. A textbook of botany for colleges and universities ... Botany. LEAVES 571 under leaf surface, where the stomata are the more abundant. The leaves of many desert xerophytes (as in the creosote bush) are coated with resin, and often have a varnished aspect, shining in the sun- light. Many tropical forest leaves also are shiny. The factors influ- encing the formation of resin coats are unknown. Like wax coats, they may retard transpiration, and it has been suggested that they reflect light, an excess of which may injure the chlorophyll. It has been shown that shiny leaves become more slowly hea
. A textbook of botany for colleges and universities ... Botany. LEAVES 571 under leaf surface, where the stomata are the more abundant. The leaves of many desert xerophytes (as in the creosote bush) are coated with resin, and often have a varnished aspect, shining in the sun- light. Many tropical forest leaves also are shiny. The factors influ- encing the formation of resin coats are unknown. Like wax coats, they may retard transpiration, and it has been suggested that they reflect light, an excess of which may injure the chlorophyll. It has been shown that shiny leaves become more slowly heated in the sunlight. 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 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
