Editorial note: Traditionally we have included literature references on nonvascular plants. We have, however, the impression that few, if any, are interested in this information, as we hardly ever get any reaction from scientists engaged in these fields. Cryptogamists, moreover, often give no inkling as to the distribution of their taxa, which makes the scanning of their literature a timeconsuming and unrewarding business. Therefore, unless serious protests are received, and unless specialists offer their assistance in compiling the relevant literature, we intend to save ourselves space and a lot of time, and propose to delete the sub-chapters a) and b) starting with the next volume.