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 Add this item to the list  Bondarcevomyces Parmasto, gen. nov.
Description type:Original description 
Description:Bondarcevomyces Parmasto, gen. nov.
Typus: Hapalopilus (Polyporus) taxi Bondartsev, Bot. Mater. Otd. Sporov. Rast. Bot. Inst. Akad. Nauk S.S.S.R. 5 (1-3): 17, 1940-- Bondarcevomyces taxi (Bondartsev) Parmasto.
Etymology. Apollinari S. Bondarzew and his daughter Margarita A. Bondarceva, Russian mycologists, authors of numerous works on Polyporaceae s.l.; mukes fungus. Gender: m.
Basidiomata pileate, soft, brittle and very light when dry, pilear surface orange, reddish orange or brown; tubes turning olive when bruised; smell strong, sweet, persistent in herbarium; rhizomorphs absent. Hyphal system monomitic; generative hyphae thin-walled, with clamps; gloeoplerous hyphae present, cystidia absent; basidia clavate, with 4 sterigmata; basidiospores with smooth, thickened, yellow or brownish dextrinoid walls; spore print ochraceous or brownish). Causing brown rot of wood.
Type of the new genus H. taxi has been combined in Tyromyces and Parmastomyces. All these genera have hyaline spores. Hapalopilus and Tyromyces species have indextrinoid and thin-walled spores; they cause a white rot of wood; gloeoplerous hyphae are absent in the basidiomata of Hapalopilus and most species of Tyromyces. The pigment causing brownish colour in B. taxi is different from the pigment(s) of Hapalopilus spp. (cf. Figs. 1-2). Parmastomyces has basidiomata with different colour and colour changes, a dark gelatinous line above the tube layer, lacks gloeoplerous hyphae, and has hyaline spores.
The peculiar colour and its change, as well as the consistency in B. taxi are also typical of Phaeolus schweinitzii (Fr.: Fr.) Pat., which has gloeocystidia and also causes brown rot of wood. The colour of Phaeo lus is caused by different pigments (Fig. 3), and its spores are hyaline and indextrinoid. Hapalopilus olivascens Corner has similar colour and colour change of basidiomata (see Corner, 1989: 69), but differs, inter alia, by its strongly inflated hyphae and white, thin-walled indextrinoid spores.
There are only few genera of polypores with brownish spores. Loweporus Wright has a dimitic hyphal system without gloeoplerous hyphae; Phaeotrametes Wright has a trimitic hyphal system, inamyloid, indextri noid spores, and gloeoplerous hyphae are absent in its only species (Wright, 1966). The only genus possibly related to Bondarcevomyces is Pseudopiptoporus Ryvarden with its only species P. devians (Bres.) Ryvarden. The latter species has been found only once in Mozambique on angiospermous wood (cf. Ryvarden & Johansen, 1980). It differs mainly from Bondarcevomyces in its dimitic hyphal system with generative hyphae and amyloid binding hyphae.
The differences indicated above show that Bondarcevomyces has an unique combination of important characters in polyporoid fungi. Also, there are no corticioid fungi with this unique combination. All this leaves Bondarcevomyces without a distinct place in the classification of Aphyllophorales. Temporarily it may be united with Phaeolus into Phaeolaceae (cf. Fiasson & Niemelä, 1984: 22), but not including that family into Hymenochaetales as has been done by Fiasson & Niemelä.
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