Excerpt from Handbook of the Fern-Allies: A Synopsis of the Genera and Species of the Natural Orders Equisetaceæ, Lycopodiaceæ, Selaginellaceæ, Rhizocarpeæ
I have not attempted to deal in any way with the fossil types of the orders here included, a study of which, however, is... quite needful to understand their relations to one another and other plants. These have recently been fully dealt with by Professor Williamson, in a series of papers in the 'philosophical Transactions of the Royal Society,' beginning with the year 1871 and the student will find an excellent brief general summary of what is known about them in the translation, just issued from the Clarendon Press at Oxford, of Goebel's amplication of the systematic portion of Sach's Textbook.'
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