. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. Fig. 333 A. Dennstaedtia (Dicksonitz) punctiloba. Din- gram of vascular system of rhizome, including a node and the base of a leaf-trace. The upper surface of the rhizome would face the observer. (After Gwynne-Vaughan.) Dennstaedtia (Dicksonia) adiantoides. Diagram of vascular system of rhizome, including a nude and the base of a leaf-trace. = lateral shoot arising from basiscopic margin of leaf-trace: =ridge upon internal surface of solenostele. The upper surface of rhizome would face the
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. Fig. 333 A. Dennstaedtia (Dicksonitz) punctiloba. Din- gram of vascular system of rhizome, including a node and the base of a leaf-trace. The upper surface of the rhizome would face the observer. (After Gwynne-Vaughan.) Dennstaedtia (Dicksonia) adiantoides. Diagram of vascular system of rhizome, including a nude and the base of a leaf-trace. = lateral shoot arising from basiscopic margin of leaf-trace: =ridge upon internal surface of solenostele. The upper surface of rhizome would face the observer. (After Gwynne- Vaughan.) prove to be essentially solenostelic : similarly all the reputed species of Microlepia that have been examined are also typically solenostelic, with two exceptions only : one of these is Davallia {Microlepia) hirsuta, Hk., which is dorsiventrally dictyostelic, and this appears structurally out of place among the Microlepias : an examination of its sorus, however, shows that the plant is one of the Mixtae : thus both the anatomy and the state of the sorus show that its proper place is elsewhere, probably with Davallia. The other exception is Davallia (Microlepia) pinnata, Cav., which appears to have relations anatomically rather with Lindsaya. Excluding these it may be said then that solenostelic structure is typical for Dennstaedtia and Microlepia. The vascular relations of leaf and axis are indicated by the Figs. ^^ a, e, c. The leaf-trace is in all cases an undivided ribbon-like strand : where it is inserted upon the tubular solenostele the latter opens, forming the foliar gap, which is here only short, and soon closes (Fig. 333 a). Aim. of Hot., xvii., p. 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 an
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