Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . detached from the succulent leavesof such plants as the Stonecrop and the Live-for-ever (Sedum) ofthe gardens. The epidermis is composed of small cells belonging tothe outermost layer of cellular tissue, with the pretty thick-sidedwalls very strongly coherent, so as to form a firm membrane. Itscells contain no chlorophyll. In ordinary herbs that allow of readyevaporation, this membrane is made up of a single layer of ce
Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . detached from the succulent leavesof such plants as the Stonecrop and the Live-for-ever (Sedum) ofthe gardens. The epidermis is composed of small cells belonging tothe outermost layer of cellular tissue, with the pretty thick-sidedwalls very strongly coherent, so as to form a firm membrane. Itscells contain no chlorophyll. In ordinary herbs that allow of readyevaporation, this membrane is made up of a single layer of cells ; asin the Lily, Fig. 221, and the Balsam, Fig. 220. It is composed oftwo layers in cases where one might prove insufficient; and in theOleander, besides the provision against too copious evaporation,already described (263), the epidermis consists of three com-pact layers of very thick-sidedcells (Fig. 222). It is generallythick, or hard and impermeable,in the firm leaves of the Pitto-sporum, Laurustinus, and otherplants, which will thrive, for thisvery reason, where those of more delicate foliage are liable to per-ish, in the dry atmosphere of our rooms in
Size: 2440px × 1024px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorgra, bookcentury1800, bookdecade1860, booksubjectbotany
