Pleosporales » Phaeosphaeriaceae » Sclerostagonospora

Sclerostagonospora rosicola

Sclerostagonospora rosicola W.J. Li, Camporesi & K.D. Hyde, in Wanasinghe et al., Fungal Diversity: 10.1007/s13225-018-0395-7, [143] (2018)

Index Fungorum number: IF 554197; Facesofungi number: FoF 04039

Etymology: The specific epithet reflects the host genus Rosa.

Holotype: MFLU 17-2783.

Saprobic on Rosaceae. Sexual morph: Undetermined. Asexual morph: coelomycetous. Conidiomata 150–200 μm high, 100–150 μm diam., pycnidial, effuse, solitary, gregarious or confluence, semi-immersed to superficial, unilocular, globose, glabrous, dark brown, ostiolate. Ostiole centrally located, papillate, circular. Peridium 15–30 μm wide, composed of thick-walled cells of textura angularis, brown. Conidiophores reduced to conidiogenous cells. Conidiogenous cells phialidic, integrated, flaskshaped, hyaline, smooth-walled. Conidia 15–20 × 3–5 μm (x̄ = 18 × 5 μm; n = 20), fusiform to cylindrical, guttulate, continuous, straight or slightly curved, 3-septate, slightly constricted at septa, obtuse at apex and base, sometimes slightly truncate at base, pale brown, smooth-walled.

Material examined: ITALY, Arezzo Province [AR], Montemezzano, on dead aerial spines of Rosa sp. (Rosaceae), 25 August 2014, Erio Camporesi, IT 2174 (MFLU 17-2783); ex-type living culture, MFLUCC 15-0129.

GenBank Numbers: ITS: MG828957, LSU: MG829068, SSU: MG829172, TEF: MG829237.

Notes: During our collecting, Sclerostagonospora rosicola was found on dead spines of Rosa sp. Morphological characters of S. rosicola fit with other Sclerostagonospora species in having pycnidial conidiomata, hyaline conidiogenous cells and sub-cylindrical, pigmented conidia (Crous et al. 2011, Quaedvlieg et al. 2013). According to the multi-gene phylogenetic analysis Sclerostagonospora rosicola shares a close relationship with S. rosacearum with low bootstrap support. However, it differs in having large conidiomata (150–200 × 100–150 μm) and 3-septate, longer conidia (15–20 × 3–5 μm); whereas S. rosacearum has smaller conidiomata (60–100 × 80–120 lm) and mostly 1-septate, shorter conidia (8–12 × 4–5 μm).