Reference Entry


Michael Allaby

in A Dictionary of Geology and Earth Sciences

Fourth edition

Published in print January 2013 | ISBN: 9780199653065
Published online September 2013 | e-ISBN: 9780191744334

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Primitive *pteridophytes, which were the earliest vascular plants, from the *Silurian and the *Devonian. They had slender, tapering, leafless or scale-bearing stems up to 50cm high, often with cone-shaped sporangia (...

Reference Entry.  122 words. 

Subjects: Earth Sciences and Geography

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