Pleosporales » Didymellaceae » Neoascochyta

Neoascochyta rosicola

Neoascochyta rosicola Phukhams., Camporesi & K.D. Hyde, in Wanasinghe et al., Fungal Diversity: 10.1007/s13225-018-0395-7, [29] (2018)

Index Fungorum number: IF554130; Facesofungi number: FoF 03967

Etymology: The specific epithet reflects the host genus Rosa.

Holotype: MFLU 15-1046

Saprobic on dried spine of Rosa canina. Sexual morph: Undetermined. Asexual morph: Conidiomata 56–116 × 142–233 μm diam. (x̄ =  89 × 180 μm, n = 5), an acervulus, semi-immersed to erumpent, separate, scattered, dark brown to black, saucer-shaped, flat at base, unilocular. Pycnidial wall 17–44 μm, thin-walled merging with host tissues, composed of textura angularis and textura globulosa with light brown cells bearing conidiogenous cells. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 6–11 × 3–4 μm (x̄ = 8 × 4 μm, n = 20), holoblastic, annelidic, determinate, discrete, solitary, oblong, formed from inner cells of acervulus wall, brown at base, hyaline at the apex. Conidia 9–16 × 3–5 μm (x̄ = 13 × 4 μm, n = 50), hyaline, brown at maturity, broad-fusiform, slightly conical towards both ends, constricted at the septa, with 1 longitudinal septum, smooth-walled.

Culture character: Colonies on PDA 20 mm diam. after 4 weeks at 16 °C, cream to greyish; reverse black at the center, radiating grey towards the edge, medium dense, circular, umbonate, fimbriate, fairly fluffy, not producing pigments.

Material examined: Italy, Forlı`-Cesena [FC], Tontola di Predappio, on dried spines of Rosa canina (Rosaceae), 4 April 2014, Erio Camporesi, IT 2242 (MFLU 15-1046, holotype), ex-type living culture, MFLUCC 15-0048.

GenBank Numbers: ITS: MG828921; LSU: MG829031; RPB2: MG829258 .

Note: Neoascochyta rosicola has a close phylogenetic affinity to N. argentina and N. triticicola in our phylogeny analyses. Morphologically, it differs from them in producing one septate conidia, while N. argentina and N. triticicola have aseptate conidia.

 

Figure x. Neoascochyta rosicola (MFLU 15-1046, holotype). a On spines of Rosa canina. b Close up of conidiomata. c Vertical section through the conidioma wall. d Partial conidioma wall. e–g Developing stages of conidiogenous cells. i–k Conidia. Scale bar: b = 500 µm, c = 200 µm, d = 20 µm, e–k = 5 µm

 

References:

Wanasinghe DN, Phukhamsakda C, Hyde KD, Jeewon R et al. 2018 – Fungal diversity notes 709–839: taxonomic and phylogenetic contributions to fungal taxa with an emphasis on fungi on Rosaceae. Fungal diversity 89, 1–236.

 

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