Onnia kesiya M. Zhou & F.Wu, 2018

Zhou, Meng & Wu, Fang, 2018, A new species of Onnia (Hymenochaetales, Basidiomycota) from Vietnam, Phytotaxa 349 (1), pp. 73-78 : 74-76

publication ID

https://doi.org/ 10.11646/phytotaxa.349.1.9

DOI

https://doi.org/10.5281/zenodo.13709455

persistent identifier

https://treatment.plazi.org/id/2D1D87BF-FFE5-5462-7FF9-F884FE47FE1E

treatment provided by

Felipe

scientific name

Onnia kesiya M. Zhou & F.Wu
status

sp. nov.

Onnia kesiya M. Zhou & F.Wu , sp. nov. ( Figs. 2–3)

MycoBank no.—MB 823451

Diagnosis.—It differs from other Onnia species by its wide basidiospores (> 4 μm in width, <4 μm in other species).

Type.— Vietnam, Lam Dong Province, Bidoup Nui Ba National Park, alt. 1700 m, on root of living Pinus kesiya , 16 Oct. 2017, Y.C. Dai 18415 (holotype in BJFC).

Etymology.— Kesiya (Lat.) : referring to the host Pinus kesiya .

Basidiocarps.—Basidiocarps annual, laterally stipitate, solitary, corky to leathery without odour when fresh, hard corky upon drying. Pilei dimidiate to fan-shaped, projecting up to 8 cm long, 4 cm wide and 9 mm thick at base. Pileal surface cinnamon-buff to olivaceous, buff or reddish brown at margin, distinctly concentrically zonate, cinnamon-buff when dry, distinctly velutinate, concentrically zonate; margin sharp, curved down when dry. Pore surface grayish white when fresh, grayish white to grayish brown when dry; pores mostly angular, irregular with age, 1–3 per mm; dissepiments thin, slightly lacerate. Context duplex, upper layer cinnamon-buff, spongy, up to 2 mm thick, lower layer honey-yellow, hard corky, up to 4 mm thick, a demarcation zone between the two layers indistinct. Tubes pinkish buff, paler than context, hard corky to brittle, up to 3 mm long. Stipe very long, up to 5 cm and 5 mm in diam, distinctly tomentose.

Hyphal structure.—Hyphal system monomitic, generative hyphae simple septate, IKI-, CB-; tissue darkening but otherwise unchanged in KOH.

Context.—Hyphae in upper layer pale yellowish to golden yellow, thin-walled, rarely branched with frequent simple septa, loosely interwoven, 4–7 μm in diam; hyphae in the lower layer yellowish to golden brown, thin- to slightly thick-walled, occasionally branched with frequent simple septa, regularly arranged, more or less agglutinated, 4–6 μm in diam; hyphae in stipe similar to those in context.

Tubes.—Tramal hyphae hyaline to yellowish, thin- to slightly thick-walled, occasionally branched and frequently septate, loosely interwoven, slightly agglutinated, 2.5–3.5 μm in diam. Hymenial setae hooked, sharp-pointed, dark brown, thick-walled, very deep-rooting, 50–130 × 10–20 μm; cystidia and cystidioles absent; basidia clavate, with four sterigmata and a simple septum at the base, 12–23 × 4–6 μm; basidioles dominant, in shape similar to basidia, but distinctly smaller.

Spores.—Basidiospores ellipsoid, hyaline, thin-walled, smooth, some with a big guttule, IKI-, CB-, (5.3–)5.8– 6.5(–7) × 4–4.7(–5) μm, L = 6.11 μm, W = 4.37 μm, Q = 1.4 (n = 30/1).

Type of rot.—White rot.

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