Bryocentria hypothallina (Bionectriaceae, Hypocreales) is described as a new species. It grows necrotrophically
on the liverwort Metzgeria furcata (Metzgeriales), causing bleached, insular infections. Ascomata
are formed on the ventral side of the thalli and perforate them from below. The novel ascomycete
species is recorded from France, Norway, and Spain. Thus, the obligately bryophilous genus Bryocentria now
includes eight species. Our new species is characterized ecologically by its specialized microhabitat, and
morphologically by having ascospores bearing tiny cyanophilous warts.
Bryophily, hepaticolous ascomycetes, liverworts as hosts, necrotrophic parasites, thallus perforation