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The new genus and species Deltopyxis triangulispora is described. It is so far known from 14 sites in the south of Luxembourg and one in the neighbouring region of France. The discomycete forms very small, blackish-brown apothecia on bark, more rarely on wood, but particularly on more or less strongly senescent hymenia of Vuilleminia spp. The apothecia occur on dead, corticated, internally very slightly to rather strongly white-rotten, attached or broken, periodically dry branches at a height of about 1–3 m above ground. In most of the collections Vuilleminia was present and covered the
bast on one side of the branch, while the periderm still covered the remaining areas. D. triangulispora is so far recorded on angiosperm shrubs of the genera Corylus, Crataegus, Ilex, Prunus, and Salix, which had an advanced age or were already dead. The species prefers undisturbed, usually thermophilous hedges or open woodlands, especially close to their edges, but sometimes occurs also in dense, more air-humid woods. The fungus is characterized by 64-spored, elongate saccate, short-stalked, inamyloid, rather thin-walled asci which arise from croziers and open at the apex by a broad slit-like pore. The hyaline ascospores have a distinctly triangular shape when seen in profile view, but look slightly flattened, (ellipsoid-)deltoid in front view. In the living ascus they are arranged in a dense elongate cluster, which is forcibly discharged as one entity.
The position of Deltopyxis within the Ascomycota is unknown.