Odontia sparsa Yuan Yuan, Y.C. Dai & H.S. Yuan, 2018

Yuan, Yuan, Wu, Fang, Dai, Yu-Cheng, Qin, Wen-Min & Yuan, Hai-Sheng, 2018, Odontia aculeata and O. sparsa, two new species of tomentelloid fungi (Thelephorales, Basidiomycota) from the secondary forests of northeast China, Phytotaxa 372 (3), pp. 183-192 : 189-191

publication ID	https://doi.org/ 10.11646/phytotaxa.372.3.1
DOI	https://doi.org/10.5281/zenodo.13728982
persistent identifier	https://treatment.plazi.org/id/A215D93E-3204-B300-9DD0-98F1FC14DA58
treatment provided by	Felipe
scientific name	Odontia sparsa Yuan Yuan, Y.C. Dai & H.S. Yuan
status	sp. nov.

Treatment

Odontia sparsa Yuan Yuan, Y.C. Dai & H.S. Yuan View in CoL , sp. nov. Figs. 5–7 View FIGURE 5 View FIGURE 6 View FIGURE 7

MycoBank no.: MB 823886.

Type:— CHINA. Liaoning Province, Kuandian County, Baishilazi Nature Reserve, on fallen angiosperm branch, 22.X.2015 Yuan 10780 ( IFP, holotype).

Etymology:— “sparsa ” (Lat.), referring to hymenophoral surface with sparsely distributed spines.

Diagnosis:—Differs from Odontia ferruginea by having clamp connections on generative hyphae only in spine trama and simple-septate generative hyphae in rhizomorphs.

Description:— Basidiocarps annual, resupinate, easily separable from the substrate, arachnoid, continuous, without odor or taste when fresh, becoming cottony upon drying, up to 0.5 mm thick. Hymenophoral surface brown (6E6–6E8) when dry, smooth or hydnoid to the naked eye; spines conical, up to 0.8 mm long and 0.15–0.2 mm wide at the base, evenly distributed, 1–2 per mm, concolorous with subiculum. Subiculum brown. Sterile margin indeterminate, byssoid, concolorous with hymenophore. Rhizomorphs present in subiculum and margins, 20–60 μm diam; rhizomorphic surface rather smooth; hyphal structure in rhizomorph dimitic, differentiated, of type C (according to Agerer 1987 –2008), compactly arranged; generative hyphae in center of rhizomorph simple-septate, slightly thick-walled, 3–4.5 μm diam, colorless in KOH; skeletal hyphae at outer part of rhizomorph thick-walled, 1.2–1.8 μm diam, grayish yellow in KOH, cyanophilous, inamyloid.

Hyphal structure subicular hyphae dimitic, generative hyphae with clamp connections, thin-walled, 3–5 μm diam, occasionally collapsed, rarely branched, scarcely encrusted, grayish yellow in KOH; skeletal hyphae thick-walled, 1–2 μm diam, grayish yellow in KOH, acyanophilous, inamyloid. Subhymenial hyphae with clamp connections, thin-walled, 2–5 μm diam; hyphal cells more or less uniform, grayish yellow in KOH, cyanophilous, inamyloid. Spine tramal hyphae dimitic, generative hyphae with clamp connections, 2–3.5 μm diam, thin-walled, grayish yellow in KOH; skeletal hyphae thick-walled, 1–1.5 μm diam, grayish yellow in KOH, cyanophilous, inamyloid.

Hymenium cystidia and cystidioles absent. Basidia 12–20 μm long and 6–10 μm diam at apex, 3–5 μm at base, with a clamp connection at base, clavate, not stalked, not sinuous, rarely with transverse septa, grayish yellow in KOH and in distilled water, 4 sterigmata; sterigmata up to 5 μm long, 0.5–1 μm diam at base. Basidiospores 6.3–8.5(–8.7) × 5.2–7.6 μm in lateral and frontal face, L = 7.38 μm, W = 6.60 μm, Q = 1.11–1.18 (n = 60/2), irregular globose frontal and ellipsoid lateral face, oildrops absent, verruculose, reddish brown in KOH, brownish yellow in distilled water, acyanophilous, inamyloid; warts usually grouped in 2 or more, bi- or trifurcate, alike in shape, 0.3–0.8 μm long. Chlamydospores absent.

Additional specimen (paratype) examined:— CHINA. Liaoning Province, Kuandian County, Baishilazi Nature Reserve, on fallen angiosperm branch, 22 October 2015 Yuan 10718 ( IFP).