An examination of brick walls and rocks in the botanic garden of Leiden University resulted in the discovery of a second locality in The Netherlands of Bryum donianum (on an old brick wall, mainly growing in crevices). Other floristically interesting observations included Brachythecium plumosum and Didymodon trifarius. In the rock garden a small patch was found of the former species which had been reported only twice before from the western part of the country. The latter species occurs on walls and rocks throughout the garden and may be less rare in The Netherlands than is suggested by the information available.