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: ...In many respects the epidermis of stem and leaf clearly reflects-environmental influence. In contrast to the thick outer or free walls of the epidermal cells of land plants, we meet here with a thin walI. Surrounded by water, there is no danger of the drying up of the plant by evaporation from the epidermal cells--a ...
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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: ...In many respects the epidermis of stem and leaf clearly reflects-environmental influence. In contrast to the thick outer or free walls of the epidermal cells of land plants, we meet here with a thin walI. Surrounded by water, there is no danger of the drying up of the plant by evaporation from the epidermal cells--a process which, on the other hand, commences immediately on exposure of the plants to the air--and consequently a thick wall would here be superfluous. The fact that even in Ruppia the outer wall of the epidermal cell is slightly thicker than the others, may possibly be attributed to the necessity for some slight degree of firmness in the covering of the shoot. Besides the thinness of the walls, the epidermis of the leaf exhibits the following two remarkable peculiarities, which have already been observed in similar aquatics by Warming (1902), Schenck (1886), Goebel (1893) and others, and need not, therefore, be entered into in detail here. The light is weakened to such an extent by reflection on the surface of the water, absorption in the water, &c., that most of the chloroplasts, for the purpose of the best illumination possible, are located in the epidermal cells, which therefore assume the role of photosynthesis, but yet have not at all the shape of the palisade cells of land plants. As in the majority of other submerged plants, no stomata occur in Ruppia, nor, as already ascertained by Sauvageau (1891, II, p. 209) any of the apical leaf pores found by him in other water plants, so that openings of any kind are lacking in the epidermal covering. The reasons for this, dependent on the characteristic mode of food absorption, the lack of a transpiration current as it occurs in land plants, the extreme permeability of the leaves of aquatic pl...
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Add this copy of The Morphology of Ruppia Maritima, Volume 14... to cart. $49.69, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2012 by Nabu Press.
