Fomitopsis bambusae Y.C. Dai, Meng Zhou & Yuan Yuan, 2021

Zhou, Meng, Wang, Chao-Ge, Wu, Ying-Da, Liu, Shun & Yuan, Yuan, 2021, Two new brown rot polypores from tropical China, MycoKeys 82, pp. 173-197 : 173

Fomitopsis bambusae Y.C. Dai, Meng Zhou & Yuan Yuan sp. nov.

Figs 3 , 4

Diagnosis.

Fomitopsis bambusae is characterised by resupinate to effused-reflexed or pileate, soft corky basidiocarps with bluish-grey pores, small pores measuring 6-9 per mm, cylindrical to oblong ellipsoid basidiospores measuring 4.2-6.1 × 2-2.3 μm and growing on dead bamboo.

Type.

China. Hainan, Haikou, Jinniuling Park , on dead bamboo, 18.XI.2020, Yu-Cheng Dai leg., Dai 22116 (holotype BJFC036008) .

Etymology.

Bambusae (Lat.): refers to the species growing on bamboo.

Fruiting body.

Basidiocarps annual, resupinate to effused-reflexed or pileate, separable from the substrate, without odour or taste and soft corky when fresh, corky and light in weight when dry. Pilei semicircular, projecting up to 1 cm, 1.5 cm wide and 5 mm thick at base; resupinate part up to 14 cm long, 6 cm wide and 2 mm thick at centre. Pileal surface bluish-grey when fresh, pale mouse-grey to greyish-sepia when dry, glabrous to slightly velutinate, rough, azonate; margin acute, incurved when dry. Pore surface bluish-grey to pale mouse-grey when fresh, becoming mouse-grey to dark grey when dry; sterile margin up to 1 mm wide; pores round to angular, 6-9 per mm; dissepiments thin, entire. Context white to cream, corky, up to 3.5 mm thick. Tubes paler than pore surface, corky, up to 1.5 mm long.

Hyphal structure.

Hyphal system dimitic; generative hyphae bearing clamp connections; skeletal hyphae IKI-, CB-; tissue unchanged in KOH.

Context.

Generative hyphae hyaline, thin- to slightly thick-walled, occasionally branched, 1.5-3 μm in diam.; skeletal hyphae dominant, hyaline, thick-walled with a narrow lumen to subsolid, occasionally branched, interwoven, 2-4.5 μm in diam.

Tubes.

Generative hyphae hyaline, thin- to slightly thick-walled, rarely branched, 1.5-2.5 μm in diam.; skeletal hyphae dominant, hyaline, thick-walled with a narrow lumen to subsolid, occasionally branched, flexuous, interwoven, 2-3 μm in diam. Cystidia absent; fusoid cystidioles present, hyaline, thin-walled, 11-18 × 2.5-4 μm. Basidia short clavate to barrel-shaped, bearing four sterigmata and a basal clamp connection, 13-19 × 4.5-5.5 μm; basidioles dominant, in shape similar to basidia, but smaller.

Spores.

Basidiospores cylindrical to oblong ellipsoid, hyaline, thin-walled, smooth, IKI-, CB-, (4-)4.2-6.1(-6.5) × (1.9-)2-2.3(-2.6) µm, L = 4.917 µm, W = 2.109 µm, Q = 2.26-2.41 (n = 90/3).

Type of rot.

Brown rot.

Additional specimens (paratypes) examined.

China. Hainan, Haikou, Jinniuling Park, on dead bamboo, 7.XI.2020, Yu-Cheng Dai leg., Dai 21942 (BJFC035841), 18.XI.2020, Dai 22104 (BJFC035996), Dai 22110 (BJFC036002) and Dai 22114 (BJFC036006).

Figures

Figure 3. Basidiocarps of Fomitopsis bambusae (holotype Dai 22116). Scale bar: 1.0 cm.

Figure 4. Microscopic structures of Fomitopsis bambusae (drawn from the holotype) a basidiospores b basidia c basidioles d cystidioles e hyphae from context f hyphae from trama.