Pleosporales » Didymellaceae » Neoascochyta

Neoascochyta dactylidis

Neoascochyta dactylidis W.J. Li, Camporesi & K.D. Hyde, sp. nov.

Index Fungorum number: IF557150, Facesoffungi number: FoF 07463

Etymology: Name refers to Dactylis, the host genus from which this fungus was collected.

 

Saprobic on dead stems of Dactylis glomerata. Sexual morph: undetermined. Asexual morph: Conidiomata 100–125 µm high, 100–130 µm diam., dark brown to black, pycnidial, solitary, gregarious or confluent, deeply immersed with black spots on the host surface, globose, unilocular, glabrous, ostiolate. Conidiomatal wall 10–20 µm wide, composed of brown to dark brown, thick-walled cells of textura globosa in the exterior, becoming thin-walled, pale brown to hyaline cells of textura angularis in the conidial hymenium. Ostiole single, circular, papillate, centrally located. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 4–9 × 3.5–10 µm, hyaline, enteroblactic, phialidic, short, originating from the innermost cell layer of conidiomata. Conidia 20–29 × 5–8 µm (= 25 × 7 µm; n = 50), hyaline, cylindrical to fusiform, with narrow and rounded ends or sometime broad and truncate at base, 1-septate, straight or slightly curved, thick- and smooth-walled, with two large guttules in each cell.

 

Culture characters: Colonies on PDA, reaching 12–15 mm diam. after 7d at 25–30°C, white to pale brown in the middle zone, paler toward margins, with orange mycelium mass in the middle zone after 4 weeks, umbonate, dense, reverse brown, with white margins.

 

Material examined: Italy, Province of Forlì-Cesena, Predappio, near Monte Colombo, on dead aerial stems of Dactylis glomerata (Poaceae), 2 February 2013, Erio Camporesi, IT1038 (MFLU 19-2859, holotype), ex-type living culture MFLUCC 13-0495, (KUN, HKAS 101674, isotype).

 

Notes: Neoascochyta dactylidis shows a closely affinity with N. europaea, N. exitialis and N. graminicola, but constitutes a separate branch (Fig. 236). Morphologically, it fits well with the concept of Neoascochyta, but can be distinguished by its larger conidia with four large guttules. Based on both phylogeny and morphology, N. dactylidis is described as new taxon in Neoascochyta.

Neoascochyta dactylidis (MFLU 19-2859, holotype) a Herbarium specimen. b, c Appearance of black conidiomata on the host. d Vertical section of conidioma. e Vertical sections of peridium. f Ostiole. g–j Conidiogenous cells and developing conidia. k Germinating conidium. l–o Conidia. Scale bars: b = 500 µm, c = 100 µm, d = 50 µm, e = 20 µm, f = 50 µm, g = 5 µm, h–o = 10 µm.

 

Neoascochyta dactylidis (MFLUCC 13-0495, ex-type) a Germinating conidia. b–e Culture on PDA (b, c one week, d, e four weeks). Scale bars: a = 50 µm, b–e = 20 µm.

 

 

 

References:

 

Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.

 

 

 

 

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