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Literature:
 
Page number:433 
Description type:Non-original description 
Description:HYDNOCHAETE OLIVACEA (Schw. ex Fr.) Banker. Fig. 3. Mycologia 6:234, 1914. - Hydnum olivaceum Schw. ex Fr. Elench. Fung. 1:234. 1828. - Sistotrema olivaceum Schw. Schr. Nat. Ges. Leipzig 1:101, 1822. - Sistotrema fuscescens Schw. Ibid. p. 102. - Irpex cinnamomeus Fr. Epicr. p. 524, 1838 (Teste Bresadola in UPS on label of isotype of S. olivaceum Schw.). - Irpex quisquilaris Pat. Bull. Herb. Boiss. 3:55, 1895.
FRUITBODY resupinate, effused, adnate and coriaceous, annual, margin wide to narrow, pale cinnamon to rusty brown, hymenophore hydnoid with irregular, round to flattened teeth with numerous projecting setae, obtused to incised in the top, often anthlerlike with a fused base, shorter at the margin than in more mature parts of the fruitbody, 0.5-2.5 mm long, cinnamon in fertile specimens, more rusty brown in sterile and old specimens. CONTEXT up to 0.3 mm thick, rusty brown, in old specimens with a black zone next to the substrate.
HYPHAL SYSTEM dimitic, generative hyphae with simple septa, in the hymenial parts thin-walled, hyaline, 1.5-3µm wide, frequently branched, in the trama and context more thick-walled, yellow and with scattered septa and moderately branched, 2-5 µm wide, skeletal hyphae dominating, thick-walled to solid, yellow to pale rusty brown, 3-5(5) µm wide. There are a few transitional hyphae, they are thick-walled and with one to two septa, and it is difficult to decide whether they represent the start of a skeletal hyphae or very mature generative ones. SETAE abundant in the hymenium and subhymenium, projecting up to 50 µm, more scattered in the context and trama, thick-walled, dark brown, straight to slightly bent at the base, of even thickness in the upper part, distinctly tapering towards the base, 60-200 x 8-15 µm, those of the hymenium usually shorter than those, of the context and trama. Basidia clavate, 6-12 x 4-5 dim with 4 sterigmata. SPORES cylindrical to allantoid, hyaline, thin-walled, smooth and non-amyloid, 4-5 x 1-1.5 µm.
On deciduous wood of many kinds, often on dead branches still attached to the trees. Known from South-East Canada, United States south to Florida and west to Wisconsin. Jamaica and Ecuador.
REMARKS. The species is usually easy to recognize because of the cinnamon and coriaceous fruitbody, often with a narrow pileus. The teeth are usually forked and flattened in more mature specimens while younger ones are more hydnoid. The setae are slender and abundantly present, while they are rather scarce in H. tabacina. Further, the latter has also a more distinct duplex consistency and skeletal hyphae only in the subiculum. In H. olivacea skeletal hyphae are present throughout the fruitbody. H. resupinata has a distinct fimbriate fruitbody, a granular to odontioid hymenphore and dendroid skeletal hyphae throughout the fruitbody.
Representative specimens: USA: Pennsylvania, Salem Syn. 540 (PHIL Lectotype of S. olivaceum). - ECUADOR: Pululahua, Pichincha, Aout 10. Lagerheim no 32 (PH, lectotype of Irpex quisquiliaris Pat.) - CANADA: Ontario, Petawawa Forest. Experimental Station. Leg. J. Mounce 18. July 1935 (DAOM). - USA: Tennessee, Great Smokey Mts. Nat. Park. Loudon Co. Codes Cove. 5. Sept. 1977. L. Ryvarden 14052 (0). - JAMAICA: Portland parish, Green Hills. 28. July 1968. B. Lowy no. JA 826 (LSU).
 
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