ALBERTO Edgardo Omar
congresos y reuniones científicas
A new species of Claudopus (Entolomataceae ?Basidiomycota) from the Argentinean Atlantic Forest.
Congreso; IX Congreso Latinoamericano de Micología; 2017
ClaudopusGillet is characterized by its crepidotoid or pleurotoid basidiomata, withabsent or reduced lateral stipe and distinctly angular spores in all views.Some authors consider Claudopus as anindependent genus, meanwhile others mycologists treated Claudopus as a section within Entoloma,a current and popular trend. Worldwide,species of Claudous are scarce withapproximately 20 species described to date. From South America, only six speciesof Claudopus were described: C. tympanifer Horak, C. cyaneum Murrill, both from Brazil, C. depluens var. macrosporus Dennis, from Venezuela and C. chilensis Speg. from Chile. In Argentina, we recorded two Claudopus species described bySpegazzini: C. argentinus Speg. and C. argentinensis Speg., but both specieswere currently transferred to Rhodocybeand Entoloma respectively. The aim ofthis paper is to propose, describe and illustrate a new species of Claudopus recently found in the Atlanticforest in northeastern Argentina. The specimens studied were collected by theauthors in protected areas and deposited in CTES Mycological Herbarium. Thesespecimens were documented both macro and macroscopically.  For microscopic characters, a light microscopy(LM) and a scanning electron microscopy (SEM) were used. The species heredescribed is distinguished from other species of Claudopus by the darker basidiomata colorations and it is characterizedby the black to dark gray with somebrownish gray pileus surface colors and pinkish brown to brownish gray, ventricose lamellae, lack of astipe, heterodiametric spores, 8.5?11.5x 5.5?7.5 µm in size, and lack of any type of cystidia. Claudopus byssisedus, the most phenetically related species and with awide distribution in temperate and colder regions, but has a paler coloration, narrowerlamellae and slightly larger spores. This new species is somewhat reminiscentof members of the Entoloma rusticoidesgroup because of the colors of the pileus and lamellae, however members of thatgroup have well developed stipes and isodiametric basidiospores.