Abstract: A group of new species all closely related with each other and with the genera Armillariella, Omphalina, and Pleurocybella, was found in the region of the Selva Boliviano-Tucumana on Argentine territory. These species are thus far the only ones which do not fit into the scheme outlined in my recent book,2 whereas almost 2000 collections from other South American stations including Brazil, Tierra del Fuego, Chile, Paraguay, Uruguay, Bolivia and Perti neatly fitted into the classification established by the author on the basis of previous studies. These three rebellious species differ from Armillariella in having somewhat thick-walled hyphae and consequently more elastic-toughish consistency; they combine lignicolous habit with absence of veil and rhizomorphs; one of these species appears to be even more aberrant because of the presence of clamp connec? tions. The hymenophoral trama is strongly irregular as in the genus Pleurocybella (Mycologia 39: 81. 1947) but this latter genus is characterized by the absence of pigmentation and by very short spores whereas the three new species have a strong intracellular pigmentation, the pigment being dissolved in the cell sap, and elongate spores; the stipe is practically absent in the type species of Pleurocybella and the lamellae consequently not decurrent and in a species ranged in Pleurocybella with some reservations, the stipe is eccentric and the lamellae adnato-subdecurrent; in the new South American species, the stipe is central or very slightly subeccentric. One of these species has markedly omphalioid habit but differs strongly from Omphalina?as do the other two?
Publication Year: 1944
Publication Date: 1944-07-01
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
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Cited By Count: 77
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