Arthrinium bambusae M. Wang & L. Cai

Wang, Mei, Tan, Xiao-Ming, Liu, Fang & Cai, Lei, 2018, Eight new Arthrinium species from China, MycoKeys 34, pp. 1-24 : 1

Arthrinium bambusae M. Wang & L. Cai sp. nov. Figure 3

Type.

CHINA, Guangdong Province, on bamboo leaves, 10 Jul. 2016, D.W. Xiao, (holotype: HMAS 247187; culture ex-type: CGMCC 3.18335 = LC7106).

Etymology.

Named after the host of the holotype.

Description.

Hyphae hyaline, branched, septate, 1.5-5.0 μm diam. Conidiophores reduced to conidiogenous cells. Conidiogenous cells erect, aggregated in clusters on hyphae, hyaline to pale brown, smooth, doliiform to ampulliform, or lageniform, 4.0-12.0 × 3.0-7.0 μm (x̄ = 6.6 ± 1.8 × 4.8 ± 0.9, n = 30). Conidia olivaceous to brown, smooth to finely roughened, subglobose to ellipsoid, 11.5-15.5 × 7.0-14.0 μm (x̄ = 13.2 ± 0.8 × 11.4 ± 1.2, n = 50).

Culture characteristics.

On PDA, colonies flat, spreading, margin circular, with abundant aerial mycelia, surface and reverse white to grey. On MEA, colonies flat, spreading, surface and reverse brown to black.

Additional specimens examined.

CHINA, Jiangxi Province, on bamboo leaves, 10 Jul. 2016, Q. Xiong, living culture LC7246; Guangdong Province, on bamboo leaves, 10 Jul. 2016, D.W. Xiao, living culture LC7107; ibid. living culture LC7113; ibid. living culture LC7124; ibid. living culture LC7125; ibid. living culture LC7128.

Notes.

Seven strains representing A. bambusae clustered in a well-supported clade closely related to A. subroseum (98% sequence similarity in ITS; 92% in TUB2; 96% in TEF1). Arthrinium bambusae differs from A. subroseum in the morphology of conidiophore (reduced to conidiogenous cells in A. bambusae vs. erect or ascending, clustered in groups in A. subroseum ). Moreover, A. bambusae does not produce pigment on the PDA.