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 Hymenochaete dura
BiostatusPresent in region - Indigenous. Non endemic
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, membranous, umbonate-sessile, or
resupinate, loosely attached save at the umbo, effused, appearing as numerous
small orbicular colonies 3-10 mm diameter, which may merge peripherally to form
irregular areas to 3.5 cm long; hymenial surface bay, tan, chestnut, or
ferruginous, sometimes velutinate or fibrillose, not creviced but often slightly
compressed in the centre; margin thinning out, concolorous, somewhat lighter in
colour in young specimens, fibrillose, loosely attached, sometimes bluntly
rounded. Context ferruginous, 0.2-0.45 mm thick, of radiately arranged mainly
parallel hyphae, cortex dense, chestnut, bearing numerous abhymenial hairs;
skeletal hyphae 3-4 µm diameter, walls 0.5 µm thick, pallid yellow-brown;
generative hyphae 2-2.5 µm diameter, walls 0.25 µm thick, hyaline. Setal layer
to 80 µm deep, a narrow area of 1-3 overlapping rows of somewhat sparse setae
irregularly inserted; setae irregularly fusiform or cylindrical with bluntly
acuminate apices, often curved or bent, some projecting to 30 µm, 30-60 x 5-8
µm, walls sometimes verruculose near apices, yellow or pallid chestnut, with
broad or narrow lumena. Hymenial layer to 30 µm deep, a somewhat sparse palisade
of basidia, paraphyses, and paraphysate hyphae. Basidia subclavate, 12-16 x 3-4
µm, bearing 2-4 spores; sterigmata slightly arcuate, slender, to 4 µm long.
Paraphyses cylindrical, 8-12 x 3-3.5 µm. Paraphysate hyphae sparse or abundant,
filiform, usually hyaline, projecting to 20 µm. Spores elliptical, 4 x 2 µm,
walls smooth, hyaline, 0.1 µm thick.
Habitat: HABITAT: Bark of dead erect stems associated with a white
rot.
Distribution: DISTRIBUTION: Cuba, Australia, New Zealand.
Notes: Collections agree with
the type of H. dura in Kew herbarium, ex "Cuba, C. Wright, No. 241",
differing in the thinner context and slightly narrower skeletal hyphae. Setae
resemble those of the type, and are unusual in their irregular shape, bluntly
acuminate apices, and presence of occasional false septa. Numerous filiform
paraphysate hyphae project and give to the hymenial surface its fibrillose
appearance, a condition also present in the type.
Spores were not
found in the type. Burt (1918b, p. 353) gave measurements as 5 x 3 µm for a
cotype specimen he examined. In collections from this region they are scanty,
for although basidia were present in some 20 sections examined, attached spores
were seen only in two. These were narrowly elliptical, 4 x 2 µm. Setae were
sparse in portion of the type examined. In collections listed they were found to
be sparse or abundant, being crowded in the central part, progressively more
scanty towards the periphery. Burt (1918b, p. 352) described, paraphysate hyphae
as paraphyses; the latter are, however, narrower and shorter than the basidia
and do not project.
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