Arthrinium subroseum 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 : 8-10

Arthrinium subroseum M. Wang & L. Cai sp. nov. Figure 10

Type.

CHINA, Jiangxi Province, on bamboo, 1 Jul. 2016, J.E. Huang, (holotype: HMAS 247190; culture ex-type: CGMCC3.18337 = LC7292).

Etymology.

Named after the colour of colony on PDA, pinkish.

Description.

Hyphae hyaline to pale brown, branched, septate, 1.5-6.0 μm diam. Conidiophores hyaline to pale brown, smooth, erect or ascending, simple, flexuous, subcylindrical, clustered in groups. Conidiophores aggregated in brown sporodochia, smooth, hyaline to brown, up to 20 μm long, 2-4.5 μm width. Conidiogenous cells pale brown, smooth, doliiform to subcylindrical, 3.0-6.5 × 2.0-5.0 μm (x̄ = 4.7 ± 1.2 × 3.7 ± 0.9, n = 30). Conidia pale brown to dark brown, smooth, globose to subglobose or ellipsoidal, 12.0-17.5 × 9.0-16.0 μm (x̄ = 14.9 ± 1.4 × 11.8 ± 1.8, n = 50).

Culture characteristics.

On PDA, colonies flat, spreading, margin circular, with moderate aerial mycelia, initially white, becoming light pink on surface, reverse peach-puff without patches, reaching 10 cm in 8 days at 25 °C. On MEA, surface blackish-green with abundant mycelia, reverse with patches of greyish.

Other specimens.

CHINA, Jiangxi Province, on bamboo, 1 Jul. 2016, J.E. Huang, living culture LC7215; ibid. living culture LC7291.

Notes.

Three strains representing A. subroseum clustered in a well-supported clade, closely related to A. garethjonesii (94% sequence similarity in ITS) and A. bambusae (98% sequence similarity in ITS; 92% in TUB2; 96% in TEF1). However, A. subroseum differs from A. bambusae in the morphology of conidiophores (erect or ascending, clustered in groups in A. subroseum vs. reduced to conidiogenous cells in A. bambusae ). Arthrinium subroseum is not morphologically comparable to A. garethjonesii , whose asexual morph is undetermined ( Dai et al. 2016b).