ALBERTO edgardo Omar
Morphologic characterization of Agrocybe cylindracea (Basidiomycetes, Agaricales) from America, Europe and Asia
UHART, M; ALBERTÓ E.
REVISTA MEXICANA DE MICOLOGIA
Sociedad Mexicana de Micología
Lugar: Xalapa; Año: 2007 vol. 24 p. 9 - 18
In the present study, 52 collections of A. cylindracea (Basidiomycetes, Agaricales, Bolbitiaceae) from distant geographic origins were studied with the aim of defining all the variable morphologic characters and to determine if these collections could be considered as one species or if A. cylindracea includes more than one taxon from a morphological perspective. For macroscopic characterization, fresh basidiomata collected in nature or obtained in culture were studied and for microscopic examination dried material from two Argentinean herbaria were also included. According to our results, specimens from different geographic origins are macroscopically similar, being the pileus surface and color highly variable depending on the collection or the environmental conditions on which basidomata were produced. Based on microscopic differences, we defined two morphotypes: 2-spored and 1- to 4-spored. The former contains mostly 2-spored basidia and spores 10-16 (-17) x 5-9 (-10) mm. The latter contains variable percentages of 1-, 2-, 3- and 4-spored basidia or mostly 4-spored basidia and smaller spores, (8-) 9-11 x 5-6 mm. The 2-spored morphotype includes collections exclusively from South America and Asia; the 1- to 4-spored morphotype contains specimens from Central- and South America, Europe and Asia. The taxonomic significance of these differences is discussed. A list of synonyms of A. cylindracea recorded in literature is given and the reason for which the name A. cylindracea should be used is presented in detail.