. A textbook of botany for colleges and universities ... Botany. Fig. 8ii.—-A surface view of a part of the under epidermis of a leaf of Coleus, showing the wavy lateral walls characteristic of the under epidermis of mesophytic dicotyl leaves; the shaded cells contain anthocyan; note the sto- mata with their crescentic guard cells, chloroplasts, and central slit; highly Fig. 8i2. —A surface view of a part of the upper epidermis of a leaf of Coleus, showing the straight lateral walls character- istic of the upper epidermis of mesophytic dicotyl leaves; note the absence of an- thocya
. A textbook of botany for colleges and universities ... Botany. Fig. 8ii.—-A surface view of a part of the under epidermis of a leaf of Coleus, showing the wavy lateral walls characteristic of the under epidermis of mesophytic dicotyl leaves; the shaded cells contain anthocyan; note the sto- mata with their crescentic guard cells, chloroplasts, and central slit; highly Fig. 8i2. —A surface view of a part of the upper epidermis of a leaf of Coleus, showing the straight lateral walls character- istic of the upper epidermis of mesophytic dicotyl leaves; note the absence of an- thocyan and of stomata; magnification as in fig. Sii. than do similar leaves that are not shiny, so that evaporation probably is reduced thereby. Floating leaves (as in the water lilies) often have waxy or resinous sur- faces, which are highly advantageous in that they prevent the wetting of the stoma-bearing surface, thus facilitating gas exchanges. Many meso- phytic leaves also (as in the meadow rue) are not readily wetted, their silvery aspect when thrust into the water being due to an air film next to the waxy surface. Probably few stomatal surfaces are readily wetted, contrasting thus with the surfaces of submersed leaves and with the stoma-free upper surface of many tropical leaves. The lateral walls. — In mesophytic dicotyls the lateral epidermal walls commonly are straight on the upper leaf surface and irregularly wavy on the lower or stoma-. 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 Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
