Triscelophorus anisopteriodeus Z. F. Yu, M. Qiao & R. F. Castaneda, 2021

Qiao, Min, Zheng, Hua, Guo, Ji-Shu, Castaneda-Ruiz, Rafael F., Xu, Jian-Ping, Peng, Jie, Zhang, Ke-Qin & Yu, Ze-Fen, 2021, Two new asexual genera and six new asexual species in the family Microthyriaceae (Dothideomycetes, Ascomycota) from China, MycoKeys 85, pp. 1-30 : 1

Triscelophorus anisopteriodeus Z. F. Yu, M. Qiao & R. F. Castaneda sp. nov.

Figs 7 , 9f

Etymology.

Latin, anisopteriodeus, referring to the resemblance of the conidial body to an adult of Anisoptera sp.

Description.

Asexual morph hyphomycetous. Colonies on CMA, attaining about 1 cm diam. after 20 days at 25 °C, light smoky grey. Reverse smoky grey. Mycelium superficial and immersed, composed of branched, septate, hyaline hyphae. Conidiophores macronematous, mononematous, cylindrical, erect, flexuous, unbranched, smooth, hyaline, up to 20-110 µm long. Conidiogenous cells monoblastic, cylindrical, terminal, integrated, determinate, smooth, hyaline. Conidia solitary, acrogenous, staurospore, septate, composed of a main axis and 2-4 lateral branches: i) the main axis elongate obclavate, 2-4-septate, straight, smooth, hyaline, 31.2-48 × 3-5.2 µm; ii) 2-4-lateral branches obclavate to broad obclavate, straight, smooth, hyaline, all arising divergent, unequal, from the basal cell of the main axis: ii a) upper two lateral branches, 2-3-septate, 8.2-38.7 × 2.5-4.8 µm, more or less opposite, arranged just below the supra-basal septum; ii b) lower lateral branches, 0-1-septate, 14-20 × 5-5.5 µm, sequential opposite arranged near the middle of the basal cell. Sexual state: unknown.

Type.

China, Hainan Province, Limu Mountain Nature Reserve, on submerged leaves, April 2015, J. Peng. Holotype YMF 1.04267, preserved in a metabolically-inactive state (deep freezing) in the Conservation and Utilization of Bio-Resources in Yunnan. Ex-type culture CGMCC 3.18978.

Notes.

Triscelophorus anisopteriodeus is differentiated from other known Triscelo2 like a dragonfly-shape ( Seifert et al. 2011). Four lateral branches are not arising from the same level at the basal cell of main axis. Two shorter ones are lower and two longer ones are upper. Amongst conidia of Triscelophorus spp., three lateral branches are often growing in a whorl, while 2 lateral branches are in pairs. Four lateral branches in pairs in T. anisopteriodeus make it easily recognisable. Morphologically, T. anisopteriodeus is similar to Triramulispora duobinibrachiata K. Ando in conidial shape, but T. anisopteriodeus has larger size of conidia (main axis: 31.2-48 × 3-5.2 vs. 19-36 × 2.5-3.5 µm) and more septa in branches ( Ando 1993).

Figures

Figure 7. Triscelophorus anisopteriodeus (Holotype YMF 1.04267) a, c conidia b conidiophores with conidia. Scale bars: 10 µm (a-c).

Figure 9. Cultural characters of all species in this study after 20 days on PDA at 25 ° C.