. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. 68 MORPHOLOGY OF THE CELL. the leaves of man}- species of Peperomia, Ficus, and Begonia. Multiple epidermis is not alwa3S of even thickness throughoiit; sometimes a portion may be oiih' one or two cells thick, while adjacent portions are composed of man}- lajers. Such differ- ences are generall}- associated with the occurrence of stomata, hairs, etc. The subjacent cells in some forms of multiple epi- dermis are smaller than those above them, and in tliese eases
. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. 68 MORPHOLOGY OF THE CELL. the leaves of man}- species of Peperomia, Ficus, and Begonia. Multiple epidermis is not alwa3S of even thickness throughoiit; sometimes a portion may be oiih' one or two cells thick, while adjacent portions are composed of man}- lajers. Such differ- ences are generall}- associated with the occurrence of stomata, hairs, etc. The subjacent cells in some forms of multiple epi- dermis are smaller than those above them, and in tliese eases the arrangement of the cells in the successi\-e laj-ers presents striking inequalities. 230. Trichonies. Under this term are included the multifarious forms of hairs, scales, bristles, and prickles. Hairs are sometimes of diverse forms on the same plant, and even on the same part, but sometimes so pecu- liar and uniform throughout large genera, or even orders, that they aid in their iden- tification ; as, for instance, in MaipighiacesE, Loasacese, and Elseagnaceae. 231. Simple hairs, whether branched or unbranched, are formed by the prolongation of a single epidermal cell, either slight, forming a mere papilla, or to a great length, as in the so-called fibres of cotton. Simple hairs are abundant upon the rootlety of most plants at a little distance behind the ad- vancing tip, where they play an important part. 232. Compound hairs are of all degrees of com- plexity. They may start from a single cell, or from a group of cells, and may have the derivative cells arranged in many waj-s. The cells at or near the. 47(1 Fro. 47 a. Upper portion of a glandular hair of Mart^niiaproboscldea. if. (Martinet.) Pig. 47 6. View from above, of the upper portion of the same. i}". (Martinet) Fig. 48. Cynoglospum officinale. Longitudinal section through a young angular bristle at the beginnitig of the thickening. ={'. (Strasburger.). Please note that these images are extracted from scanned
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectplantanatomy, bookyea
