Ganoderma angustisporum J.H. Xing, B.K. Cui & Y.C. Dai

Xing, Jia-Hui, Sun, Yi-Fei, Han, Yu-Li, Cui, Bao-Kai & Dai, Yu-Cheng, 2018, Morphological and molecular identification of two new Ganoderma species on Casuarinaequisetifolia from China, MycoKeys 34, pp. 93-108 : 93

Ganoderma angustisporum J.H. Xing, B.K. Cui & Y.C. Dai sp. nov. Figs 2 a–b, 3

Diagnosis.

Ganoderma angustisporum is characterised by its sessile basidiomata, white pore surface, almond-shaped, slightly truncate and narrow basidiospores.

Holotype.

CHINA. Fujian Prov., Pingtan County, on living tree of Casuarina equisetifolia , 18 August 2016, Cui 13817 (BJFC!).

Etymology.

angustisporum (Lat.): referring to the narrow basidiospores.

Description.

Basidiomes annual, sessile and broadly attached, applanate, shell-shaped, projecting up to 13.5 cm, 10 cm wide and 1.1 cm thick at base, corky when fresh, becoming hard corky to woody hard upon drying. Pileal surface strongly laccate, reddish-brown to dark brown, with a thin crust, concentrically zonate or azonate; margin distinct, slightly obtuse. Pore surface white when fresh, turning light buff when dry; pores round to angular, 3-5 per mm; dissepiments slightly thick to thick, entire. Context corky, homogeneous, greyish-brown, bearing distinct concentric growth zones, black melanoid band present, up to 0.4 cm thick. Tubes woody hard, greyish-brown, up to 0.7 cm long. Hyphal system trimitic; generative hyphae bearing clamp connections; all the hyphae IKI–, CB+; tissues darkening in KOH. Pellis: pellis cells regularly arranged into a palisade; terminal cells clavate, yellowish to pale brown, thin-walled, occasionally with blunt outgrowth and protuberance in the apical or lateral parts, bearing a simple septum at base, moderately amyloid at maturity, 15-33 × 4-10 μm. Context generative hyphae colourless, thin-walled, bearing clamp connections, unbranched, 2-4.5 µm in diam; skeletal hyphae dominant, pale yellowish-brown, thick-walled to subsolid, frequently branched, interwoven, 3-6 µm in diam; binding hyphae abundant, pale yellowish-brown, thick-walled with a narrow lumen to subsolid, frequently branched, tortuous, interwoven, 1-2.5 µm in diam. Tubes generative hyphae colourless, thin-walled, bearing clamp connections, unbranched, slightly swollen at the distal end, 2-2.8 μm in diam; skeletal hyphae dominant, pale brown to distinctly brown, thick-walled with a medium or narrow lumen to subsolid, frequently branched, strongly interwoven, 3-4.5 μm in diam; binding hyphae brownish-yellow, thick-walled to almost solid, frequently branched, interwoven, 1-1.8 μm in diam. Basidia barrel-shaped, yellowish to pale brown, with a clamp connection and four sterigmata, 11-16 × 6.5-9 µm; basidioles pear-shaped to fusiform, 8-15 × 5-8 µm. Basidiospores mostly almond-shaped at maturity, slightly truncate, yellowish to pale brown, IKI–, CB+, double-walled, exospore smooth, endospore with coarse echinulate, (8 –)9–10.5(– 11) × (3.5 –)4– 5 µm, L = 8.89 μm, W = 4.27 μm, Q = 2.01-2.24 (n = 60/2, with the turgid vesicular appendix excluded); (8 –)9–11.3(– 12) × (3.8 –)4– 5.2 µm, L = 10.26 μm, W = 4.31 μm, Q = 2.36-2.4 (n = 60/2, with the turgid vesicular appendix included).

Type of rot.

A white rot.

Additional specimens examined.

CHINA. Guangdong Prov., Maoming, Dianbai, on living trees of Casuarina equisetifolia , 20 June 2017, Cui 14578, Cui 16494 and Cui 16495 (BJFC!).