The Systematics and Ecology of the Pteridophytes of Northern Spain
Catalogue of the Plants of Gillespie Co., Texas in the Jermy Herbarium
A World of Ferns
Checklist of European Pteridophytes
Tropical Forest Expeditions
Biodiversity Assessment
The Genus Callithamnion (Rhodophyta, Ceramiaceae) in the British Isles
The Illustrated Field Guide to Ferns and Allied Plants of the British Isles
British Museum (Natural History) and University of Newcastle-upon-Tyne Expedition to New Guinea, September 3, 1964 to March 18, 1965
A crib for ferns and allied plants
Gunung Mulu National Park, Sarawak
The Genus Selaginella in Tropical South America
Pteridophyta
Six New Species of Selaginella from Tropical South America
In Vitro Studies Into the Role of Natural Killer Cells in Virus Infections
Cytotaxonomic Studies of the Ferns of Trinidad
The BM Fern Crib
Sedges of the British Isles
Studies in the Genus Hypericum L. (Guttiferae)