Publisher's Synopsis
Excerpt from A Monograph of the Genus Dryopteris, Vol. 1: The Tropical American Pinnatifid-Bipinnatifid Species
In earlier papers I have published a review of the species belonging to the two subgenera Lastrea and Since the publication of these papers I have received for determination or examination a large number' of specimens of species belonging to the two subgenera mentioned; several of these species were previously unknown to me, and some others were found to be undescribed. I have now, therefore, not a few additions to my earlier papers, and as my former keys consequently now are uncomplete, I give in the present work new keys to all known species of the two subgenera. In this work 280 species are dealt with; about 100 of these were treated in detail in my earlier papers.
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