Fuscoporia hainanensis Q. Chen & Y.C. Dai, 2022

Chen, Qian, Liu, Lu, Zhang, De-Shun & Dong, Li-Li, 2022, Fuscoporia hainanensis sp. nov. (Hymenochaetales, Basidiomycota), a new member of the F. contigua group, Phytotaxa 558 (3), pp. 251-262 : 257-258

Fuscoporia hainanensis Q. Chen & Y.C. Dai , sp. nov. ( Figs. 3 , 4 )

MycoBank no.—MB 844096

Holotype. — CHINA. Hainan Provinces, Lingshui Country, Diaoluoshan Forest Park , on fallen angiosperm branch, 13 November 2015, Dai 16105 ( BJFC 020198 ).

Etymology.— Hainanensis (Lat.) : in reference to the distribution of the species in the Hainan.

Fruiting body.—Basidiocarps annual, resupinate, separable, adnate, effused, without odor or taste when fresh, light-weight, and hard corky when dry, up to 20 cm long, 3 cm wide and 1 mm thick at centre. Pore surface greyish brown, not fawn, cracked when dry, sterile margin matted, distinctly darker rusty color than the pore surface because of masses of setae covering the margin, up to 3 mm wide; pores more or less circular to irregular, 4–6 per mm; dissepiments thin, entire to slightly lacerate, usually cover setae, abundant setae seen in tube cavities. Subiculum clay-buff, corky, very thin, less 0.1 mm thick. Tubes olivaceous buff, paler contrasting with pores and subiculum, hard corky, and up to 1 mm long.

Hyphal structure. —Hyphal system dimitic; generative hyphae simple septate; tissue darkening but otherwise unchanged in KOH.

Subiculum.— Generative hyphae infrequent, hyaline, thin-walled, occasionally branched and simple septate, 2.2– 3.0 μm in diam; skeletal hyphae dominant, rust-brown, thick-walled with a narrow to medium lumen, unbranched, aseptate; flexuous to more or less straight, loosely interwoven, 3.0–3.8 μm in diam; mycelial setae frequent, dark reddish brown, thick-walled, tapering to apex, usually in the subiculum, in the wood crevices, on the surface of margin and under the basidiomes, basidiome bruised, sometimes locally abundant, up to 130 μm long and 5–6 μm in the widest part.

Tubes. —Generative hyphae infrequent, mostly present at dissepiment edges and subhymenium, hyaline, thinwalled, occasionally branched and simple septate, 2.2–3 μm in diam, some of them at dissepiment edges and in hymenium encrusted; skeletal hyphae dominant, yellowish brown, thick-walled with a wide lumen, unbranched, aseptate, more or less straight, strongly interwoven, 3–3.5 μm in diam. Hymenial setae frequent, mostly originating from hymenium and dissepiments, subulate, tapering to apex, dark brown, thick-walled, 30–50 × 4–8 μm; fusoid cystidioles infrequent, hyaline and thin-walled, sometimes covered with crystals; basidia clavate, with four sterigmata and a simple septum at the base, 9–13 × 4.0–6.2 μm; basidioles dominating in hymenium, in shape similar to basidia, but slightly smaller; secondary hyphae usually present in tubes, hyaline, thin- walled, occasionally branched and septate, 1.8–2.5 μm in diam, strongly encrusted by stellate crystals.

Spores. —Basidiospores cylindric, hyaline, thin-walled, smooth, usually massively glued in the secondary hyphae tip and hymenial setae, IKI–, CB–, bearing a guttule or not, (4.8–)5.0–6.2(–) × (2.2–)2.3–3.0(–3.1) μm, L = 5.59 μm, W = 2.65 μm, Q = 2.06–2.18 (n = 60/2).

Other specimens examined.— CHINA. Hainan Province, Lingshui Country, Diaoluoshan Forest Park, on fallen angiosperm branch, 13 November 2015, Dai 16110 ( BJFC020203 ) .

Figures

FIGURE 3. Microscopic structures of Fuscoporia hainanensis (holotype, Dai 16105). a. Basidiospores. b. Basidia and basidioles. c. Cystidioles. d. Hymenial setae. e. Mycelial setae. f. Generative hyphae at dissepiment edge. g. Hyphae from tube trama. h. Hyphae from subiculum.Drawing by: Qian Chen.

FIGURE 4. Basidiocarps of Fuscoporia hainanensis (holotype, Dai 16105). – Bar = 10 mm. Photo by: Qian Chen.