Nicholson, Barbara Evelyn The Oxford book of flowerless plants ferns, fungi, mosses and liverworts, lichens, and seaweeds Barbara E. Nicholson illustrated by B.E. Nicholson text by Frank H. Brightman - London Oxford University Press 1966 - 208p. col. ill. 25cm Bibliography: p.201 ISBN: 0199100047 LCCN: 66-76521 Subjects--Topical Terms: CryptogamsBotany--United Kingdom