Rhytidiella Zalasky, Can. J. Bot. 46(11): 1383 (1968).
Index Fungorum number: IF 4741; Facesoffungi number: FoF 08188, 4 morphological species (Species Fungorum 2022), no molecular data available.
Saprobic on host. Sexual morph: Perithecia erumpent, superficial, hemispherical, very black, usually with a truncate base; apex sulcate, pored. Asci cylindric to clavate, bitunicate, paraphysate. Ascospores scolecosporous, hyaline to yellow-brown, septate. Asexual morph: Small slow-growing dense white colonies in culture, black-colored mycelium in the medium, with few or no grey aerial hyphae; later a characteristic opaque dark brown color forms in the agar medium. Pycnidial masses formed over the entire colony on a dark brown sponge-like stroma erumpent from the agar medium. Pycnidia black, cushion- to club shaped, ovoid to columnar, often forked and opening by a simple round pore. Mature conidia pale brown, tapered towards rounded ends or wider below and tapered gradually upwards (adapted from Zalasky 1968).
Type species: Rhytidiella moriformis Zalasky
Notes: Rhytidiella is characterised by erumpent, superficial, hemispherical perithecia, cylindric to clavate asci and scolecosporous, hyaline to yellow-brown, septate ascospores. Rhytidiella produces both sexual and asexual states in nature and Phaeoseptoria conidia and microconidia in culture. Barr (1987) tentatively accommodated Rhytidiella to Cucurbitariaceae based on morphology. Doilom et al. (2013) accepted Rhytidiella as a member in Cucurbitariaceae. Rhytidiella is a distinct genus in Cucurbitariaceae but molecular data is lacking for the genus.
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