Par Perić B., Baral H.O.
Vol. 12 (6) – 29 décembre 2020
Résumé (anglais) : Two new species of the genus Cenangiopsis with non-lanceolate paraphyses and inamyloid asci are described: C. desae and C. rosae. Both develop on periodically dry twigs and branches of Rosa spp. in mountainous areas of Montenegro. The two species are easily distinguished from each other by the colour of the apothecial disc and exterior: C. rosae has a brownish disc and exterior with a whitish margin similar to all other species of this genus, whereas C. desae sharply differs in an orange-red disc and blackish exterior. The cylindric-ellipsoid ascospores of the two species resemble in size, shape, colour, and oil content those of the other two species with non-lanceolate paraphyses, C. alpestris and C. andreae, except that the ascospores of C. desae have a low lipid content and when overmature they do not become brown but instead septate. All species with lanceolate paraphyses (C. junipericola, C. livida, C. raghavanii, C. quercicola, C. violascens) have smaller, often heteropolar (cuneate) ascospores with a low lipid content which remain hyaline and non-septate with age. Within the group with non-lanceolate paraphyses, C. rosae is similar to C. alpestris and C. andreae, but C. andreae is extraordinary by its amyloid asci, which also occur in all species with lanceolate paraphyses, and C. alpestris differs from C. rosae mainly by ejecting hyaline instead of brown ascospores. C. alpestris and C. rosae resemble Velutarina rufoolivacea in shape and colour of the apothecia, but have much narrower cylindric-ellipsoid ascospores and lack both an amyloid ascus apical ring and vesicular elements in the excipulum.
Based mainly on molecular data, the family Cenangiaceae Rehm was resurrected by Pärtel et al. (2017) for taxa previously included in subfamily Encoelioideae Nannf. of Helotiaceae Rehm on the one hand, and for members of the younger Hemiphacidiaceae Korf on the other hand. In a series of recent papers, the closely related genera Cenangiopsis and Velutarina […]