Identifier: algvolimyxophy1916west Title: Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ Year: 1916 (1910s) Authors: West, G. S. (George Stephen), 1876-1919 Subjects: Algae Publisher: Cambridge [Eng.] The University press Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library

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Text Appearing Before Image: Fig. 148. Caulerpa Holmesiana G. Murray, f natural size. rhizome-like axis, which gives off branched root-like rhizoids or holdfastsfrom its under side and foliar shoots from above. The latter are often of

Text Appearing After Image: Fig. 149. Caulerpa verticillata J. Ag. li times the natural size (after Borgesen). great beauty and may attain a length of 30 cms. The rhizome has an apicalgrowing point and is often profusely branched, but the general character of 230 Siphonales both the rhizome and the root-like holdfasts varies much in the differentspecies, depending upon the habit of the plant and the nature of itsenvironment. The necessary mechanical support for the thallus is notobtained by the interlacing of branches or by calcification, as in so many ofthe Siphonales, but mostly by the great turgidity of the ccenocyte. A denselattice-work of internal trabeculse or cross-beams traverse the lumen of thecoenocyte from wall to wall (fig. 151) and prevent any over-distention orpossible bursting. There is no cellular structure in the thallus and theplant is but a hollow mockery of the higher type which it simulates. The cell-wall is thick and distinctly lamellose, with an outermost layer which givesrise to the trabe

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