Hyphodontia dimitica Jia J. Chen & L.W. Zhou, 2016

Chen, Jia-Jia, Zhou, Li-Wei, Ji, Xiao-Hong & Zaho, Chang-Lin, 2016, Hyphodontia dimitica and H. subefibulata spp. nov. (Schizoporaceae, Hymenochaetales) from southern China based on morphological and molecular characters, Phytotaxa 269 (1), pp. 1-13 : 4-7

Hyphodontia dimitica Jia J. Chen & L.W. Zhou , sp. nov. ( Figs. 1–2 )

MycoBank no.: MB 815784

Differs from other Hyphodontia species by poroid hymenophore, white, cream to buff pore surface, large pores (2–4 per mm), a dimitic hyphal structure with thick-walled generative hyphae, and ellipsoid basidiospores measured as 3.8–4.6 × 2.8–3.5 μm.

Type.— CHINA. Hunan Prov.: Zhangjiajie National Park, alt. 650 m, on rotten angiosperm branch, 17 August 2010, Dai 11686 (holotype, BJFC!).

Etymology.— Dimitica (Lat.) referring to a dimitic hyphal structure.

Basidiocarps. —Annual, resupinate, adnate, soft, without odor or taste when fresh, becoming corky upon drying, up to 5.5 cm long, 1.5 cm wide and 2.2 mm thick at center. Hymenophore poroid. Pore surface white when fresh, becoming cream to buff upon drying; pores angular, 2–4(5) per mm; dissepiments thin, entire; sterile margin white, up to 2 mm wide. Subiculum cream to buff, very thin, up to 0.2 mm thick. Tubes cream, corky, up to 2 mm long.

Hyphal structure.— Hyphal system dimitic; generative hyphae with clamp connections; skeletal hyphae IKI–, CB+; tissues become reddish brown in context, others unchanged in KOH.

Subiculum. —Generative hyphae hyaline, thick-walled, moderate branched, 3–5 μm in diam; skeletal hyphae dominant, hyaline, thick-walled with a narrow lumen, rarely branched, flexuous, interwoven, 3–6 μm in diam. Big rhombic crystals sometimes present.

Tubes. —Generative hyphae hyaline, thick-walled, frequently branched, 2.5–4 μm in diam.; skeletal hyphae dominant, hyaline, thick-walled with a narrow lumen, rarely branched, flexuous, interwoven, 2–4 μm in diam. Basidia clavate to barrel-shaped, with four sterigmata and a basal clamp connection, 9–13 × 4.5–6 μm; basidioles dominant, in shape similar to basidia, but slightly smaller.

Spores.— Basidiospores ellipsoid, hyaline, thin-walled, usually bearing one small guttule, smooth, IKI–, CB–, (3.6–)3.8–4.6(–4.8) × 2.8–3.5(–3.6) μm, L = 4.1 μm, W = 3.13 μm, Q = 1.26–1.37 (n = 60/2).

Additional specimen examined.— CHINA. Guangxi Autonomous Region: Longzhou County, Nonggang Nature Reserve, alt. 450 m, on rotten angiosperm twig, 5 June 2015, Dai 15321 (paratype, BJFC!).

Figures

FIGURE 1. Basidiocarps of Hyphodontia dimitica (Dai 15321). a. A fresh basidiocarp. b. Pore surface.

FIGURE 2.Microscopic structures of Hyphodontia dimitica (Dai 11686).a Basidiospores. b Basidia and basidioles. c Rhombic crystals. d Hyphae from trama. e Hyphae from subiculum.