Systematic Anatomy of the Dicotyledons; Introduction. Polypetalae. Gamopetalae Volume 1

Systematic Anatomy of the Dicotyledons; Introduction. Polypetalae. Gamopetalae Volume 1

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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 edition. Excerpt: ... Neuseeland, in Engler, Bot. Jahrb., Bd. xxii, 1896, p. 355.--Grevillius, in Engler,"Bot. Jahrb., Bd. xxiii, 1896, p. 98.--Rosenberg, Anatomisk. byggn. hos Parnastia, Bot. Notiser 1896, pp. 333-7.--Kuhla, Phelloderm, Bot. Centralbl. 1897, iii, p. 165. CRASSULACEAE. 1. Review Of The Anatomical Features. The stomatal apparatus is characteristic of most members of the Order, the pair of guard-cells being surrounded by a simple or multiple girdle of three subsidiary cells. In addition to the air-pores (stomata), water-pores occur in many cases. A hairy covering is rare, but curiously-shaped bladders (Rochea) and glandular hairs have been observed. Oxalate of lime is excreted in the form of ordinary solitary crystals, sphaerites and crystal-sand; the latter either occupies the lumen (Cotyledon, Sedum), or is embedded in the membrane (Crassula, Rochea, Sempervivum) of the cell. Tannin is frequently present in the Order, and is occasionally stored up in special cells, which are distinguished either by their small size or by their development as long sacs; in the leaf the latter are found, especially in the epidermis or in the subepidermal layer of cells. As regards the structure of the axis, the secondary vessels, which are always enclosed in unlignified tissue, have simple perforations and simple-pitted walls; the wood-prosenchyma bears simple pits. The appearance of the xylem in transverse section varies, inasmuch as the thin-walled groups of tissue, together with the secondary vessels and the wood-prosenchyma, may or may not be present, and inasmuch as both may be concerned to a varying extent in the formation of the xylem. Medullary rays are rarely developed. Where cork occurs, its formation takes place in a superficial layer of cells. more

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  • Paperback | 412 pages
  • 189 x 246 x 21mm | 730g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236644492
  • 9781236644497