Hymenochaetales » Hymenochaetaceae » Tropicoporus

Tropicoporus excentrodendri

Tropicoporus excentrodendri L.W. Zhou & Y.C. Dai 2015, in Zhou et al., Fungal Diversity, 77, 335-347 (2016)

Etymology: excentrodendri (Lat.): refers to the host genus Excentrodendron.

Diagnosis: Basidiocarps annual, resupinate, effused-reflexed to distinctly pileate, imbricate. Pileal surface tomentum to hispid, concentrically sulcate; margin obtuse, tomentose to hispid. Pores circular to angular, 78 per mm; dissepiments thick, entire. Context duplex with a black line. Hyphal system dimitic in both context and trama; hyphae unchanged in KOH. Hymenial setae occasionally present, 2025×58 μm. Basidiospores broadly ellipsoid to subglobose, pale yellowish, slightly thick-walled, IKI, CB, 3.44×2.93.6 μm.

Basidiocarps annual, resupinate, effused-reflexed to distinctly pileate, imbricate, without odour or taste and woody hard when fresh, woody hard and light in weight when dry. Pilei dimidiate, projecting up to 2 cm, 4.5 cm wide and 0.7 cm thick at base. Pileal surface vinaceous brown to fuscous, tomentum to hispid, concentrically sulcate; margin obtuse, hispid, yellow-brown to honey-yellow. Pore surface buff to honey-yellow, glancing; sterile margin distinct, honey-yellow, up to 3 mm; pores circular to angular, 78 per mm; dissepiments thick, entire. Context woody hard, up to 2 mm, duplex, with a black line between upper tomentum part and lower hard context, upper tomentum yellow- brown, soft, up to 1 mm thick, lower context cinnamonbuff, woody hard, up to 1 mm thick. Tubes curry-yellow, woody hard, up to 5 mm long; white mycelial strands occasionally present in old tubes. Hyphal system dimitic; generative hyphae simple septate; tissue darkening but otherwise unchanged in KOH. Context. Generative hyphae pale yellowish, thick-walled, occasionally branched, frequently septate, straight, 23.5 μm in diam.; skeletal hyphae yellowish, distinctly thick-walled with a narrow lumen, unbranched, aseptate, straight, 35 μm in diam., more or less regularly arranged. Hyphae in the tomentum or hispid similar to those in context, but loosely interwoven. Tubes. Generative hyphae hyaline to pale yellowish, slightly thick-walled, unbranched, frequently septate, 2.53.5 μm in diam.; skeletal hyphae dominant, yellowish, thick-walled with a wide to narrow lumen, unbranched, aseptate, subparallel along the tubes, 34.5 μm in diam. Hymenial setae occasionally present, ventricose, dark brown, thick-walled, with a sharp or obtuse tip, 2025×58 μm; cystidia and cystidioles absent; basidia barrel-shaped, with four sterigmata and a simple septum at the base, 1015×47 μm; basidioles in shape similar to basidia, but slightly smaller; rhomboid crystals abundant. Basidiospores broadly ellipsoid to subglobose, pale yellowish, slightly thick-walled, smooth, IKI, CB, (3.2–)3.44(−4.2)×(2.7–)2.93.6(−3.8) μm, L=3.74 μm, W=3.21 μm,Q=1.161.17 (n=60/2).

Index Fungorum Number: IF812155