. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. EPIDERMIS. 37 cavity situated beneath the stoma is directly bounded by the lateral walls of the neighbouring epidermal cells, the leaves of Orchis latifolia (Von Mohl, /. c), the very large-celled epidermis of the leaf of the Comraelinacese (Strasburger, /. c. Fig. 150), Claytonia perfoliata (1. c. Fig. 120), and many others. More commonly where the height is unequal, the guard-cells lie so that their inner walls fall approximately in the same plane as those of the epidermal cells (comp. Fi
. Comparative anatomy of the vegetative organs of the phanerogams and ferns;. Plant anatomy; Ferns. EPIDERMIS. 37 cavity situated beneath the stoma is directly bounded by the lateral walls of the neighbouring epidermal cells, the leaves of Orchis latifolia (Von Mohl, /. c), the very large-celled epidermis of the leaf of the Comraelinacese (Strasburger, /. c. Fig. 150), Claytonia perfoliata (1. c. Fig. 120), and many others. More commonly where the height is unequal, the guard-cells lie so that their inner walls fall approximately in the same plane as those of the epidermal cells (comp. Figs. II, 18, &c.). They form then the bottom of a depression, through which one approaches the stoma from without. This is surrounded by the neighbour- ing epidermal cells, and is often over-arched at its outer margin by outgrowths of these, so that the mouth is considerably reduced. This is the case in the majority of tough-skinned leaves and green stems; leaf of Polypodium lingua ^ Equiseta cryptopora (comp. our Fig. 23, Sanio, Linnaea 29, 385, Taf. III. Milde, Mono- graphia Equisetor.), Coniferse 'â ', Cycadese (Kraus. /. c), Monocotyledons, as Aloe", Agave \ Dasylirion, Hechtia ^ Iris », Allium, Orchidaceee, &c., and Dicotyledons, as. Fig. 12.âPholidopliyllura zonatum, adult leaf, under surface. A superficial view of a piece of Epidermis with a stoma and its subsidiary cells. B median transverse section through a stoma; the guard-cells are pushed outwards by tlie lateral subsidiary cells, which have been pushed down beneath them (390). Ficus elastica'', australis, Proteaceaj', Nelunibium", Dianthus Caryophyllus, and many others. Independently of this relation of height the case occurs that the surrounding epidermal cells are so pressed against the stoma that the latter rises a greater or less distance into the air above the outer surface of the epidermis, e. g. leaves of Chrysodium vulgare ", Aneimia Phyllitidis, hirta", Pholidophyllum zonatu
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Keywords: ., bookcentury1800, bookdecad, booksubjectplantanatomy, bookyear1884
