Phylum:Basidiomycota >> Class: Basidiomycetes >>  Order: Polyporales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Hyphoderma variolosum

Hyphoderma variolosum Boidin, Lanq. Et Gilles, Bull. Soc. Mycol. Fr. 107: 143. 1991.

Peniophora incarnate auct. non (Pers.) P. Karst., Hedwigia 28: 27. 1889; Lin et Chen, Taiwania 35: 94. 1990. (fide Wu 2002)

 Description: Macroscopic characters: Basidiocarps resupinate, effused forming orbicular area, 1.8 × 3.5 cm, very thin, 50–65 μm thick, adnate, ceraceous, even, not cracked, with extremely fine particles, looked like opaque punctate, loosely scattered, white gray, not changing color in 5% KOH; margins thining out, white or concolorous. Microscopic characters: Basal layer of context very thin, partially penetrating through the wall of cork cells of substrata, 10 μm thick; intermediate layer of context indistinct, masked by crowded erect gloeocystidia and metuloid cystidia, about 50 μm thick, composed of lon-gitudinally interwoven hyphae; hyphae (1.5)–1.8–2–(3) μm wide, with clamp connections, thin-walled, smooth, often gelatinized; metuloid cystidia cylindrical, 10–50 μm long, 5–8 μm wide including crystals, with rough crystals covered on the slightly swollen conic apex, 4–5 μm wide excluding crystals at apex, embedded or protruding, 15 μm high; gloeocystidia cylindrical, rounded or obtuse at apex, slightly flexuous, 5–6 × 50–55 μm, 9 μm wide at base, protruding 15–17.5 μm high, easily stained by phloxine, turning brown color in Mel-zer's reagent, arising from the basal few parallel hyphae, arranged in palisade, occupied the most space of the intermediate layer; hymenium indistinct; basidia subclavate, 7 × l5 μm, with 4 basidiospores; sterigmata 1.8 μm wide; basidiospores suballantoid, 4.2 × 11 μm, smooth, thin-walled, non-amyloid.

Taitung Hsien, Lanyu Hsiang, Yeiu Tsun, in the ditch of mountain, under the broad-leaved primary forests, alt. 50–300 m, Aug. 22, 1975, S.-H. Lin (NTU-3649).

 Habitat: On the dead twigs of the broad-leaved trees, associated with Hypoxylon sp. on the barks.

Europe, North America, South Africa, Australia, New Zealand, Japan and Taiwan.


Lin, SH. and Chen, ZC. 1990.


S. H. Lin

 Note: So far as we can determine, the hymenial layer, which is masked by the numerous cystidia and gloeocystidia becomes obscure and is not so dense a palisade of basidia as gen-erally described. The hyphae with clamps are not easy to find unless special care is taken.