. An introduction to the study of seaweeds. Algae. Fig. 5.—a, Notheia anomala gi'owing on Horviosira, half natural size ; 6, sec- tion of Notheia, showing origin of lateral branch from the hase of a conceiitacle ; c, oogonium; d, section of junction of Notheia with Hormosira. b, c, and d highly magnified. (After M. O. Mitchell, in Phyc. Mem.) dimple in the surrounding tissue, and both three- and four-sided cells occur in different genera. Oltmanns, in his classification of the genera of this order, attaches an importance to this three- or four- sided character which is hardly justified by its
. An introduction to the study of seaweeds. Algae. Fig. 5.—a, Notheia anomala gi'owing on Horviosira, half natural size ; 6, sec- tion of Notheia, showing origin of lateral branch from the hase of a conceiitacle ; c, oogonium; d, section of junction of Notheia with Hormosira. b, c, and d highly magnified. (After M. O. Mitchell, in Phyc. Mem.) dimple in the surrounding tissue, and both three- and four-sided cells occur in different genera. Oltmanns, in his classification of the genera of this order, attaches an importance to this three- or four- sided character which is hardly justified by its proved inconstancy in less plastic forms than those of Algae. The occurrence of air-vesicles is not characteristic of particular genera, and hardly even of 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 Murray, George Robert Milne, 1858-1911. London, New York, Macmillan
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