Hymenochaete colliculosa (Sacc.) Parmasto, Mikol. Fitopatol.

He, Shuang-Hui, Liu, Shi-Liang, Li, Hai-Jiao & Dai, Yu-Cheng, 2017, Two new species of Hymenochaete (Hymenochaetaceae, Basidiomycota) and H. colliculosa new to China from Shanxi Province, Phytotaxa 324 (2), pp. 168-178 : 175-176

Hymenochaete colliculosa (Sacc.) Parmasto, Mikol. Fitopatol. 20(5): 375, 1986. ( Figs. 2c–d , 5 )

Basionym: Hymenochaete tabacina var. colliculosa Sacc., Malpighia 10: 263, 1896.

Description:— Basidiocarps perennial, effused to slightly effuso-reflexed, adnate, easily separated from substrate, coriaceous to corky, brittle when dry; effused part up to 7 cm long, 2 cm wide; reflexed part projecting up to 0.5 cm, up to 500 μm thick. Abhymenial surface brownish grey (6E2–F2), sulcate; margin indistinct, concolorous with abhymenial surface. Hymenophore surface tuberculate, with numerous small tubercles, greyish brown (6D3–F3), brown (6E4–8) to dark brown (6F4–8), not cracked or densely cracked with age; margin thinning, distinct, white (6A1) to brown (6E4–8), becoming thick, indistinct, concolorous with hymenophore surface with age. Tissues darkening in KOH. Anatomical structure Tomentum, cortex, hyphal layer, setal layer and hymenium present (in sect. Hymenochaete sensu Léger 1998 ). Hyphal system dimitic. Generative hyphae hyaline to light yellow, thin to slightly thick-walled, simple-septate, moderately branched, frequently septate, regularly arranged, 2–4 μm in diam. Skeletal hyphae golden brown to dark brown, distinctly thick-walled, not branched, not septate, 3–5 μm in diam. Setal hyphae abundant, golden brown to dark brown, distinctly thick-walled, with an acute tip, usually bent and penetrating into setal layer, up to 200 × 6 μm. Setal layer thickening with age, with one to several rows of overlapping setae, with embedded crystals. Setae subulate, reddish brown to dark brown, smooth or with a hyphal sheath, distinctly thick-walled, with an acute tip, 50–100 × 6–9 (–11) μm, embedded or projecting up to 50 μm beyond the hymenium. Cystidia and hyphidia absent. Basidia subclavate, with four sterigmata and a basal simple septum, 20–24 × 5–6 μm; basidioles similar to basidia but slightly smaller. Basidiospores ellipsoid to broadly ellipsoid, with an apiculus, hyaline, thin-walled, smooth, IKI–, CB–, usually bearing a guttule, 5–7 × 3.5–5 μm, L = 5.8 μm, W = 4 μm, Q = 1.3–1.6 (n = 90/2).

Specimens examined:— CHINA. Shanxi Province, Hunyuan County, Hengshan Forest Park, on base of living Berberis sp. , 29 April 2016, Dai 16427 (BJFC 022544), Dai 16428 (BJFC 022545) & Dai 16429 (BJFC 022546). RUSSIA. Altai Republic, Altai Nature Reserve, on dead twigs of Caragana arborescens , 9 September 1959, E.Parmasto TAA 8066; Krasnoyarsk Terr., Stolby Nature Reserve of Krasnoyarsk, on dead twigs of Caragana arborescens , 28 August 1971, E. Parmasto TAA 55195.

Remarks:— Hymenochaete colliculosa has been reported from the Middle Asia and Siberia on Caragana arborescens (Parmasto 2005) . It is characterized by perennial basidiocarps with a tuberculate hymenophore, the presence of a cortex and hyphal layer with numerous setal hyphae, and ellipsoid to broadly ellipsoid basidiospores. In the phylogenetic tree ( Fig. 1 ), H. colliculosa clustered with H. globispora with high support values. Hymenochaete globispora differs from H. colliculosa by smooth basidiocarps, an absence of setal hyphae and rounder basidiospores (4.5–5.5 × 3.5–4.5 μm, Parmasto 2005). This is the first report of H. colliculosa in China.

Figures

FIGURE 1. Phylogenetic tree inferred from maximum likelihood (ML) analysis based on a concatenated dataset of ITS and 28S sequences data of Hymenochaete species. Branches are labelled with maximum likelihood bootstraps and maximum parsimony bootstraps ≥ 50%, and Bayesian posterior probabilities ≥ 0.95.

FIGURE 2. Basidiocarps of Hymenochaete species a. Hymenochaete angustispora (Dai 17049, holotype). b. Hymenochaete verruculosa (Dai 17047, holotype). c–d. Hymenochaete colliculosa (Dai 16427). Bars = 1 cm. Photos by Shuang-Hui He.

FIGURE 5. Microscopic structures of Hymenochaete colliculosa a. Basidiospores. b. Basidia and basidioles. c. Setae. d. Setal hyphae. e. Hyphae from hyphal layer. Drawn by Hai-Jiao Li from Dai 16427.