Flavignomonia rhoigena C.M. Tian & Q. Yang

Jiang, Ning, Yang, Qin, Liang, Ying-Mei & Tian, Cheng-Ming, 2019, Taxonomy of two synnematal fungal species from Rhus chinensis, with Flavignomonia gen. nov. described, MycoKeys 60, pp. 17-29 : 17

Flavignomonia rhoigena C.M. Tian & Q. Yang sp. nov. Figure 2

Diagnosis.

Flavignomonia rhoigena can be distinguished from other gnomoniaceous species by the formation of synnemata.

Etymology.

Named after the host genus, Rhus .

Description.

Sexual morph: not observed. Asexual morph: Conidiomata synnematal. Synnemata (650 –)750– 1100 µm high, 150-300 µm diam, determinate, growing from host tissue, with brown base and orange tip, straight to curved, parallel, with flat to slightly concave and dark zone of conidiogenous cells and host tissue at their bases. Conidiophores reduced to conidiogenous cells. Conidiogenous cells (12.5 –)16–22(– 25) × 2 μm, phialidic, aggregated, hyaline, straight to curved, cylindrical, arranged adjacent to one another at the end of the synnema, producing a single conidium. Conidia cylindrical to oblong, smooth, multiguttulate, hyaline, (5 –)5.5–7(– 8) × 1.5-2 µm.

Culture characters.

On PDA at 25 °C in darkness, initially white, becoming olive-green to black after 3 wk, zonate with 3-4 well defined zones. Conidiomata distributed concentrically over agar surface.

Specimen examined.

CHINA, Jiangxi Province, Ganzhou City, Xunwu County, 24°52'31.34"N, 115°35'39.53"E, on branches of Rhus chinensis , 14 May 2018, Q. Yang, Y. Liu & Y.M. Liang (holotype BJFC-S1766, ex-type living cultures CFCC 53118, CFCC 53119 and CFCC 53120).

Notes.

Flavignomonia rhoigena is the type species of Flavignomonia in the family Gnomoniaceae . It can be easily distinguished from the other gnomoniaceous genera by its unique conidiomata (Walker et al. 2004, Senanayake et al. 2018, Crous et al. 2019, Minoshima et al. 2019).

Figures

Figure 2. Flavignomonia rhoigena on Rhus chinensis (BJFC-S 1766, holotype) A-C habit of conidiomata on twigs D transverse section through synnema E longitudinal section through synnema F, I conidiogenous cells attached with conidia G conidiomata on PDA H condia J the colony on PDA. Scale bars: 1 mm (B); 500 μm (C); 100 μm (D); 10 μm (F, H-I); 200 μm (G).