Antidactylaria minifimbriata 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

Antidactylaria minifimbriata Z.F. Yu, M. Qiao & R.F. Castaneda sp. nov.

Figs 2 , 9a

Etymology.

Latin, mini, meaning very small, minute, fimbriata, referring to edged, delicately toothed, fringe or frill that remained on the conidial base after rhexolytic secession.

Description.

Asexual morph hyphomycetous. Colonies on CMA white to rosy buff, reverse buff, attaining 2.7 cm diam. after 20 days at 25 °C. Mycelium partly superficial, partly immersed, composed of branched, slender, septate, hyaline, smooth-walled hyphae. Conidiophores semi-macronematous, mononematous, cylindrical, straight or slightly flexuous, unbranched, 0-1(-2)-septate, hyaline or pale brown, smooth, sometimes reduced to conidiogenous cells. Conidiogenous cells polyblastic, sympodial elongated, terminal, denticulate, denticles cylindrical, minute fringed. Conidia solitary, acrogenous, narrow obclavate, cylindrical to fusiform, attenuate, rostrate or caudate towards the apex, 27.7-40 × 2.5-3.3 µm, rostrum 10-19 × 1-1.8 µm, 2-septate, hyaline to subhyaline, smooth-walled, with a minute basal frill. Sexual state: unknown.

Type.

China, Hainan Province, Diaoluoshan National Forest Park, on submerged leaves, April 2014, Z.F Yu. Holotype YMF 1.04578, preserved in a metabolically-inactive state (deep freezing) in the Conservation and Utilization of Bio-Resources in Yunnan. Ex-type culture CGMCC 3.18825.

Notes.

Morphologically, Antidactylaria minifimbriata is similar to A. ampulliforma (= Isthmolongispora ampulliformis ) in conidial shape, but can be easily distinguished from it by having wider conidia (2.5-3.3 vs. 2.0-2.5 µm) and longer rostrum (10.0-19.0 vs. 6.0-10.0 µm) ( Yen et al. 2017).

Figures

Figure 2. Antidactylaria minifimbriata (Holotype YMF 1.04578) a-c conidia d conidiophore and conidiogenous cell e conidia on conidiophore under low objective. Scale bars: 10 µm (a-d); 50 µm (e).

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