Ferns and Allied Plants: With Special Reference to Tropical America - Paperbackby R. M. Tryon (Author), W. H. Hodge (Illustrator), A. F. Tryon (Author) This systematic treatment of the ferns and allied plants provides a modern classification of the Pteridophyta based on an assess ment of the wealth of new data published during the last few decades as well as on our own research. The accounts of the gen era include systematics, ecology, geography, spores and cytology and often other aspects of their biology. The scope of the work