Excerpt from A Laboratory Manual in Practical Botany The Pteridophytes. Here, in contrast with the Thallo phytes and Bryophytes, the ordinary form of the plant is the sporophyte. The alternation of generations is sharp. The spore develops into a at aggregate of cells called the prothallium, which resembles in function the protonema of the Bryophytes. The prothallium is the gametophyte. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."