Pleosporales » Phaeosphaeriaceae » Neosetophoma

Neosetophoma rosarum

Neosetophoma rosarum R.H. Perera, Wanas., Camporesi & K.D. Hyde, in Wanasinghe et al., Fungal Diversity: 10.1007/s13225-018-0395-7, [126] (2018)

Index Fungorum number: IF 553965; Facesofungi number: FoF 04027

Etymology: The specific epithet reflects the host genus Rosa.

Holotype: MFLU 17-0308.

Saprobic on Rosa canina. Sexual morph: Undetermined. Asexual morph: Conidiomata 66–120 μm diam., 55–100 μm high, pycnidial, immersed, globose to subglobose, black, gregarious, unilocular, but occasionally multilocular, ostiolate. Peridium 6–10 μm wide, comprising thick-walled, brown to dark brown cells of textura angularis, inner layer comprising hyaline cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 4.6–6 × 3–3.4 μm, lining the inner cavity of the conidiomata, doliiform to ampulliform, simple, integrated, enteroblastic, phialidic, hyaline, smoothwalled. Conidia 5.6–8.2 × 1.6–2.3 μm (x̄ = 7.1 × 1.8 μm, n = 25), pale brown, straight to curved, subcylindrical, apex obtusely rounded, with a bluntly rounded to truncate base, 1(2,3)-euseptate, smooth-walled, thick-walled, guttulate.

Culture characters: Colonies on PDA reaching up to 30 mm diam. after 14d at 25 °C, circular, flat, margins smooth, with a moderate amount of aerial mycelium, white from above and greyish white from reverse.

Material examined: Italy, Forlı`-Cesena Province, Collina, on dead aerial spines of Rosa canina L. (Rosaceae), 11 November 2014, Erio Camporesi, IT 2225 (MFLU 17-0308, holotype).

GenBank Numbers: ITS: MG828927, LSU: MG829036, SSU: MG829142.

Notes: Our new isolate MFLU 17-0308 clustered within Neosetophoma in a separate clade with 99% ML, 65% MP, 1.00 PP bootstrap support. Neosetophoma rosarum shows some morphological similarities to N. italica which was isolated from Iris germanica L. (Liu et al. 2015). However, N. rosarum can be distinguished from N. italica by larger conidiomata (vs. 50–60 × 40–75 μm) and smaller conidia (vs. 6–11 × 3–4 μm) (Liu et al. 2015). DNA was obtained from isolates which however did not survive the preservation process.