their morphology, cytology, taxonomy and phylogeny Bir, S. S. text New Delhi Today and Tomorrow's Printers and Publishers c1983 monographic viii,253 p. : ill. (with 4 leaflets) S. S. Bir Includes bibliographical references and index Pteridophytes Botany QK521 .P8 1983 vol.6 UOEL 000 20250408114621.0