TY - JOUR A1 - Gradstein, Stephan Robbert A1 - Florschütz-de Waard, J. T1 - Results of a botanical expedition to mount Roraima, Guyana. I. Bryophytes T2 - Tropical bryology N2 - A bryological inventory of the Upper Mazaruni District, Guyana (former British Guiana) yielded almost three hundred species, including 2 genera and 11 species new to science and 130 species new to the Guianas. The densely forested and very humid north slope of Mount Roraima (500-2300 m.) proved to be the richest area for bryophytes and most of the novelties were found there. The present paper provides an enumeration of the species collected with a brief characterization of their habitat. The following species are described as new: Haesselia acuminata Gradst., Plagiochila gymnocalyx Inoue, Radula gradsteinii Yamada, Radula guyanensis Yamada, Radula mazarunensis Yamada and Stenorrhipis grollei Gradst. Anastrophyllum subg. Vanaea Inoue & Gradst. from Mount Roraima is elevated to generic rank. Y1 - 1989 UR - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/30620 UR - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-306209 N1 - The layout of the electronic version of this contribution differs from the layout of the original version published in the printed volume. VL - 1 SP - 25 EP - 54 ER -