. Contributions from the New York Botanical Garden. Plants. 690 KupFER: Anatomy and Physiology The bast-bundles lie so close to the circle of wood — a feature according to Solereder characteristic of the Compositae — that no cambium was distinguishable as such in any portion of the stem of the growing plants. There are a number of thin-walled irregular cells between wood and bast, most of which are sieve-tubes ; but some must be of a meristematic nature, because the wood-cylin- der gradually increases in diameter so as to be about 60 mm. at a. Fig. 8. Cross-section of stem o^ Bai'i^iaris i^eni
. Contributions from the New York Botanical Garden. Plants. 690 KupFER: Anatomy and Physiology The bast-bundles lie so close to the circle of wood — a feature according to Solereder characteristic of the Compositae — that no cambium was distinguishable as such in any portion of the stem of the growing plants. There are a number of thin-walled irregular cells between wood and bast, most of which are sieve-tubes ; but some must be of a meristematic nature, because the wood-cylin- der gradually increases in diameter so as to be about 60 mm. at a. Fig. 8. Cross-section of stem o^ Bai'i^iaris i^enis/i'iloides. distance of 15 cm. from the tip, 125 mm. at 19 cm., and i56 mm. at the base of the plant examined. In an older stem taken from a herbarium specimen there were present three definite wood-rings and a very clearly established cambium layer. The wood on maceration was found to contain spiral, pitted and annular vessels. Wood parenchyma is abundant, but the medullary rays are obliterated. Around the primary bast- masses when they occur, otherwise external to the sieve tissue, an endoderm of one layer of rather large clear cells extends. Out- side of this lies the cortex, of three or more rows of chlorophyl- bearing cells. Outside of the bast-bundles, however, these cells lose their chlorophyl and become collenchymatic. The angles of the older stems from which the wings have been lost become heavily 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 New York Botanical Garden. New York : The Garden
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1899
