Pteridophytes of Costa Rica : preliminary checklist of species known to be or probably occurring in Costa Rica /

by Wagner, Warren Herbert 1920-2000
Published 1966

The fern genus Diellia : its structure, affinities and taxonomy /

by Wagner, Warren Herbert 1920-2000
Published 1952

Biology of tropical pteridophytes /

Published 1967

Michigan trees : a guide to the trees of Michigan and the Great Lakes region /

by Barnes, Burton V.
Published 1981