Oxychaete cervinogilva (Jungh.) Miettinen

Miettinen, Otto, Spirin, Viacheslav, Vlasak, Josef, Rivoire, Bernard, Stenroos, Soili & Hibbett, David S., 2016, Polypores and genus concepts in Phanerochaetaceae (Polyporales, Basidiomycota), MycoKeys 17, pp. 1-46 : 15

Oxychaete cervinogilva (Jungh.) Miettinen comb. nov. Figure 7

Polyporus cervinogilvus Jungh., Praemissa in floram cryptogamicam Javae insulae: 45 (1838).

Description.

Basidiocarp half-resupinate to pileate, annual, upper surface felt-like, yellowish brown with a lighter margin, lower surface brownish yellow or light ochraceous, 1-2 mm thick, caps projecting up to 3 cm, can fuse to form wide fruiting bodies. Consistency light cardboard-like when dry, somewhat flexible but easy to break apart. Pores regular, thin-walled, mouths rather smooth, (1)2-3 per mm. Cap context and subiculum yellowish brown, homogenous, upper surface not differentiated, up to 1 mm thick. Cap with a sharp, 1 mm wide sterile margin.

Hyphal system monomitic, clamps absent. Hyphae homogenous throughout, mostly thick-walled, always with a wide lumen, rather stiff and straight, CB− to CB(+), IKI−, KOH−, CRB lilac. Encrustation absent except on cystidia. Subicular hyphae interwoven, loosely arranged, (3.2)4-5.4(7.5) µm in diameter, walls up to 1.5 µm thick, mostly ≤1 µm. Contextual hyphae mostly horizontally arranged but not strictly parallel, (3.8)4-5.1(5.5) µm in diameter. Tramal tissue loose and easy to study, hyphae rather straight, parallel in lower trama, subparallel and interwoven towards subiculum, (3)3.5-4.8(6.2) µm in diameter, walls mostly 0.8-1.2 µm thick. Subhymenial hyphae thin- to slightly thick-walled, richly branching mostly like a corymb, not much winding.

Cystidia abundant, hymenial, thick-walled, often with an apical crystal cap, (15)20 –40(55)×4.5– 9, projecting 5-25 µm above hymenium.

Hymenium dominated by basidioles and cystidia, cells with constrictions especially in older basidiocarps. Basidia cylindrical to narrowly clavate, collapsing upon spore release and difficult to spot, with 4 sterigmata. Cystidioles absent.

Basidiospores cylindrical, curved, thin-walled, smooth, (5.9)6 –8.4(8.9)×2.8– 3.7(3.8) µm, L=6.93 µm, W=3.17 µm, Q’=(1.8)1.9– 2.5(2.6), Q=2.19, CB−, IKI−, plasma stains in CB.

Distribution.

Tropical Asia and Australia ( Ryvarden and Johansen 1980). Not common in Indonesia although described from there.

Ecology.

Apparently prefers small-diameter dead wood of angiosperms. According to the description, the type was collected in a wet, shady forest in Javanese mountains. Australian collections we have seen are from drier localities (monsoon forest and city park).

Remarks.

Junghuhn (1838) provides a good painting of the species (Tab. IX), available through Google books (https://books.google.fi/books?id=AFJUAAAAcAAJ).