Pleosporales » Didymellaceae » Neomicrosphaeropsis

Neomicrosphaeropsis cytisi

Neomicrosphaeropsis cytisi W.J. Li & K.D. Hyde, in Hyde et al., Fungal Diversity 80: 38 (2016)

Index Fungorum number: IF 552212; Facesofungi number: FoF 02347

Etymology: Named after the host genus Cytisus.

Holotype: MFLU 16-1871

Saprobic on dead stem of Cytisus sp. (Fabaceae), forming numerous, conspicuous, oval, dark brown, conidiomata. Sexual morph: Undetermined. Asexual morph: Coelomycetous. Conidiomata 75–155 μm diam. × 75–130 μm high, dark brown, solitary to gregarious or confluent, pycnidial, globose to subglobose, immersed, unilocular, thick-walled, smooth, ostiolate. Ostiole single, short, with acute apex, centrally located. Wall of conidiomata 10–24 μm wide, composed of thick-walled, brown to hyaline cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 2– 4 μm long × 3.5–6 μm wide, hyaline, enteroblastic, phialidic, doliiform to ampulliform, determinate, discrete, glabrous. Conidia 4.5–7 × 3–5 μm (x̄ = 5.7 × 3.9 μm, n = 30), initially hyaline, becoming pale brown to dark brown at maturity, globose to obovate, ellipsoidal to subcylindrical, rounded at both ends, unicellular, thick-walled, smooth.

Culture characteristics:  Colonies on PDA attaining 30–40 mm diam. after 4 weeks at 20–25 °C, with circular margin, dark jacinth to orange red to dark olivaceous, flattened, dense, aerial mycelium on the surface, reverse similar in colour.

Material examined: ITALY, Province of Arezzo [AR], Bagno di Cetica, on dead stem of Cytisus sp. (Fabaceae), 7 October 2012, Erio Camporesi, IT-784 (MFLU 16-1871, holotype); ex-type living culture, MFLUCC 13-0396, ICMP; ibid. IT-784B (HKAS 93585, isotype); living culture, KUMCC 16-0026.


Notes: Neomicrosphaeropsis cytisi differs from N. cytisinus in the form of the conidiomata. Neomicrosphaeropsis cytisi has immersed, ostiolate conidiomata that are smaller than those of N. cytisinus which are semi-immersed when immature, and become erumpent at maturity (190–220 μm high × 210–250 μm diam.) (Hyde et al. 2016).