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 Hymenochaete attenuata
SynonymsStereum attenuatum
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 pileate, coriaceous, annual, sometimes reviving a second
season. Pilei at first orbicular and attached by a narrow umbo with reflexed
margins, soon merged laterally to form effused-reflexed linear areas to 12 x 2
cm, sometimes resupinate when loosely attached, reflexed portions with a radius
of 1-2 cm, extending laterally for the length of the fructification; pileus
surface at first fulvous, remaining so or becoming ferruginous, weathering to
grey, banded with concentric zones of different shades of brown, sometimes
radiately sulcate, tomentose, hairs often arranged in tufts; pileus margin
fibrillose, fulvous, entire or torn; hymenial surface at first fulvous, becoming
ferruginous or date-brown, sometimes colliculose, at length deeply creviced in
small radiate areas; hymenial margin thinning out, fibrillose, fulvous. Context
fulvous, 150-200 µm thick, of closely compacted parallel hyphae; cortex absent;
abhymenial hairs arising from context hyphae; skeletal hyphae 3-4 µm diameter,
walls 0.5 µm thick, golden yellow; generative hyphae 1.5-2 µm diameter, walls
0.2 µm thick, hyaline. Setal layer to 120 µm deep, composed of 1-3 rows of
overlapping setae; setae aculeate, often twisted on their axes, with acute
apices, a few domeL shaped, some projecting to 80 µm, 80-110 x 7-10 µm, walls
naked, deep reddish-brown, lumena narrow. Hymenial layer to 30 µm deep, a close
palisade of basidia, paraphyses, and coloured ends of skeletal hyphae. Basidia
subclavate, 20-24 x 4-5 µm, bearing 4 spores; sterigmata arcuate, slender, to 5
µm long. Paraphyses subclavate, 8-14 x 3.5-4.5 µm. Spores broadly elliptical,
5.5-6 x 4-5 µm, walls smooth, hyaline, 0.2 µm thick.
Habitat: HABITAT: Crowded on bark of dead twigs, branches and saplings
associated with a white rot.
Distribution: DISTRIBUTION: Java,
Malaya, Japan, Ceylon, Australia, New Zealand.
Notes: In microfeatures
collections match an authentic Leveille specimen from Java in Kew herbarium.
They differ in that pilei are not so well developed and the hymenium becomes
deeply creviced when old. The species has been placed under Section II, which
contains plants with a well developed context but without a cortex.
Plants at first are orbicular and either resupinate or sessile-umbonate
with upturned margins. They soon merge to form linear areas with broad
resupinate bases and narrowly reflexed margins. The pileus surface is tomentose,
hairs becoming compacted into tufts, and arranged in concentric zones of various
shades of brown. Pilei are both concentrically and radiately sulcate, these
conditions being reflected in the hymenial surface. At first bright fulvous,
colour of the pileus surface changes to ferruginous with fulvous margins, and
weathers some shade of grey. Pilei are soft and papery, and may be folded
without fracture. The hymenium is at first fulvous, soon becoming date-brown and
in New Zealand collections fissured so deeply that the fulvous context becomes
exposed. Crevices are often arranged in radiate series not unlike those of some
resupinate collections of H. obesa. Setae are narrowly aculeate and
naked, some being twisted on their axes. A few are short with rounded domed
apices (Fig. 161), similar setae being present in the Leveille specimen.
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