Oligoporus podocarpi Y.C. Dai, Chao G. Wang & 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

Oligoporus podocarpi Y.C. Dai, Chao G. Wang & Yuan Yuan sp. nov.

Figs 5 , 6

Diagnosis.

Oligoporus podocarpi is characterised by soft fresh basidiocarps, becoming rigid upon drying, a monomitic hyphal system with hyaline clamped generative hyphae, the presence of apically encrusted cystidia, broadly ellipsoid to reniform, dextrinoid, cyanophilous basidiospores measuring 3.8-4.2 × 2-2.3 μm, and growing on rotten wood of Podocarpus .

Type.

China. Hainan, Changjiang , Hainan Tropical Rainforest National Park, Bawangling , rotten wood of Podocarpus imbricatus , 10.XI.2020, Yu-Cheng Dai leg., Dai 22042 (holotype BJFC035938) .

Etymology.

Podocarpi (Lat.): referring to the species growing on wood of Podocarpus imbricatus .

Fruiting body.

Basidiocarps annual, resupinate, adnate, soft corky, with mushroom odour when fresh, becoming rigid when dry, mild taste, up to 3 cm long, 2 cm wide and 2.3 mm thick at the centre. Pore surface snow white when fresh, becoming cream to buff upon drying, somewhat glancing; sterile margin indistinct, thinning out, up to 0.3 mm wide; pores round to angular, 5-6 per mm; dissepiments thin, entire. Subiculum white, fibrous to soft corky when dry, up to 0.3 mm thick. Tubes concolorous with the pore surface, hard corky to brittle when dry, up to 2 mm long.

Hyphal structure.

Hyphal system monomitic; generative hyphae with clamp connections, smooth, hyaline, IKI-, CB-; tissues unchanged in KOH.

Subiculum.

Generative hyphae thick-walled with a wide lumen, occasionally branched, flexuous, interwoven, 2.5-3.8 μm in diam.

Tubes.

Generative hyphae thin- to thick-walled, occasionally branched, subparallel along the tubes to loosely interwoven, 2-3.1 μm in diam. Cystidia present, ventricose, very thick-walled, some apically encrusted. Basidia short clavate, sometimes with an intermediate constriction, with four sterigmata and a basal clamp connection, 12.5-16 × 4-5 μm; basidioles in shape similar to basidia, but smaller.

Spores.

Basidiospores broadly ellipsoid to reniform, hyaline, thin- to slightly thick-walled, smooth, often with one guttule, dextrinoid, CB+, (3.5-)3.8-4.2(-4.5) × 2-2.3(-2.5) µm, L = 3.98 μm, W = 2.14 μm, Q = 1.82-1.90 (n = 90/3).

Type of rot.

Brown rot.

Additional specimens (paratypes) examined.

China. Hainan, Changjiang, Hainan Tropical Rainforest National Park, Bawangling; rotten wood of Podocarpus imbricatus , 10.XI.2020, Yu-Cheng Dai leg., Dai 22043 (BJFC035939) and Dai 22044 (BJFC035940).

Figures

Figure 5. Basidiocarps of Oligoporus podocarpi (holotype Dai 22042). Scale bar: 1.0 cm.

Figure 6. Microscopic structures of Oligoporus podocarpi (drawn from the holotype) a basidiospores b Basidia and basidioles c cystidia d hyphae from subiculum e hyphae from trama.