Pleosporales » Lentitheciaceae » Keissleriella

Keissleriella camporesii

Keissleriella camporesii C.G. Lin & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 67 (2020)

Index Fungorum number: IF557105; Facesofungi number: FoF 06182

Etymology: The specific is named in honour of the prolific fungus collector, Erio Camporesi.

Holotype: MFLU 15-1068

Saprobic on dried aerial spines of Rosa canina. Sexual morph: Undetermined. Asexual morph: Conidiomata up to 140 μm diam., immersed, pycnidial, scattered, brown to dark brown, globlose to subglobose, uni-loculate, indistinct ostiolate. Pycnidial walls thin-walled of brown to dark brown pseudoparenchymatous cells, of textura angularis. Conidiophores 9–25 × 2.4–3.4 μm, hyaline, unbranched or branched, smooth, flexuous, formed from the inner cells of the pycnidial wall. Conidiogenous cells monophialidic, cylindrical, hyaline. Conidia 5–10 × 1.5–5 μm, solitary, dry, acropleurogenous, simple, hyaline to pale brown, ellipsoidal, fusiform.

Culture characteristics: Conidia germinating on PDA within 24 h. Colonies on PDA effuse, greyish white from above, reaching 0.7–1.5 cm diam. in 7 days at 25 °C.

Material examined: ITALY, Province of Forli-Cesena Province, on dried aerial spines of Rosa canina L. (Rosaceae), 2014, Erio Camporesi, IT 2246 (MFLU 15-1068, holotype), ex-type living culture MFLUCC 15-0117.

GenBank Numbers: ITS: MN252879; LSU: MN252886; SSU: MN252907.

Note: The asexual morph of Keissleriella was reported as Dendrophoma Sacc. (Sivanesan 1984). Keissleriella camporesii shares morphological characters with Dendrophoma species, such as branched, hyaline conidiophores, phialidic conidiogenous cells and hyaline to brown, aseptate or septate conidia. In our phylogenetic analysis Keissleriella camporesii is grouped with K. cladophila (Niessl) Corbaz (CBS 104.55), K. rosacearum Phukhams., Camporesi & K.D. Hyde (MFLUCC 15-0089) and K. spartiicola (MFLUCC 14-0196) as a monophyletic clade. However, the asexual morph of K. rosacearum and K. spartiicola are undetermined (Liu et al. 2015; Wanasinghe et al. 2018), and thus morphology cannot be compared. The asexual morph of K. cladophila was described as pycnidia up to 150 μm broad, globose, ostiolate, branched, with 10–40 × 2–2.5 μm conidiogenous cells and hyaline, one-celled, oblong, 5–7 × 2–2.5 μm conidia (Sivanesan 1984). Keissleriella camporesii differs from K. cladophila by its hyaline to brown, 0–1-septate conidia.