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 Hymenochaete cacao
SynonymsStereum cacao
BiostatusAbsent from region
Article: Cunningham, G.H. (1963). The Thelephoraceae of Australia and New Zealand. New Zealand Department of Scientific and Industrial Research, Bulletin 145: 359 p. Wellington:.
Description: Hymenophore annual, coriaceous, pileate,
sessile. Pilei applanate, sometimes imbricate, 1-3 cm radius, 3-7 cm wide;
pileus surface tobacco-brown, finely tomentose, concentrically zoned, plicate;
pileus margin lobed, acute, plane; hymenial surface tobacco-brown, or umber,
even, not creviced. Context ferruginous, to 500 µm thick, of compact parallel
hyphae; cortex absent; abhymenial hairs closely arranged, slightly inflated at
apices, brief; skeletal hyphae to 6 µm diameter, walls 0.5 µm thick,
ferruginous; generative hyphae 3.5-4 µm diameter, walls 0.2 µm thick, hyaline or
tinted yellow. Setal layer to 95 µm deep, composed of 3-5 rows of overlapping
crowded setae; setae aculeate or fusiform, some projecting to 20 µm, 25-40 x 5-7
µm, walls naked, reddish-brown, 1-2 µm thick. Hymenial layer to 30 µm deep, a
dense palisade of basidia and paraphyses. Basidia cylindrical, 12-18 x 4.5-5 µm,
bearing 4 spores; sterigmata erect, to 4 µm long. Paraphyses cylindrical, 8-12 x
3-3.5 µm. Spores elliptical or suballantoid, 4-4.5 x 2.5-3 µm, walls smooth,
hyaline, 0.1 µm thick.
Habitat: HABITAT: Bark of dead
branches; type of rot not seen.
Distribution: DISTRIBUTION: India, South America,
West Indies, Australia.
Notes: The collection listed
has been compared with the type in Kew herbarium and found to agree in most
features, differing in that surface hairs are more strongly developed. The
species is pileate and, as it is without a cortex, belongs to Section II. It may
be recognised by the small setae crowded in three to five overlapping rows, and
short abhymenial hairs with slightly inflated apices arising directly from the
context.
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