Ulota rehmannii Jur. (Musci) in the Ardenne massif; new for the Belgian bry
oflora. - Ulota rehmannii Jur. has been discovered for the first time in Be
lgium in the Ardenne massif. A description and illustration of the Belgian
material is provided. Features of its ecology and peculiarities of its dist
ribution are given. This European endemic is very rare everywhere.