In the present study a comparison of the holotypes of Coprinus calyptratus, C. vosoustii, C. asterophorus and C. asterophoroides has been carried out. As a conclusion of the latter we can state that all of them are conspecific, the correct name of this taxon being C. calyptratus. On the other hand the study of the type of Coprinus xerophilus, a vernal species which occurs in xerothermic plant communities on calcareous and gypsiferous soils, shows that this taxon is very close to C. calyptratus. Finally, we have studied the type of C. arenarius, a species which shares the same habitat as both C. calyptratus and C. xerophilus, and conclude that the former is different, being a species in its own right, known only from Africa. Coprinus xerophilus is a new record for the European mycobiota.