Fig 13 - uploaded by Gabriel Moreno
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-Lepidoderma chailletii AH 25821, a. Sporocarps, b. Crystalline scales, c-d. Details of the outer reticulate capillitium, e. Tips of the capillitium, f. Capillitium reticulate at the tips, g-h. Capillitium with a granulose cover, i-j. Spores, k. Details of the spore ornamentation. Scale bars: a = 1 mm, b-d = 50 µm, e-f = 20 µm, g-h = 5 µm, i-j = 2 µm, k = 1 µm.
Source publication
This work is a morphological study of the nivicolous species within the genus Lepidoderma and, wherever possible, the type material has been studied. Both macro- and microphotographs are provided.
The ornamentation of the spores was studied under SEM with the critical point technique,
so we can provide a plate with the most distinctive features of...
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Citations
... comprises P. fallax, formerly included in the genus Diderma. The sporophores of this species can bear a more or less densely covering of lime squamules, giving it the appearance of other Polyschismium species, with which it shares large spines as sporal ornamentation (Meylan 1927, Martin & Alexopoulos 1969, Poulain et al. 2011, Moreno et al. 2018). ...
The class Myxomycetes consists of free-living protists characterised by their complex life cycle, which includes both microscopic (amoebae, flagellates and cists) and macroscopic stages (spore-bearing fruiting bodies, sclerotia, and plasmodia). Within it, the order Physarales , with more than 450 recognised species, constitutes the largest group. Although previous studies have shown the polyphyly of some of the traditionally accepted genera, its internal phylogenetic relationships have remained uncertain so far, and together with the lack of data for some key species, it prevented any taxonomic and nomenclatural revisions. We have compiled a substantially expanded dataset in terms of both taxon sampling and molecular data, including most of the genera described to date and four unlinked DNA regions, for which we provide partial sequences: nSSU, EF-1α , α-Tub , and mtSSU, analysed through maximum likelihood and Bayesian methods. Our results confirm that the family Didymiaceae is paraphyletic to the rest of Physarales . Within Didymiaceae s.lat., the recent reinstatement of the genus Polyschismium for most species traditionally ascribed to Lepidoderma , except for the type (Ronikier et al. 2022), is further supported here, as well as the definite inclusion of the genus Mucilago in Didymium and Lepidoderma s.str. ( L. tigrinum ) in Diderma (Prikhodko et al. 2023). Additionally, the genus Diachea is redefined to include some species previously treated in Physaraceae ( Craterium spp. with true columella). Within the monophyletic family Physaraceae , most genera are recovered as polyphyletic, suggesting that they should be no longer accepted as currently defined. However, the lack of resolution of some relationships within Physaraceae prevents us from resuscitating or creating several new genera to mitigate polyphyly. Among the well-defined groups with clear molecular signatures, we propose two taxonomic and nomenclatural changes at generic level: 1) a new genus, Nannengaella , is proposed for a major clade containing Physarum globuliferum and other species with heavily calcified sporophores and, often, a true calcareous columella; 2) Lignydium is resurrected for the clade containing Fuligo muscorum . Additionally, Trichamphora is suggested as the correct name for the clade containing Physarum pezizoideum . The taxonomy and nomenclature of some provisional genera, currently synonymous with Fuligo and Physarum , are disentangled, and we provide a comprehensive and updated nomenclatural conspectus that can be used when better resolved phylogenies are obtained. In total, 22 new combinations are proposed in different genera. A provisional key to the genera of the order is also provided.
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This study introduces two new protozoan and fungal species for the first time to the Egyptian environment. The first one is myxomycetous, Lepidoderma carestianum and the second is the ascomycetous; Arthrinium bambusicola. The sporocarp of L. carestianum was discovered attached to the soil surface while, A. bambusicola was found growing saprophytically on the dead branch of a tree. Both specimens were transferred to the laboratory to be cultivated as pure cultures and subjected to identification process; morphologically and genetically.
... 2C). My description of the microscopic features of the tested myxomycete is agreed with [5,21] except in, they did not explore any ndings of the motile cells appeared here in my investigation. ...
Background: Slime molds (Myxomycetes) considered a separate group of protozoal organisms, related to rhizopoda and primitive fungi. They are characterized by forming large multinuclear plasmodia devoid of cell walls and their complex life cycles. On the other hand, ascomycetous fungi are considered large group which includes diversity of fungal genera ranged between pathogenic and saprophytic habitat.
Results: The tested fungi, Lepidoderma carestianum which belongs to (Myxogastria, Amoebozoa) and the ascomycetous fungus; Arthrinium bambusicola were recorded for the first time in Egypt. Detailed morphological description and microscopic examination for these fungi were exhibited in this study.
Conclusions: Sporocarp of L. carestianum was appeared at cold climate at November 2021 on the surface of cultivated soil while, A. bambusicola was isolated from dead branch of Melia azedarach tree on PDA medium as a saprobe. The most obvious feature of the isolate colony was the presence of the black colour regions due to conidiomata embedded in the white mycelia. The fungal conidia are distinguished by dark brown colour, oval shaped with tapered ends. The definition of the tested Lepidoderma and Arthrinium species was confirmed by molecular characterization using COIF1/COIR1 primers for Lepidoderma and ITS1 and ITS4 primers for Arthrinium.
Myxomycetes, or plasmodial slime molds, are a monophyletic group ofamoeboid protists whose classification is based mainly on morphological features of fruiting bodies. Although published phylogenies based on one or two genetic markers have clarified the boundaries of the main order-level systematic groups, the position and composition of some families and genera of myxomycetes are still a topic for discussion. In this study, we reconstructed the phylogeny of the family Didymiaceae based on three independent genetic markers: the 18S rDNA gene, the translation elongation factor 1-alpha, and the cytochrome c oxidase subunit 1 gene. Maximum likelihood and Bayesian inference phylogenetic analyses produced congruent topologies and showed that of the five major genera of the family, only species of the genus Diachea form a monophyletic clade, while the other four genera are clearly para- or polyphyletic. Species of the genus Didymium form a monophyletic clade with the only species of the genus Mucilago.The polymorphic species Lepidoderma tigrinum is clearly placed among 13 species of Diderma, including the type species of the genus. All other studied species of Lepidoderma form a separate clade together with Diderma fallax. We thus extend the latest nomenclatural revisions by disbanding the genera Mucilago and Lepidoderma, whereby the single species of Mucilago is transferred to the genus Didymium and L. tigrinum to Diderma. Extended taxon sampling allows the transfer of more nivicolous species of the former genus Lepidoderma to Polyschismium.
