Odontia aculeata Yuan Yuan, Y. C. Dai & H. S. Yuan 2018, sp. nov.
Creators: name: Yuan, Yuan
name: Wu, Fang
name: Dai, Yu-Cheng
name: Qin, Wen-Min
name: Yuan, Hai-Sheng
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Thelephorales
Thelephoraceae
Odontia
Odontia aculeata

description: Odontia aculeata Yuan Yuan, Y.C. Dai & H.S. Yuan, sp. nov. Figs. 2–4   
MycoBank no.: MB 823885.  
 Type:— CHINA. Liaoning Province, Qingyuan County, Ecological Station, on rotten angiosperm wood debris, 23.X.2015 Yuan 10793 (IFP, holotype).   
Etymology:— “Aculeata ” (Lat.), referring to the spine-like hymenophoral surface.  
 Diagnosis:—Differs from Odontia ferruginea by having shorter spines, thin- to slightly thick-walled subicular hyphae, a monomitic spine trama with clamped generative hyphae and absence of septa in basidia.   
 Description:— Basidiocarps annual, resupinate, easily separable from the substrate, arachnoid, continuous, without odor or taste when fresh, becoming cottony upon drying, up to 0.15 mm thick. Hymenophoral surface brown (6E7–6F8) when dry, hydnoid; spines conical, up to 1 mm long, 0.2–0.3 mm wide at the base, evenly distributed, 2–3 per mm, turning darker or concolorous with subiculum. Subiculum mostly brown. Sterile margin determinate, byssoid, concolorous with hymenophore. Rhizomorphs present in subiculum and margins, 30–100 μm diam; rhizomorph surface rather smooth; hyphal structure in rhizomorphs dimitic, differentiated, of type C (according to Agerer 1987 –2008), compactly arranged; generative hyphae in center of rhizomorph with clamp connections, thin-walled, 3–4 μm diam, colorless in KOH; skeletal hyphae at outer part of rhizomorph thick-walled, 1–2 μm diam, grayish yellow in KOH, cyanophilous, inamyloid.   
 Hyphal structure subicular hyphae monomitic, generative hyphae with clamp connections, thin- to slightly thick-walled, 2.5–4.5 μm diam, occasionally collapsed, without encrustation, grayish yellow in KOH, acyanophilous, inamyloid. Subhymenial hyphae with clamp connections, thin-walled, 2.5–5.5 μm diam; hyphal cells more or less uniform, colorless in KOH, cyanophilous, inamyloid. Spine tramal hyphae monomitic, generative hyphae with clamp connections, thin-walled, 2.5–3.5(–5) μm diam, grayish yellow in KOH, cyanophilous, inamyloid.   
 Hymenium cystidia and cystidioles absent. Basidia 12–15 μm long and 7–10 μm diam at apex, 4–5 μm at base, with a clamp connection at base, short-clavate, not stalked, not sinuous, without transverse septa, grayish yellow in KOH and in distilled water, bearing 4 sterigmata; sterigmata up to 6 μm long, 1–2 μm diam at base. Basidiospores 6.5–8.0(–8.7) × 5.1–7.2 μm in lateral and frontal face, L = 7.36 μm, W = 6.35 μm, Q = 1.16–1.21 (n = 60/2), irregular globose frontal and ellipsoid lateral face, oildrops absent, verruculose, light brown in KOH and in distilled water, acyanophilous, inamyloid; warts usually grouped in 2 or more, bi- to trifurcate, alike in shape, 0.2–0.5 μm long. Chlamydospore s absent.   
 Additional specimen (paratype) examined:— CHINA. Liaoning Province, Qingyuan County, Ecological Station, on rotten angiosperm wood debris, 23 October 2015 Yuan 10767 (IFP).
description: Published as part of 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, pp. 183-192 in Phytotaxa 372 (3) on pages 187-188, DOI: 10.11646/phytotaxa.372.3.1, http://zenodo.org/record/13728698