. The algae. Algae. EUPHYCOPHYTA 29 of a sphere with 500-60,000 biflagellate cells set around the peri- phery, the flagellae emerging through canals. The actual number of cells in a colony varies from species to species. The interior of the colony is mucilaginous ( V. aureus) or else merely contains water ( V. globator), whilst the entire collection of generally ovoid cells is bounded on the outside by a firm mucilaginous wall. The individual cells, each containing two to five contractile. Fig. 8 Volvox. A,V. aureus with daughter colonies. B, structure of V. aureus as seen in section.
. The algae. Algae. EUPHYCOPHYTA 29 of a sphere with 500-60,000 biflagellate cells set around the peri- phery, the flagellae emerging through canals. The actual number of cells in a colony varies from species to species. The interior of the colony is mucilaginous ( V. aureus) or else merely contains water ( V. globator), whilst the entire collection of generally ovoid cells is bounded on the outside by a firm mucilaginous wall. The individual cells, each containing two to five contractile. Fig. 8 Volvox. A,V. aureus with daughter colonies. B, structure of V. aureus as seen in section. C, surface view of single cell of V. rousseletii ( x 2000). D, the same in side view ( x 2000). (A, B, after Fritsch; C, D, after Pocock.) vacuoles, in some species are surrounded by distinct individual sheaths, the middle lamellae of which form a polygonal pattern when stained with methylene blue. In some species too the cells are united by deHcate cytoplasmic threads, or plasmodesmae. In V. glohator and V. rousseletii the cells are *sphaerelloid' in nature, each individual cell being enclosed in a separate envelope, whilst in V. aureus a number of individual chlamydomonad cells are en- closed in wedge-shaped prisms, which morphologically may be equivalent to an original mother cell. It has therefore been sug-. 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
