Truncospora wisconsinensis C.L. Zhao & Pfister, 2016

Zhao, Chang-Lin, Xu, Feng & Pfister, Donald H., 2016, Morphological and molecular identification of a new species of Truncospora (Polyporales, Basidiomycota) in North America, Phytotaxa 257 (1), pp. 89-97 : 93-95

Truncospora wisconsinensis C.L. Zhao & Pfister , sp. nov. ( Figs. 3 , 4 )

MycoBankno.: MB 816122

Basidiocarps annual, pileate. Pileal surface white when fresh and white to pale whitish upon drying. Pore surface white; pores round. Hyphal system dimitic with subparallel to parallel, unbranched and slightly dextrinoid to non-dextrinoid skeletal hyphae. Basidiospores ellipsoid, hyaline, thick-walled, strongly dextrinoid, strongly cyanophilous, 9–11 × 6–7.5 μm.

Type.— USA. Wisconsin, Dane County, Madison, Lakeshore Nature Reserve, alt. 263 m, on fallen trunk of Quercus alba , 10 December 2014, CLZhao 005/FH 00290969 (holotype, FH!).

Etymology.— wisconsinensis referring to the locality of the type specimens.

Basidiomata. —Annual, pileate, solitary or gregarious, without odor or taste and corky when fresh, becoming hard corky upon drying. Pilei dimidiate, projecting up to 1.5 cm, 2.5 cm wide, 1.2 cm thick at centre. Pileal surface pure white when fresh and white to pale whitish upon drying (59-60), smooth, gently concentrically sulcate, glabrous, margin sharp. Pore surface pure white when fresh (60), white to grayish upon drying (59-60); pores round, 3–5 per mm; dissepiments thick, entire. Sterile margin narrow, white, up to 0.5 mm wide (60). Context white to pale cream (21, 60), up to 7 mm thick. Tubes concolorous with pore surface, up to 5 mm long.

Hyphal structure.— Hyphal system dimitic; generative hyphae with clamp connections; skeletal hyphae non- to slightly dextrinoid, strongly cyanophilous; hyphae unchanged in KOH.

Context trama. —Generative hyphae infrequent, hyaline, thin-walled, usually unbranched, 2–4 μm in diam; skeletal hyphae dominant, hyaline, thick-walled with a wide to narrow lumen, unbranched, subparallel to parallel, 3–5.5 μm in diam.

Tube trama. —Generative hyphae infrequent, hyaline, thin-walled, usually unbranched, 2–3.5 μm in diam; skeletal hyphae dominant, hyaline, thick-walled with a wide to narrow lumen, unbranched, subparallel to parallel, 2.5–4 μm in diam.

Hymenium . —Cystidia absent, but fusoid cystidioles present, hyaline, thin-walled, 15–20 × 3.5–5.5 μm; basidia not seen; basidioles predominant, barrel-shaped to pear-shaped; basidiospores ellipsoid, truncate, hyaline, slightly thick-walled, smooth, strongly dextrinoid, strongly cyanophilous, (8–)9–11(–11.5) × (5.5–)6–7.5(–8) μm, L = 9.8 μm, W = 6.58 μm, Q = 1.44–1.58 (n = 120/4).

Additional specimens examined.— USA. Wisconsin, Dane County, Madison, Lakeshore Nature Reserve, alt. 263 m, on fallen trunk of Quercus alba , 10 December 2014, CLZhao 006/FH 00290968, CLZhao 007/FH 00290967, CLZhao 008/FH 00290966 (paratype, FH!).

Figures

FIGURE 3. Basidiomata of Truncospora wisconsinensis (drawn from the holotype). Scale bars: a= 2 cm; b = 1cm.

FIGURE 4. Microscopic structures of Truncospora wisconsinensis (drawn from the holotype). a Basidiospores.b Basidioles.c Cystidioles. d Hyphae from trama. e Hyphae from context. Bars: a = 5 μm; b–e = 10 μm.