. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. MARATTIACEAE 507 the long petiole bears five palmately disposed lobes, of broadly lanceolate form, with a general similarity of outline to the leaf of the Horse Chestnut (Fig. 278, d). The venation, which is simple in other genera, of the Neuropterid, Pecopterid, or Taeniopterid types, is more complex in Kaulfussia, approaching that of the Drynaria-type. The roots originate internally close beneath the growing point of the stem (Fig. 279): in simple cases there may be one root to each leaf,. Fig. 275.
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. MARATTIACEAE 507 the long petiole bears five palmately disposed lobes, of broadly lanceolate form, with a general similarity of outline to the leaf of the Horse Chestnut (Fig. 278, d). The venation, which is simple in other genera, of the Neuropterid, Pecopterid, or Taeniopterid types, is more complex in Kaulfussia, approaching that of the Drynaria-type. The roots originate internally close beneath the growing point of the stem (Fig. 279): in simple cases there may be one root to each leaf,. Fig. 275. A small plant of Danaea alata. Xj. s/=stipules. (After Campbell.) but in strong plants the roots are more numerous. They take a course obliquely downwards through the tissue of the stock, finally issuing as robust roots which branch monopodially. Among Palaeozoic fossils radially constructed stems of greater length, but showing strong analogies with the stems of modern Marattiaceae, have long been known under the name of Caulopteris, when the external surface is seen in the form of impressions; or of Psaronius when the internal structure is preserved. Among other points of similarity which they show, the roots may be found traversing the cortex of these stems. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and Co. , Ltd.
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