Ganoderma casuarinicola 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 casuarinicola J.H. Xing, B.K. Cui & Y.C. Dai sp. nov. Figs 2 c–d, 4

Diagnosis.

Ganoderma casuarinicola is characterised by its strongly laccate reddish-brown pileal surface, white pore surface, luminous yellow to yellowish-brown cutis.

Holotype.

CHINA. Guangdong Prov. Zhanjiang, Dianbai, on living tree of Casuarina equisetifolia , 4 October 2015, Dai 16336 (BJFC!).

Etymology.

casuarinicola (Lat.): referring to the host tree genus Casuarina .

Description.

Basidiomes annual, stipitate to substipitate, pileus sectorial to shell-shaped, projecting up to 10 cm, 7 cm wide and 2 cm thick at base, corky, without odour when fresh, becoming hard corky to woody hard when dry. Pileal surface strongly laccate, reddish-brown, with a thin crust; margin obtuse, cream to reddish-brown. Stipe flattened or subcylindrical, lateral, reddish-brown, up to 6 cm long and 1.7 cm in diam. Pore surface white when fresh, turning cream when dry; pores round to angular, 4-6 per mm; dissepiments thin to slightly thick, entire. Context corky, heterogeneous, the upper layer generally light yellow up to 0.1 cm thick and the lower layer generally dark brown close to the tubes up to 1 cm thick, showing distinct concentric growth zones, black melanoid band absent. Tubes woody hard, greyish-brown, up to 0.9 cm long. Hyphal system trimitic; generative hyphae bearing clamp connections, occasionally with simple septa; all the hyphae IKI–, CB+; tissues darkening in KOH. Pellis: Pellis cells regularly arranged into a palisade; terminal cells clavate, luminous yellow to yellowish-brown, thick-walled, occasionally expanded at the apex, moderately amyloid at maturity, 40-70 × 5-13 μm. Context generative hyphae colourless, thin-walled, with clamp connections, occasionally branched, 2-4 µm in diam; skeletal hyphae dominant, pale yellowish-brown, thick-walled to subsolid, frequently branched, interwoven, 3-5.5 µm in diam; binding hyphae abundant, pale yellowish-brown, thick-walled with a narrow lumen to subsolid, frequently branched, tortuous, interwoven, 1-3 µm in diam. Tubes generative hyphae colourless, thin-walled, mostly bearing clamp connections, occasionally with simple septa, occasionally branched, slightly swollen at the distal end, 1.5-3 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, 2-4.5 μm in diam; binding hyphae brownish-yellow, thick-walled to almost solid, frequently branched, interwoven, 1.5-2.5 μm in diam. Basidia barrel-shaped, yellowish to pale brown, with a clamp connection and four sterigmata, 12-18 × 9.5-13 µm; basidioles pear-shaped, 9-16 × 8-12 µm. Basidiospores mostly ellipsoid at maturity, truncate, yellowish to pale brown, IKI–, CB+, double-walled, exospore smooth, endospore with coarse echinulate, (8 –)8.5– 9 (-10) × (4.2 –)5.5–6.5(– 7) µm, L = 8.82 μm, W = 5.65 μm, Q = 1.52-1.60 (n = 60/2, with the turgid vesicular appendix excluded); (8.3 –)9–10.2(– 11.5) × (4.5 –)5–6(– 7) µm, L = 9.85 μm, W = 5.77 μm, Q = 1.68-1.72 (n = 60/2, with the turgid vesicular appendix included).

Type of rot.

a white rot.

Additional specimens examined.

CHINA. Guangdong Prov., Zhanjiang, Dianbai, on living trees of Casuarina equisetifolia , 4 October 2015, Dai 16337, Dai 16338, Dai 16339, Dai 17892, Cui 16370, Cui 16376 and Cui 16377 (BJFC!).