 - uploaded by Wahid Ul Rehman
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Bryoerythrophyllum recurvirostrum found on Larsemann Hills: A, Shoots of gametophytes; B, Gametophytic shoot at 4Â; C, Leaf with coasta at 20Â; D, Cells of the leaf at 100Â. <scale bar: 3.5 cm (A); 10 mm (B); 5 mm (C); 2 mm (D)>.
Source publication
Bryum is recognized as a cosmopolitan genus of mosses in the family Bryaceae that contains the largest diversity of mosses. While there are around 100 species of moss species reported from Antarctica to date, the actual species diversity remains elusive as the continent remains one of the least explored habitats globally. Here, we describe a new sp...
Contexts in source publication
Context 1
... WP-863 showed resemblance with Bryoerythrophyllum recurvirostrum (Zander 1978), which was small in size with dark reddish-brown tufts. Stems were erect and sparsely branched ( Figure 4B). Rhizoids were present only on the lower parts of the stem, scattered, brown, smooth, and branched ( Figure 4A). ...
Context 2
... were erect and sparsely branched ( Figure 4B). Rhizoids were present only on the lower parts of the stem, scattered, brown, smooth, and branched ( Figure 4A). Younger rhizoids were lighter to hyaline. ...
Context 3
... rhizoids were lighter to hyaline. Leaves were regularly arranged and varied from ovate to oblong-lanceolate with coasta ( Figure 4C). Coasta was subpercurrent to percurrent, brown, smooth near base, slightly smaller toward the apex, and covered with quadrate papillate cells ventrally upward. ...
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Citations
... ex Schwaegr., and B. pseudotriquetrum (Hedw.) P. Gaertn., (Ochyra et al. 2008), most recently augmented with the recently described B. bharatiense Rehman, Gupta & Bast (Rehman et al. 2021). Other Bryum species have previously been reported to occur in Antarctica but have since been excluded (e.g. ...
... archangelicum, B. pallescens), two show disjunct distributions in South America, Antarctica, and the sub-Antarctic islands (B. nivale, B. orbiculatifolium), and B. bhatariense has only been recorded from its site of original description in the Larsemann Hills (Ochyra et al. 2008, Rehman et al. 2021). These species have mostly been identified in Antarctica based on their morphology and, in particular, on gametophytic traits as, at most occurrence sites, they are sterile due to the continent's harsh climatic and environmental conditions (but see Smith and Convey 2002). ...
Bryum is a moss genus that is widely distributed across the planet. Many of its species are characterized by large phenotypic and morphological plasticity, generating uncertainty in species identification exclusively based on morphological characteristics. In Antarctica, the extreme and harsh environmental conditions are further likely to promote intra-specific morphological variation, leading to complexity in the taxonomic attribution of Bryum species. In this study, we apply molecular phylogenetic analyses to assist in developing accurate species identification of B. pseudotriquetrum and two other relatively abundant Bryum species (B. archangelicum and B. pallescens) currently reported as Antarctic species.
A total of 51 Bryum samples collected in Antarctica (22) and from all other continents (29) were sequenced for ITS nrDNA and rps4 cpDNA regions, using markers widely used in moss phylogenetic studies. Phylogenetic trees were constructed including ITS (23) and rps4 (34) sequences representing the three more frequent of the seven Bryum species currently reported from Antarctica as well as several other Bryum species and related genera, incorporating all sequence data available in the literature and accessible databases. The molecular analyses provide strong support for a match between morphological and molecular attribution of specimens identified as B. pseudotriquetrum. The data also provide evidence of currently unrecognized Bryum diversity in Antarctica, with the identification of one individual of B. uliginosum. However, the analyses suggest that all Antarctic specimens currently assigned to other Bryum species are morphological variants of B. pseudotriquetrum. The integration of molecular and morphological analyses supports the presence of B. pseudotriquetrum as the most widely distributed species of the genus in Antarctica and of B. uliginosum with a much more restricted distribution (South Sandwich Islands). Our data suggest that further investigation is required of B. archangelicum and B. pallescens in other continents globally, as the identity of none of the herbarium specimens examined in this study could be confirmed with molecular data.
New distributional data are presented for 12 species of moss collected from the Graham Coast and Danco Coast together with their offshore islands on the west side of the Antarctic Peninsula. Pohlia wahlenbergii (F.Weber & D.Mohr) A.L.Andrews is new to the Antarctic Peninsula and the Graham Coast and it is the southernmost station of the species, whereas Warnstorfia sarmentosa (Wahlenb.) Hedenäs is new to the Danco Coast. Schizymenium pusillum (Hook. & Wilson) A.J.Shaw is recorded
for the first time on the Antarctic Peninsula mainland, and Schistidium rivulare (Brid.) Podp. is found at its southernmost locality on Cape Pérez on the mainland Graham Coast. Andreaea regularis Müll.Hal., Kiaeria pumila (Mitt.) Ochyra, Bucklandiella sudetica (Funck) Bedn.-Ochyra & Ochyra, Warnstorfia fontinaliopsis (Müll.Hal.) Ochyra and Pohlia nutans (Hedw.) Lindb. are new for Hovgaard Island in the Wilhelm Archipelago, and the latter is additionally recorded for the first time from Point Rasmussen on the mainland Graham Coast. Bryum pallescens Schleich. ex Schwägr. is new to Darboux Island, while Polytrichum juniperinum Hedw. and Brachythecium austroglareosum (Müll.
Hal.) Kindb. are new to Lahille Island in the Grandidier Channel. Updated distribution maps for all species in the study areas of the Danco and Graham Coasts and the northern Antarctic Peninsula
are presented. The moss floras of the Graham and Danco Coast regions consist currently of 51 and 47 species, respectively.
The present study documents the detailed taxonomic study of the identification keys of twelve species and infraspecific taxa of Bryophytes (one liverwort and eleven mosses) of Larsemann Hills, belonging to five families and seven genera. One species, Guembelia longirostris (Hook.) Ochyra & Zamowiec, is recorded for the first time from East Antarctica, earlier reported from West Antarctica. Bryum argenetum Hedw. var. argenetum is recorded for the first time from the Larsemann Hills and extends the range of distribution of other species on various islands of the Larsemann Hills.
