Wawelia effusa Lundq., spec. nov. is described, a stromatic pyrenomycete with 8-spored, deliquescing, non-amyloid asci without apical apparatus and with limoniform spores with a germ slit. It is found on dung of hare and roe-deer in Sweden and Hungary respectively, and differs from the two other species of the genus, W. regia Namysłowski and W. octospora Minter & Webster, by a basal, effused stroma, equilateral spores and probable lack of an anamorph. The stromatic nature of W. effusa is discussed, as well as the taxonomic position of the genus and the ecology of its species. The author joins those who argue for Wawelia being xylariaceous.