. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. SUN- AND SHADE-LEAVES 169 fresher green, owing to little decomposition of the chlorophyll (through the absence of strong light) and the greater translu- cency of the leaf ; moreover, chloroplasts are not infrequent in the epidermal cells (e.g. Bracken). In the case of hairy leaves (e.g. Yellow Deadnettlc, Dog's Mercury) the production of hairs is usually much reduced in the shade-form. A similar difference, between the exposed and sheltered parts of the same plant, is exemplified by the more numerous hairs on

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. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. SUN- AND SHADE-LEAVES 169 fresher green, owing to little decomposition of the chlorophyll (through the absence of strong light) and the greater translu- cency of the leaf ; moreover, chloroplasts are not infrequent in the epidermal cells (e.g. Bracken). In the case of hairy leaves (e.g. Yellow Deadnettlc, Dog's Mercury) the production of hairs is usually much reduced in the shade-form. A similar difference, between the exposed and sheltered parts of the same plant, is exemplified by the more numerous hairs on
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Image ID: RDWR13
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. SUN- AND SHADE-LEAVES 169 fresher green, owing to little decomposition of the chlorophyll (through the absence of strong light) and the greater translu- cency of the leaf ; moreover, chloroplasts are not infrequent in the epidermal cells (e.g. Bracken). In the case of hairy leaves (e.g. Yellow Deadnettlc, Dog's Mercury) the production of hairs is usually much reduced in the shade-form. A similar difference, between the exposed and sheltered parts of the same plant, is exemplified by the more numerous hairs on the stem-leaves as compared with the radical leaves of species having rosettes. In the Meadowsweet (Spircea iilmaria) the lower leaves, protected. Fig. 88,—Transverse sections of the sun- (A) and shade- (B) leaves of the Yellow Deadnettle (Lamiitm Galeobdolon), on the same scale, i.s., intercellular spaces ; p., palisade tissue ; s., stoma (in A, cut longitu- dinally) . among the herbage, are smooth and green on the underside, whilst the corresponding surface in the exposed upper leaves is of a greyish tinge owing to the downy felt of hairs. The cuticle and outer epidermal walls of the shade-forms are thinner than in the sun-forms, a feature which can be related to the greater humidity of the air. A comparison of strips of epidermis from the two kinds of leaves shows that the vertical walls of the epidermal cells tend to be straighter in the sun-form where the leaves are thicker (cf. p. 93). The palisade cells (Fig. 88, p.) are shorter and the number of palisade layers, as compared with lea^•es growing in bright light, exhibits rcduc-. 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 work.. Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. London, G. Bell and sons ltd.