American fossil cycads Volume No. 34,т. 1 - 5 Angebote vergleichen

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Von Händler/Antiquariat, BuySomeBooks [52360437], Las Vegas, NV, U.S.A.
This item is printed on demand. 132 pages. Dimensions: 9.7in. x 7.4in. x 0.3in.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. 1906 Excerpt: . . . general features of the non-expanded or preflorate disk will be apparent. In the longitudinal section a heavy petiolar and rachial axis (r, figure 72) rises from the base of the ovulate cone (c) to some distance beyond its summit, and then curves inward and is once deflexed, so that the downwardly turned apical third of its length, which is at first narrow and then widens into a broad spatulate tip, rests on the surface of the central cone. Although the middle region of the rachis, that is, the part curving inward and then downward at the summit of the strobilus, is often eroded away, as the result of its being the highest and most exposed portion, the relations just described would clearly be seen to be the true ones, even if we did not know the intact disk of C. ingens type shown on plate ni. In several of the present series of sections preservation of the middle region of the fronds forming the summit of the unexpanded strobilus is, however, nearly complete. The space interior to the once-deflexed fronds is densely packed with well-developed synangia borne on slender pinnules, which are folded rankwise in the radial position in such a manner that it has been possible to carry the grinding of the median longitudinal section 360 to such a plane that all the fertile pinnules not only may clearly be seen attached to the rachial axis at regular intervals from its base to near its tip, but are mostly cut throughout their entire length, and alternate with rows of densely appressed synangia. But in this section only a few rows of synangia are seen attached, the most of the alternating rows being free, as clearly appears in photograph 2, plate xxxv1. Fig. 75. --Continued. c. S. 483. Cut I. 5 centim-ters beneath S. 482. In this transverse section twoadrl1tional leaf. . . This item ships from La Vergne,TN.

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Von Händler/Antiquariat, super_star_seller.
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. 1906 Excerpt: ...general features of the non-expanded or preflorate disk will be apparent. In the longitudinal section a heavy petiolar and rachial axis (r, figure 72) rises from the base of the ovulate cone (c) to some distance beyond its summit, and then curves inward and is once deflexed, so that the downwardly turned apical third of its length, which is at first narrow and then widens into a broad spatulate tip, rests on the surface of the central cone. Although the middle region of the rachis, that is, the part curving inward and then downward at the summit of the strobilus, is often eroded away, as the result of its being the highest and most exposed portion, the relations just described would clearly be seen to be the true ones, even if we did not know the intact disk of C. ingens type shown on plate ni. In several of the present series of sections preservation of the middle region of the fronds forming the summit of the unexpanded strobilus is, however, nearly complete. The space interior to the once-deflexed fronds is densely packed with well-developed synangia borne on slender pinnules, which are folded rankwise in the radial position in such a manner that it has been possible to carry the grinding of the median longitudinal section 360 to such a plane that all the fertile pinnules not only may clearly be seen attached to the rachial axis at regular intervals from its base to near its tip, but are mostly cut throughout their entire length, and alternate with rows of densely appressed synangia. But in this section only a few rows of synangia are seen attached, the most of the alternating rows being free, as clearly appears in photograph 2, plate xxxv1. Fig. 75.--Continued. c. S. 483. Cut I.5 centim-ters beneath S. 482. In this transverse section twoadrl1tional leaf... Paperback, Label: RareBooksClub.com, RareBooksClub.com, Product group: Book, Published: 2012-05-18, Studio: RareBooksClub.com, Sales rank: 11592300.

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Von Händler/Antiquariat, Ergodebooks.
RareBooksClub.com, 2012-05-18. Paperback. Good.

Von Händler/Antiquariat, Ergodebooks [8304062], RICHMOND, TX, U.S.A.
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Von Händler/Antiquariat, ExtremelyReliable, TX, Richmond, [RE:3].
Paperback.