Pleosporales » Didymellaceae » Neomicrosphaeropsis

Neomicrosphaeropsis cytisina

Neomicrosphaeropsis cytisina Tennakoon, Camporesi & K.D. Hyde [as 'cytisinus'], in Hyde et al., Fungal Diversity 80: 39 (2016)

Index Fungorum number: IF 629688; Facesofungi number: FoF 02396

Etymology: Name reflects the host genus Centaurea, from which the holotype was collected.

Holotype: MFLU 16-1364.

Saprobic on Cytisus sp. Sexual morph: Undetermined. Asexual morph: Coelomycetous. Conidiomata 190–220 μm high × 210–250 μm diam. (x̄ = 232 × 204 μm, n = 10), stromatic, solitary, immersed to semi-immersed when immature, becoming erumpent at maturity, globose to subglobose, uniloculate, black, dehiscing by an irregular split of the host epidermis. Peridium 20–25 μm wide, composed of 4–5 layers of light brown cells of textura angularis to textura prismatica. Conidiogenous cells 1–2 μm wide, phialidic, hyaline, thin-walled, smooth, integrated, producing a single conidium at the apex. Conidia 5–7 × 3–5 μm (x̄ = 67 × 4.2 μm, n = 30), initially hyaline, becoming light brown, moderately thick-walled, smooth, aseptate, ovoid, obtuse at apex, truncate or rounded at base.

Culture characteristics:  Colonies on PDA reaching 25–30 mm diam. after 8 days at 20–25 °C, medium sparse, circular, flat, slightly rough at surface with entire edge, with a well-defined margin, cottony to fairly fluffy with sparse mycelium; from above: white to cream at the margin, white to yellowish at the centre; from below, light yellow to light brown at the margin, yellowish at the centre; mycelium white to cream with tufting; not producing pigments in PDA medium.

Material examined: ITALY, Province of Arezzo [AR], near Croce di Pratomagno, on dead stem of branch of Cytisus scoparius L. (Fabaceae), 24 June 2012, E. Camporesi, IT 472 (MFLU 16-1364, holotype; HKAS 93703, isotype), ex-type living cultures, MFLUCC 16-0790, KUMCC 15-0557.

GenBank:

Notes: Neomicrosphaeropsis cytisinus resembles N. cytisi in sharing the size range of conidiophores and conidiogenous cells, but differs in the size of conidiomata (75–130 × 74–157 μm) and thickness of peridium (10–24 μm). Neomicrosphaeropsis cytisinus differs from Neomicrosphaeropsis minima in the size of conidiomata (3–5.5 × 2–4 μm), conidiophores and host. Phylogenetic analyses show that they are distinct with high bootstrap support (98 %ML, 1.00 BYPP) (Hyde et al. 2016).

 

Figure x Neomicrosphaeropsis cytisina (holotype) (N. cytisinus from Hyde et al. 2016). a Appearance of conidiomata on host. b Close-up of conidiomata. c Section of conidioma. d Section of peridium. e Conidiogenous cells. f–i Conidia. j. Germinated conidia. l Colony from above. m Colony from below. Scale bars c = 50 μm, d = 20 μm, e = 5 μm, f–i = 2 μm, j = 10 μm.

 

References:

 

Hyde KD, HongsananS, Jeewon R, Bhat DJ et al. 2016 –  Fungal diversity notes 367–490: taxonomic and phylogenetic contributions to fungal taxa. Fungal diversity 80, 1–270.

 

Last Update: 22 April 2021

 

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