Pyrofomes lagerstroemiae Jing Si & Hai J. Li, 2023

Tang, Lu-Xin, Zhang, Yi-Zhe, Liang, Jia-Qi, Jiang, Shao-Feng, Si, Jing & Li, Hai-Jiao, 2023, Pyrofomes lagerstroemiae (Polyporaceae, Basidiomycota), a new species from Hubei Province, Central China, Phytotaxa 583 (2), pp. 191-198 : 194-196

Pyrofomes lagerstroemiae Jing Si & Hai J. Li , sp. nov. ( Figs. 3 , 4 )

MycoBank no.—846805

Etymology:— Lagerstroemiae (Lat.): refers to the host tree genus Lagerstroemia .

Diagnosis:—This species notably has at first hemispherical, later triquetrous basidiomata, big pores (1–2.5 per mm), subglobose to broadly ellipsoid basidiospores (5–6.2 × 4–5.4 µm), and is gregarious on Lagerstroemia indica .

Habitat and distribution:—Gregarious on dead part of living Lagerstroemia indica trunk, at present only discovered from its type locality with three collections, mid-summer.

Type:— CHINA. Hubei Province, Yichang, Development area , Development Avenue, No. 56, 14 August 2018, Li20180814-01 (Holotype). GenBank accession numbers: ITS: OP942411 and LSU: OQ195123 .

Description:— Basidiomata perennial, at first hemispherical, later triquetrous, broadly attached, without odor or taste when fresh, hard corky upon drying. Pileus greyish brown to fuscous, concentrically sulcate, glabrous, usually covered with green algae, projecting up to 6 cm, 12 cm broad, and 9.5 cm thick at base; pileal edge blunt, cream to buff, concolorous with pore surface or slightly paler, often covered by incomplete, shallow pores. Pore surface cinnamon buff to greyish brown, pores round to angular, 1–2.5 per mm; dissepiments thin to moderate, entire. Context cinnamon buff to greyish brown, corky, zonate, up to 8 cm thick. Tubes concolorous with context, distinctly stratified, hard corky, up to 1.8 cm long.

Hyphal structure:—Hyphal system trimitic, generative hyphae with clamp connections, hyphae IKI–, CB+, tissue unchanged in KOH.

Context:—Generative hyphae infrequent, hyaline, thin-walled, branched, 2–3 µm in diam; skeletal hyphae dominant, pale yellowish brown, thick-walled with a wide to narrow lumen, rarely branched, interwoven, 2.3–4 µm in diam; binding hyphae pale yellowish brown, often branched, thick-walled to subsolid, interwoven, 1–2 µm in diam.

Tubes:—Generative hyphae infrequent, hyaline, thin-walled, branched, 1.8–3 µm in diam; skeletal hyphae dominant, pale yellowish brown, thick-walled with a wide to narrow lumen to subsolid, rarely branched, interwoven to more or less parallel the tubes, 1.8–3.2 µm in diam, binding hyphae pale yellowish brown, often branched, thickwalled to subsolid, interwoven, 0.5–2 µm in diam. Cystidia absent, fusoid cystidioles present, hyaline, thin-walled, 15–22 × 5–7 µm. Basidia clavate, with four sterigmata and a basal clamp connection, 15–30 × 6–9 µm; basidioles in shape similar to basidia, but slightly smaller.

Basidiospores:—mostly subglobose to broadly ellipsoid, sometimes globose or ellipsoid, truncate, pale yellowish, thick-walled, smooth, IKI–, CB+, [120/3/3] 5–6.2(–7) × 4–5.4(–5.8) µm, L = 5.74 µm, W = 4.73 µm, Q = (1.02–)1.09– 1.38(–1.5), Q m = 1.22 ± 0.05.

Additional specimens examined (paratypes):— CHINA. Hubei Province, Yichang, Development area,Development Avenue, No. 56, 14 August 2018, Li20180814-02 , Li20180814-03 . GenBank accession numbers: ITS: OP942412 and OP942413 , LSU: OQ195124 and OQ195125 .

Figures

FIGURE 3. Basidiomata of Pyrofomes lagerstroemiae (Bars = 3 cm).

FIGURE 4. Microscopic structures of Pyrofomes lagerstroemiae (20180814-01, holotype). a Basidiospores. b Basidia and basidioles. c Cystidioles. d Generative hyphae from tube trama. e Skeletal hyphae from tube trama. f Binding hyphae from tube trama. (Bars: a = 5 µm, b–f = 10 µm). Drawings by Hai-Jiao Li.