. Botany for high schools and colleges. Botany. INTERNAL STRUCrUBE OF LEAVES. 157 204.—Another curious leaf structure is to be seen in Stipa spartea, the Porcupine Grass of the interior; each long harsh leaf is longi- tudinally channel- led on its upper surface, which, by the twisting of the basal portion of the leaf, becomes apparently the low- er, and the chlo- rophyll-bearing pa- renchyma is con- fined to the sides of the channels (Figs. 135 and 136). At the bottom of each channel the epider- mal cells are pe- culiarly developed into a hygroscopic tissue, which, hj contracting, closes the c
. Botany for high schools and colleges. Botany. INTERNAL STRUCrUBE OF LEAVES. 157 204.—Another curious leaf structure is to be seen in Stipa spartea, the Porcupine Grass of the interior; each long harsh leaf is longi- tudinally channel- led on its upper surface, which, by the twisting of the basal portion of the leaf, becomes apparently the low- er, and the chlo- rophyll-bearing pa- renchyma is con- fined to the sides of the channels (Figs. 135 and 136). At the bottom of each channel the epider- mal cells are pe- culiarly developed into a hygroscopic tissue, which, hj contracting, closes the channels and rolls the leaf to- gether, as always takes place in dry air. (a) Many Monocoty- ledons—as, for exam- ple, Iris and Indian corn—afford jjood spe- , ^'S- ^--Transverse secHon of the leaf of SUphivm ^ lacimatum. e, epidermis of the upper surface ;«', epi- «imen3 of very young dermis of the lower surface ; p, palisade tissue of the leaves Bv rarpfnllv J^PP"* portion of the leaf; p', palisade tissue of the ieaves. ay caremuy j^^g^ part of the leaf ; s, a stoma seeu iu transverse removing the outer section. X 235.—From a drawing by the author, leaves in succession all stages of leaf-development may be obtained. south—, with the leaf-planes parallel to the plane of the meridian- see aiticles in the American Naturalist: 1870, p. 495 ; 1871, p. 1; 1877, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bessey, Charles E. (Charles Edwin), 1845-1915. New York : H. Holt
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
