. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 66 ROOT-HAIRS The general structure of the root can best be studied in a cross-section through the mature region, the Creeping Buttercup [Ranunculus repens) furnishing suitable material for a first ex- ample. Under the low power of the microscope the broad paren- chymatous cortex (Fig. 27, C), whose cells contain numerous starch-grains [s.), and the central conducting strand, are again. Fig. 27.—Transverse .section of the central part of the root of the Creeping Buttercup [Raninwiilus repens). The walls of th
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 66 ROOT-HAIRS The general structure of the root can best be studied in a cross-section through the mature region, the Creeping Buttercup [Ranunculus repens) furnishing suitable material for a first ex- ample. Under the low power of the microscope the broad paren- chymatous cortex (Fig. 27, C), whose cells contain numerous starch-grains [s.), and the central conducting strand, are again. Fig. 27.—Transverse .section of the central part of the root of the Creeping Buttercup [Raninwiilus repens). The walls of the xylem elements are shown black. C, inner part of cortex ; ea., cambium ; , companion cell ; en., endodermis ; , intercellular spaces ; p., pericycle ; , protoxylem ; s., starch ; , sieve-tube. sharply contrasted. At the edge of the section is a layer of shrunken cells (Fig. 28, r.), some of which are prolonged into shrivelled root-hairs. This epidermis withers above the zone of root-hairs and, since its chief function is their production, it is more usually termed the piliferoits layer. It is only in sections cut nearer the growing tip that its cells are as yet un- contracted, and can be seen to form a single layer. The root-hairs, each arising from a separate cell (Fig. 28, ;-.),. 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 Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. London, G. Bell and sons ltd.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpl, booksubjectplants
