Rubroshiraia bambusae D.Q. Dai & K.D. Hyde

Dai, Dong-Qin, Wijayawardene, Nalin N., Tang, Li-Zhou, Liu, Chao, Han, Li-Hong, Chu, Hong-Long, Wang, Hai-Bo, Liao, Chun-Fang, Yang, Er-Fu, Xu, Rui-Fang, Li, Yun-Min, Hyde, Kevin D., Bhat, D. Jayarama & Cannon, Paul F., 2019, Rubroshiraia gen. nov., a second hypocrellin-producing genus in Shiraiaceae (Pleosporales), MycoKeys 58, pp. 1-26 : 1

Rubroshiraia bambusae D.Q. Dai & K.D. Hyde sp. nov. Fig. 7

Etymology.

Refers the bamboo host.

Holotype.

HKAS102255.

Description.

Parasitic on living branches of bamboo. Sexual morph: Ascostromata 0.7-1.5 cm long × 0.7-1.3 cm wide, solitary, superficial, globose to subglobose, fleshy, reddish, with locules lining the periphery, with dark ostiolate points appearing on the surface. Ascostromatic tissue thick, pinkish, composed of wider woven hyphae of textura intricata. Locules in vertical section 800-1800 µm high × 1000-2000 µm diam. (x̄ = 1289.4 × 1368.8 µm, n = 20), globose to subglobose, immersed in the periphery layer of ascostromata, with 250-500 µm wide × 450-550 µm high ostioles. Peridium 20-35 µm thick, composed of several layers of hyaline to dark brown, small cells of textura angularis to textura intricata. Hamathecium of interthecial, hyaline septate, branched pseudoparaphyses, 1-3 µm wide. Asci 660-800 × 45-55 µm (x̄ = 751.6 × 49.5 µm, n = 20), 8-spored, thick-walled, bitunicate, fissitunicate, cylindrical, short-pedicellate, with an ocular chamber. Ascospores 600-750 × 5.5-11 µm (x̄ = 728.8 × 9.1 µm, n = 20), spirally arranged in asci, filiform, hyaline, with 15-18 transverse septa, smooth-walled. Asexual morph: Undetermined.

Material examined.

CHINA, Yunnan, Dali, on living branches of Fargesia spathacea Franch, 13 May 2017, Dong-Qin Dai, DDQ00411 (HKAS102255, holotype), Ibid. (HMAS 290447, isotype), Ibid. DDQ00412 (HKAS102256), Ibid. DDQ00416 (HKAS102260), Ibid. 20 June 2017, Dong-Qin Dai, DDQ00425 (HKAS102268), Ibid. DDQ00426 (HKAS102269), Ibid. DDQ00427 (HKAS102270), Ibid. DDQ00428 (HKAS102271), Ibid. DDQ00429 (HKAS102272), Ibid. DDQ00430 (HKAS102273), Ibid. DDQ00431 (HKAS102274).

Figures

Figure 7. Rubroshiraia bambusae (HKAS 102255, holotype) A fruiting bodies B, C surface of ascostromata showing the openings of ostiole D vertical section of ascostromata E, F vertical section of locule G peridium of locule H asci and pseudoparaphyses I asci and asci ocular chamber J ascospores K, L immature asci. Scale bars: 1 cm (A), 25 mm (B), 2 mm (C, D), 500 μm (E, F), 200 μm (G), 50 μm (H-L).