American Fossil Cycads Volume 2

by

Write The First Customer Review

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 Excerpt: ...At first sight there seems to be a wide gap between the platyspermic and radiospermic seeds; but from several points of view there is no greater hiatus between the two-angled or platyspermic and the trigonal forms than between the latter and the more highly angled forms. In the first place, the transition between these ...