Odontoefibula orientalis C.C. Chen & Sheng H. Wu

Chen, Che-Chih, Wu, Sheng-Hua & Chen, Chi-Yu, 2018, Hydnophanerochaete and Odontoefibula, two new genera of phanerochaetoid fungi (Polyporales, Basidiomycota) from East Asia, MycoKeys 39, pp. 75-96 : 75

Odontoefibula orientalis C.C. Chen & Sheng H. Wu sp. nov. Figs 3band 5

Holotype.

CHINA. Beijing: Xiangshan Park, 39°59'N, 116°11'E, 70 m alt., on fallen trunk of Amygdalus davidiana ( Carrière) de Vos ex Henry, leg. S.H. Wu, 14 Oct 2009, Wu 0910-57 (TNM F23847).

Etymology.

From orientalis (= Eastern world), where the specimens were collected.

Description.

Basidiocarps annual, effused, adnate, membranaceous to subceraceous, somewhat brittle, 200-400 μm thick in section (aculei excluded). The hymenial surface at first honey yellow, darkening to ochraceous to pale brown with age, turning dark reddish in KOH, slightly tuberculate when young, becoming odontioid with age, extensively cracked; margin paler, thinning out, slightly filamentous. Aculei conical to cylindrical, usually fused at the base, with rounded to obtuse apex, 3-6 per mm, ca. 0.1-0.3 × 0.1-0.2 mm.

Hyphal system monomitic; hyphae simple-septate. Subiculum uniform, with dense texture, 200-300 μm thick; subicular hyphae somewhat vertical, colourless, 2.5-4 μm diam., 0.5-0.8 μm thick walls; hyphae near substratum interwoven, with irregular orientation, tortuous, colourless, irregularly swollen, 4-8 μm diam., 0.5-1 μm thick walls. Subhymenium not clearly differentiated from subiculum, with fairly dense texture, hyphae somewhat vertical, colourless, 3-4 μm diam., thin- to slightly thick-walled. Trama of aculei of dense texture; hyphae mainly vertical, other aspects similar to those in subiculum. Large crystal masses scattered throughout the section. Cystidia lacking, but projecting hyphal ends in the hymenium may be present. Basidia clavate to narrowly clavate, 25-40 × 6-7 μm, 4-sterigmate, often with small oily drops. Basidiospores ellipsoid, adaxially slightly concave, smooth, thin-walled, sometimes with small oily drops, inamyloid, non-dextrinoid, acyanophilous, 5.1-6.6 × 2.8-3.4 μm (Table 2).

Habitat.

On fallen trunk of angiosperm (e.g. Amygdalus ).

Distribution.

Hitherto known from China (Beijing), Japan and Taiwan.

Additional specimens examined (paratypes).

JAPAN. Honshu: Ibaraki Prefecture, Joso City, Mt. Ju-ichimen-yama, along Kinu-gawa River, on branch of Prunus sp., leg. S.H. Wu, 12 July 2008, Wu 0807-53 (TNM F22091). TAIWAN. Pingtung: Laiyi Township, Pengjishan Trail, 22°30 ’52” N, 120°38 ’07” E, 248 m alt., on fallen trunk of angiosperm, leg. C.C. Chen, 25 Mar 2017, GC 1703-76 (TNM F31460). Taichung: Hoping District, between 27-27.5 km of Dasyueshan Forestry Road, Yuanzueishan Trail, 1800 m alt., on fallen rotten trunk of angiosperm, leg. S.H. Wu, S.Z. Chen & Y.T. Wang, 22 May 2008, Wu 0805-59 (TNM F22495). Hualien: Sioulin Township, Taroko National Park, Lushui Hiking Trail, 24°10 ’51” N, 121°30 ’10” E, 578 m alt., on fallen trunk of angiosperm, leg. C.C. Chen, 24 Apr 2016, GC 1604-130 (TNM F31364).