Search on : Taxa descriptions

 


   
Literature:
 
Page number:693 
Remarks (public):This polypore is readily identified in the field by the greenish olivaceous colour of the pore surface and the strong unpleasant odour. We believe it is better placed in Tyromyces than in Hapalopilus as the tissue does not show the cherry red discolouration in KOH that is a basic character for Hapalopilus. 
Description type:Non-original description 
Description:Tyromyces taxi (Bondartzev) Ryvarden & Gilb. , comb. nov. Basionym: Polyporus taxi Bondartzev, Bot. Mater. Otdel. Spor. Rast. 5(1-3):17, 1940.Hapalopilus taxi (Bondartzev) Bondartzev & Singer, Ann. Mycol. 39:52, 1941.
Basidiocarps annual, sessile or laterally substipitate with a narrowed base, single, dimidiate, soft and spongy when fresh, drying brittle and very light in weight, up to 4 cm wide, 3 cm long, and 0.8 cm thick; upper surface of pileus pale yellowish brown to orange brown to darker rusty brown at the base, with greenish shades toward the margin, tomentose to strigose or scrupose in spots, on the narrowed rusty brown basal part more radially appressed-strigose, margin rounded, with greenish tints, narrowly sterile below; pore surface olivaceous green, the pores angular, mostly 2-3 per mm with occasional larger ones up to 1 mm wide, the dissepiments thin, entire; context pale greenish buff, azonate, soft-fibrous, up to 6 mm thick, instantly turning black where touched with KOH solution; tube layer concolorous with context in lower part, pale greenish buff nearer the context, up to 2 mm thick; odor strong and unpleasant like decaying plant material or garbage, persistent in dried herbarium specimens for years. Hyphal system monomitic; contextual generative hyphae hyaline to pale yellowish, thin-walled, collapsing readily, with clamps, mostly 2-5 µm but some inflated up to 89 µm in diam; tramal hyphae similar; hyphae in all tissues interwoven and collapsing readily, difficult to see clearly, gloeoplerous hyphae also present.
Cystidia absent, fusoid cystidioles present, 13-22 x 4-5 µm, with a basal clamp. Basidia clavate, 4-sterigmate, 20-24 x 5.5-6.5 µm, with a basal clamp.
Basidiospores cylindric, ellipsoid to oblong, hyaline, smooth, negative in Melzer's reagent. 4.5-5 x 2-2.5 µm.
Type of rot. Presumably white rot of dead conifers.
Cultural characteristics and Sexuality. Unknown.
Substrata. Reported from Taxus and Larix.
Distribution. Known from the Black Sea coast of the Caucasus Mountains and in Novosibirsk in eastern Russia.
 
Taxon name: