Arthrinium jiangxiense 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 : 5-6

Arthrinium jiangxiense M. Wang & L. Cai sp. nov. Figure 7

Type.

CHINA, Jiangxi Province, on Maesa sp., 05 Sept. 2013, Y.H. Gao, (holotype: HMAS 247183; culture ex-type: CGMCC3.18381 = LC4577).

Etymology.

Named after the province where the most strains of this species were collected, Jiangxi.

Description.

Hyphae hyaline, branched, septate, 1.5-5.0 μm diam. Conidiophores reduced to conidiogenous cells. Conidiogenous cells erect, scattered or aggregated in clusters on hyphae, hyaline to pale brown, smooth, ampulliform, 6.0-15.0 × 2.5-5.0 μm (x̄ = 9.7 ± 2.6 × 3.7 ± 0.6, n = 30), apical neck 2.5-6.0 μm long, basal part 3.0-9.0 μm long. Conidia brown, smooth to finely roughened, granular, globose to ellipsoid in surface view, 7.5-10.0 μm diam (x̄ = 8.7 ± 0.6, n = 50), lenticular in side view, with longitudinal, pale germ slit, 4.5-7.0 μm diam (x̄ = 5.8 ± 0.6, n = 50). Sterile cells forming on solitary loci on hyphae, brown, finely roughened, subcylindrical to clavate.

Culture characteristics.

On PDA, colonies flat, woolly, margin circular, with sparse aerial mycelia, initially white, becoming greyish due to sporulation, reaching 9 cm in 10 days at 25 °C, on MEA, sienna with patches of luteous, reverse luteous to sienna.

Other specimens examined.

CHINA, Hunan Province, on bamboo, 22 Sept. 2010, L. Cai, living culture LC2831; Jiangxi Province, on Phyllostachys sp., 05 Sept. 2013, Y.H. Gao, living culture LC4494; on Phyllostachys sp., 22 Apr. 2013, Q. Chen, living culture LC4993; ibid. living culture LC4497; ibid. living culture LC5001; ibid. living culture LC5004; on Imperata cylindrical , 22 Apr. 2013, Q. Chen, living culture LC5015; on Maesa sp., 05 Sept. 2013, Y.H. Gao, living culture LC4541; on Machilus sp., 05 Sept. 2013, Y.H. Gao, living culture LC4547; on Camellia sinensis , 05 Sept. 2013, Y.H. Gao, living culture LC4578; on bamboo, 01 Jul. 2016, J.E. Huang, living culture LC7104; ibid. living culture LC7154; ibid. living culture LC7156; ibid. living culture LC7275.

Notes.

Two strains representing Arthrinium jiangxiense clustered in a well-supported clade and appeared closely related to A. camelliae-sinensis (97% sequence similarity in ITS; 94% in TUB2; 94% in TEF1). While A. jiangxiensis is distinct from A. camelliae-sinensis in its smaller conidia (surface view 7.5-10.0 μm diam, side view 4.5-7.0 μm diam in A. jiangxiensis vs. globose or subglobose, 9.0-13.5 × 7.0-12.0 μm in A. camelliae-sinensis ) and conidiogenous cell arrangements (conidiogenous cells scattered on hyphae vs. aggregated irregularly on hyphae in A. jiangxiense ).