This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ...indications there is no evidence among living species of methods of increase in number of sporangia. Even the apical growth of the strobilus itself is, as a rule, strictly limited. Of reduction in number of sporangia there is as little direct evidence, but it is to be remembered that complete abortion leaves no trace ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ...indications there is no evidence among living species of methods of increase in number of sporangia. Even the apical growth of the strobilus itself is, as a rule, strictly limited. Of reduction in number of sporangia there is as little direct evidence, but it is to be remembered that complete abortion leaves no trace of what has occurred (see Chapter X.). On grounds to be mentioned below it would seem probable that such complete abortion of sporangiophores has figured in the evolution of the Equisetales, contributing to the origin of the initial vegetative system of the individual plant. The structure of the mature sporangiophore and of the sporangia in the Calamarians is so similar to that of Equisetum that, taken together 1 Organography, ii., p. 500. Fig. 207. EyuUetum arvensc, L. A, section traversing a sporangium in median longitudinal plane: the cells marked ( X ), like those in rig. 206, are traced in origin from segmentation of superficial cells subsequent to the first periclinal division. B, a similar sporangium cut transversely. X 200. with their insertion directly on the axis, there can be no doubt of their true homology.1 This is illustrated by Scott's figure of the sporangiophore of Calamostachys Casheana (Fig. 210), which shows the position and structure of the sporangia; but the number of the sporangia on each was, as a rule, only four. In some species there was heterospory, megasporangia and microsporangia being found even upon the same sporangiophore: this is illustrated by Scott in Calamostachys Casheana.1 He has also noted in C. Binneyana the abortion of certain spores of the tetrad:3 this, taken with the condition as seen in C. Casheana, indicates that in the palaeozoic genus "we are able to trace how heterospory originated. The fact...
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Add this copy of The Origin of a Land Flora: a Theory Based Upon the to cart. $20.75, very good condition, Sold by John C. Newland rated 4.0 out of 5 stars, ships from Cheltenham, Glos., UNITED KINGDOM, published 1967 by Hafner Publishing Co.
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Seller's Description:
Used-Very Good. Good hardback (no dust jacket) Facsimile of 1935 edition. 'Damaged' stamp on fore-edge-repaired damage at head of front hinge; binding tight; spine a little bumped at head & foot.
Add this copy of The Origin of a Land Flora to cart. $36.82, very good condition, Sold by The Guru Bookshop rated 4.0 out of 5 stars, ships from Hereford, WALES, UNITED KINGDOM, published 1908 by Macmillan.
Add this copy of The Origin of a Land Flora: a Theory Based Upon the to cart. $37.50, very good condition, Sold by West Side Book Shop, ABAA rated 4.0 out of 5 stars, ships from Ann Arbor, MI, UNITED STATES, published 1908 by Macmillan & Co., Limited.
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Very Good-Very Good + No Jacket. Thick 8vo. xi, 727 (5) pp, tissue-protected frontis, preface, Part I. Statement of the Working Hypothesis: Introduction-XX. Part II. Detailed Statement of the Facts: Introduction, XXI-XLVII; index with numerous b&w illustrations. First Edition, 1908. "The method adopted in the preparation of this work has been to examine not only the mature structure, but also the development of the organisms, and of their several parts. While fully utilising the results of Palaeontological and anatomical study, considerable weight has throughout been given to the facts of the individual development: sometimes the latter appear to oppose the former." from the Preface. Inked name ffep. Rubbed bottom fore-edge corners with some additional minor wear, mostly to spine edges. Clean, tight and strong binding with no underlining, highlighting or marginalia. Green cloth with gilt lettering to spine.
Add this copy of The Origin of a Land Flora: a Theory Based Upon the to cart. $53.42, good condition, Sold by Cambridge Rare Books rated 4.0 out of 5 stars, ships from Cambridge, Gloucestershire, UNITED KINGDOM.
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1908. Macmillan. Hard Cover. Book-Good, gilt crest on front board, gilt titles on spine, green boards, boards marked, loose frontis, t.e.g. 9x6. 727pp. Tissue-guarded frontis, many b/w illus. A detailed study which looks at how the present land flora has originated from an aquatic ancestry.
Add this copy of The Origin of a Land Flora: a Theory Based Upon the to cart. $69.14, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2009 by Cornell University Library.
