Boletales » Boletales genera¬†incertae sedis » Corneromyces

Corneromyces kinabalui

Corneromyces kinabalui Ginns 1976, in Ginns, Mycologia, 68(5), 970-975 (1976)

Diagnosis: Basidiocarps effused. separable, firm, brittle, over 11 X 4 cm and ca. 0.5(-0.8) mm thick. Margin pale brown, tomentose. abrupt, to 0.5 mm wide, with prominent, scattered, whitish to brown strands. to 1 mm diam, which permeate the rotted substrate. Hymenial surface snuff brown, amber to grey brown (5YR3/4 to 7.5YR5/4). when young smooth, shiny, to the touch soft, velvety. to the eye mealy to granulose, evenutally with scattered to crowded, fine, sterile, hair-like processes, -170 X 30-80 µm. Context when fresh brownish umber, drying dull brown, darker brown than the hymenial surface, coarsely granulose, to 0.5 mm thick, appearing stratose in vertical sections due to hymenial thickening. Hyphal system monomitic. Generative hyphae woven, often branched, some hyaline and thin-walled but mostly with the walls rather thick (0.5-1.5 µm), brownish in water, only slightly darker in Melzer's and blackening in KOH, with clamp connections, 2-4( -5) µm diam. Hymenium thickening, -200 µm; the older elements darkening in KOH, predominately of narrow ( 2-4 µm diam), irregularly branched hyphae. Cystidia lacking, but aborted and old basidia, imbedded in the thickening hymenium, with thin to somewhat thickened brownish walls and giving the appearance of cystidia. Projecting hair-like processes composed of loosely woven, excrescent hyphae, 2-4 µm diam., often irregular, with hyaline to pale brown walls, generally with interspersed crystals or irregular crystalline deposits. Basidia clavate with a narrow, stem like base, hyaline, 55-70 X 10-13 µm, projecting 10-30 µm; sterigmata (2-)4, up to 15 µm long. Spores in face view straight, narrowly ellipsoid, nearly cylindrical, in profile similar but the adaxial surface slightly flattened and often indistinctly depressed near the apiculus, (18-)24-28(-31) X 7-10 µm: apiculus small, narrow. The spore wall smooth, thickened (2-2.5 µm in KOH), at first hyaline, becoming brown, cyanophilous, amyloid (blackish-blue or purplish) in Melzer's.

Index Fungorum Number: IF311835

Figure 1. Corneromyces kinabalui (RSNB 5345). Vertical section showing microscopic detail of sterile processes (top), thickened hymenium ( center) and context tissue (bottom). Del. E. ]. H. Corner.


Figure 2. Corneromyces kinabalui (RSNB 8415). Microscopic features. Spores hyaline and pigmented (stippled), hyphoid cystidium lower left, two basidioles and basidium. Spore at lower left is drawn with cytoplasmic fragments (hatched) adhering to the wall. Del. Ginns.