. Botany; principles and problems. Botany. THE PTERIDOPII VTA 329 prostrate or subterranean, so that the leaves ai)i)ear to rise directly from the ground. In many tropical species, however, an erect trunk is produced which ])ears a crown of large leaves at its. Fig. 200.—Transverse section (diagrammatic) of the stem of a fern {Adian- tum). The fibrovascular system is here arranged in a hollow tube, the wood surrounded by bast both within and without. At the right, a segment of the cylinder is passing off to a leaf as a leaf-trace, causing a temporary break, or leaf- gap, in the cylinder. Wood
. Botany; principles and problems. Botany. THE PTERIDOPII VTA 329 prostrate or subterranean, so that the leaves ai)i)ear to rise directly from the ground. In many tropical species, however, an erect trunk is produced which ])ears a crown of large leaves at its. Fig. 200.—Transverse section (diagrammatic) of the stem of a fern {Adian- tum). The fibrovascular system is here arranged in a hollow tube, the wood surrounded by bast both within and without. At the right, a segment of the cylinder is passing off to a leaf as a leaf-trace, causing a temporary break, or leaf- gap, in the cylinder. Wood black, bast dotted. summit. The fern stem lacks a cambium, and the secondary wood and bast so common in the seed plants are consequently absent. The fibro-vascular system may occasionally be a solid. 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 Sinnott, Edmund Ware, 1888-. New York, McGraw-Hill
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1923
