Arthrinium camelliae-sinensis M. Wang, F. Liu & L. Cai

Wang, Mei, Tan, Xiao-Ming, Liu, Fang & Cai, Lei, 2018, Eight new Arthrinium species from China, MycoKeys 34, pp. 1-24 : 1-3

Arthrinium camelliae-sinensis M. Wang, F. Liu & L. Cai sp. nov. Figure 4

Type.

CHINA, Jiangxi Province, on Camellia sinensis , 22 Apr. 2013, Q. Chen, (holotype: HMAS 247186; culture ex-type: CGMCC 3.18333 = LC5007).

Etymology.

Named with the host plant of the type.

Description.

Hyphae hyaline, branched, septate, 2.0-4.5 μm diam. Conidiophores reduced to conidiogenous cells. Conidiogenous cells erect, aggregated in clusters, hyaline to pale brown, smooth, doliiform to ampulliform, 4.0-9.5 × 3.0-6.0 μm (x̄ = 6.1 ± 1.4 × 4.4 ± 0.9, n = 30). Conidia brown to dark brown, smooth, globose to subglobose, 9.0-13.5 × 7.0-12.0 μm (x̄ = 11.1 ± 0.9 × 10.1 ± 1.0, n = 50).

Culture characteristics.

On PDA, colonies flat, margin circular, initially white, becoming greyish on surface, reaching 9 cm in 7 days at 25 °C. On MEA, with sparse aerial mycelia, surface dirty white, reverse pale luteous.

Other specimens.

CHINA, Hubei Province, on Brassica campestris , 31 Mar. 2016, Y.Z. Zhao, living culture LC8181 = LF1498.

Notes.

Two strains representing A. camelliae-sinensis clustered in a well-supported clade and appeared closely related to A. jiangxiense (97% sequence similarity in ITS; 94% in TUB2; 94% in TEF1) and A. obovatum (98% sequence similarity in ITS; 95% in TUB2; 93% in TEF1). While A. camelliae-sinensis is distinct from A. jiangxiense in its larger conidia (globose or subglobose, 9.0-13.5 × 7.0-12.0 μm in A. camelliae-sinensis vs. surface view 7.5-10.0 μm diam, side view 4.5-7.0 μm diam in A. jiangxiense ) and conidiogenous cell arrangement (aggregated irregularly on hyphae vs. scattered on hyphae in A. jiangxiense ) and distinct from A. obovatum in the lack of obovoid conidia (see the note under A. obovatum ).