TangXiaGoonasekaraIshani D.JayawardenaRuvishika S.JiangHong BoLiJun F.HydeKevin D.KangJi C.Arthrinium bambusicola (Fungi, Sordariomycetes), a new species from Schizostachyum brachycladum in northern ThailandBiodivers Data J14122020810.3897/BDJ.8.e58755FB1F54D9-CA01-58E5-BECB-BC1495B4EE76Arthrinium bambusicolaX. Tang, K.D. Hyde & J.C. Kang, 2020sp. nov.Materials

Type status: Holotype. Occurrence: recordedBy: Xia Tang; Taxon: scientificName: Arthrinium bambusicola; kingdom: Fungi; phylum: Ascomycota; class: Sordariomycetes; order: Amphisphaeriales; family: Apiosporaceae; genus: Arthrinium; Location: country: Thailand; countryCode: TH; stateProvince: Chiang Rai; locality: Mae Fah Luang University; Identification: identifiedBy: Xia Tang; dateIdentified: 2019; Event: year: 2019; month: May; day: 7; habitat: terrestrial; fieldNotes: on dead culms of Schizostachyum brachycladum; Record Level: type: Holotype; collectionID: MFLU 20-0528; collectionCode: M19050706

Description

Saprobic on dead culms of Schizostachyum brachycladum (Poales, Poaceae, Bambusoideae). Sexual morph: Undetermined. Asexual morph: Colonies on natural substrate, superficial, gregarious, scattered, irregular, dark brown to black (Fig. 1a-b). Mycelium consisting of branched, septate, hyaline to dark brown (Fig. 1c-e). Conidiophores 0.8–3.5 μm diam. semi-micronematous to macronematous, mononematous, solitary, branched, flexuous, smooth, hyaline, aseptate when immature, becoming brown, septate when mature (Fig. 1d). Conidiogenous cells 1.5–4.5 × 1–4 μm, monoblastic or polyblastic, terminal, determinate, cylindrical, hyaline to light brown, smooth, aggregated, ampulliform, in clusters on aerial mycelium (Fig. 1e-g). Conidia pleurogenous, solitary, oval to broadly round or irregularly round, brown to medium brown, guttulate to roughened, granular, in surface view 6–8 × 6–7.8 μm (x̅ = 6.5 × 7 μm, n = 39), in lateral view 3.5–6 × 3.5–6.5 μm (x̅ = 4.5 × 5 μm, n = 39), with finely pale slit at outer edge (Fig. 1h-l).

Culture characteristics

colonies flat, spreading, with moderate, pale, aerial mycelium. On PDA, surface white, lightly yellow with patches of dirty white, reverse lightly pigmented.

Facesoffungi number

FoF 09162

Etymology

Referring to the host from which the holotype was isolated, a member of the bamboo subfamily (Bambusoideae).

Notes

Arthrinium bambusicola forms were retrieved as a sister taxon of A. gutiae, with relatively good support (83 ML, 77 MP, 0.99 PP). Morphologically, A. bambusicola differs from A. gutiae in having larger conidia [surface view: 5.5–8 × 6–8 μm diam., lateral view: 3.5–6 × 3.5–6.5 μm diam. versus surface view: 4.5–6 μm (x̅ = 5.5 μm) diam., lateral view: 2–6 μm (x̅ = 4) diam.] and irregularly rounded, guttulate to roughened conidia (A. gutiae: smooth-walled, globose conidia). The conidiogenous cells of A. bambusicola are smaller (1.5–4.5 × 1–4 μm versus 3–7× 2–4 μm). Based on pairwise nucleotide comparisons, A. bambusicola is different from A. gutiae in 31/ 620 bp (5%) of the ITS, 7/814 (0.98%) of the LSU and 44/342 bp (12%) of TEF1. Based on the combination of morphological characters and sequence data, we consider A. bambusicola as a distinct species.

D9F231FB-AC4B-5251-9492-7CDDC7DDF21A10.3897/BDJ.8.e58755.figure1

Arthrinium bambusicola (MFLU 20-0528, holotype). a, b. Appearance of the fungus on dead culms of Schizostachyum brachycladum; c. Conidia with mycelia; d. Mycelia; e–f. Mycelia bearing conidiogenous cells and conidia; h–l. Conidia; m. Germinated conidium; n. forward culture; o. reversed culture. Scale bars: b = 500 μm, c–e = 20 μm, f, g = 10 μm, h–m = 5 μm.

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