Arthrinium guizhouense 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 : 3-5

Arthrinium guizhouense M. Wang & L. Cai sp. nov. Figure 6

Type.

CHINA, Guizhou Province, from the air in karst cave, 23 Jul. 2014, Z.F. Zhang, (holotype: HMAS 247188; culture ex-type: CGMCC 3.18334 = LC5322).

Etymology.

Named after the province where type was collected, Guizhou province.

Description.

Hyphae hyaline, branched, septate, 1.5-5.0 μm diam. Conidiophores reduced to conidiogenous cells. Conidiogenous cells erect, aggregated in clusters on hy phae, pale brown, smooth, subglobose, ampulliform or doliiform, 3.5-8.0 × 3.0 - 4.5 μm (x̄ =5.1 ± 1.08 × 3.7 ± 0.49, n = 30). Conidia dark brown to black, smooth to finely roughened, globose or subglobose, occasionally elongated to ellipsoidal, with a longitudinal, hyaline, thin, germ slit, 5.0-7.5 × 4.0-7.0 μm (x̄ = 6.1 ± 0.5 × 5.5 ± 0.6, n = 50).

Culture characteristics.

On PDA, colonies flat, woolly, margin circular, with moderate aerial mycelia, surface initially white, becoming greyish and reverse with black patches, reaching 9 cm in 9 days at 25 °C. On MEA, surface dirty white with patches of olivaceous-grey and reverse greyish.

Other specimens examined.

CHINA, Guizhou Province, from the air in karst cave, 23 Jul. 2014, Z.F. Zhang, living culture LC5318.

Notes.

Arthrinium guizhouense is closely related to A. sacchari (Speg.) M.B. Ellis (99% sequence similarity in ITS; 99% in TUB2; 94% in TEF1). Morphologically, A. guizhouense and A. sacchari are very similar in conidial size, but A. guizhouensis produces relatively shorter conidiogenous cells (3.5-8.0 μm in A. guizhouense vs. 5-12 μm in A. sacchari ).