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

Hyphoderma subpraetermissum Sheng H. Wu, Bot. Bull. Acad. Sin. 38: 68. 1997..

 Description: Basidiocarp resupinate, effuse, ± adnate, 50-120 μm thick in section, membranaceous- subceraceous. Hymenial surface whitish, cream-colored when old, slightly purplish tinted due to the small excreted dots, smooth, not cracked; margin thinning, concolorous or paler, pruinose-filamentose. Hyphal system monomitic; hyphae nodose-septate. Subiculum composed of a thin basal layer and a medullary layer, the former sometimes indistinct, medullary layer with fairly loose texture; hyphae colorless, 3-6 μm diam., with 0.5-1 μm thick walls. Stephanocysts located in deep subiculum, 8-11 μm diam. for global apices, Cystidia abundant, emergent or immersed, colorless, usually apically covered with brownish resinous material, cylindrical or ventricose, sometimes tapering towards apices, 30-100 × 7-15 μm, with 0.5-1.2 μm thick walls, occasionally with secondary septa. Basidia utriform, 20-35 × 6-8 μm, 4-sterigmate, occasionally with secondary septa. Basidiospores ellipsoid or broadly ellipsoid, adaxially slightly concave, smooth, thin-walled, 6.2-7.5 × 4-5 μm (holotype spore-print: X = 6.94 ± 0.31 × 4.44 ± 0.37 μm, n = 30), IKI-, CB-.

Taiwan Taichung: Anmashan, alt. 2,250 m, on branch of angiosperm, 7 Jun 1995, Wu 9506-27 (TNM).

 Habitat: null



Wu, SH. 1997.


S. H. Wu

 Note: This species belongs to Hyphoderma praetermissum (P. Karst.) J. Erikss. & Strid group due to the presence of similar cystidia and stephanocyts. Hallenberg et al. (1994) have detected five incompatible sibling species of H. praetermissum complex, based on collections from various cuntries of Europe, Turkey, and Canada. Nevertheless, basidiospore lengths measured from all these studied specimens are longer than this species. Wu (1990) measured basidiospores of Taiwanese H. praetermissum as 8.8-12 × 4.2-5 μm, which is distinctly longer than this proposed new taxon. Both bipolar heterothallism and homothallism within H. praetermissum complex have been detected by Boidin (1958). Tetrapolar sexuality of H. subpraetermissum, hitherto is only known for species of Hyphoderma.