. The algae. Algae. EUPHYCOPHYTA 117 new apical cells, but these soon cease to grow after the branch has reached a short length. At the basal node of the main plant branches of unlimited growth are produced: these arise on the inner side of the oldest lateral in the whorl, thus producing a fictitious appear- ance of axillary branching. Multicellular branched rhizoids with. Fig. 67 Charales. A, 1-6, successive stages in development of root node of Chara aspera. A, double foot joint. 2, dilation of toe of upper foot. 3, toe portion cut off. 4, 5, subdivision of toe cell. 6, rhizoids growing out.
. The algae. Algae. EUPHYCOPHYTA 117 new apical cells, but these soon cease to grow after the branch has reached a short length. At the basal node of the main plant branches of unlimited growth are produced: these arise on the inner side of the oldest lateral in the whorl, thus producing a fictitious appear- ance of axillary branching. Multicellular branched rhizoids with. Fig. 67 Charales. A, 1-6, successive stages in development of root node of Chara aspera. A, double foot joint. 2, dilation of toe of upper foot. 3, toe portion cut off. 4, 5, subdivision of toe cell. 6, rhizoids growing out. B, 1-3, successive growth stages of apex of Nitella. In i apical cell is undivided, in 2 it has divided, in 3 the lower cell has divided into an upper node and a lower internode. C, C. hispida, node with stipules. D, N. gracilis^ longitudinal sec- tion of node. E, C fragilis, branch at node with axillary bud. a = antheridium, ac= ascending corticating cells, as = apex of side branch, bnl = basal node of branch (/), c and co = cortical cells, d = descending cortical cells, i = internodal cell, n = nodal cell, 0= oogonium initial, s= stipule. (A, B, after Grove i C-E, after Fritsch.) oblique septa function as absorption organs and also serve for an- chorage. The rhizoids develop from the lowest node of the main axis, but every node is potentially capable of producing them though normally the presence of the stem apex inhibits their appearance, but if this is cut off they will then develop. This behaviour is very suggestive of an auxin control similar to that found in the higher. 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 Chapman, V. J. (Valentine Jackson), 1910-. London, Macmillan; New York, St. Martin's Press
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Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, booksubjectalgae
