. The algae. Algae. EUPHYCOPHYTA 4I be motile and became attached. The ellipsoidal cells occur singly, or in aggregates on submerged plants or living aquatic larvae, being borne on a short stalk that emerges from a small basal disc. In most species the mature cells contain more than one nucleus. Asexual reproduction is by means of biflagellate zoospores which are liberated through a terminal or lateral aperture. Sexual reproduc- tion is generally isogamous but some species exhibit anisogamy. In C. saccatum the + and - gametes are produced from separate. Fig. 16 Characium angustatum. A, vegetat
. The algae. Algae. EUPHYCOPHYTA 4I be motile and became attached. The ellipsoidal cells occur singly, or in aggregates on submerged plants or living aquatic larvae, being borne on a short stalk that emerges from a small basal disc. In most species the mature cells contain more than one nucleus. Asexual reproduction is by means of biflagellate zoospores which are liberated through a terminal or lateral aperture. Sexual reproduc- tion is generally isogamous but some species exhibit anisogamy. In C. saccatum the + and - gametes are produced from separate. Fig. 16 Characium angustatum. A, vegetative cells ( x 650). B, cell commencing zoospore formation ( x 650), C, liberation of zoospores: the cell is probably broken accidentally ( x 650). (After Smith.) plants. They fuse to give a zygote and this, on germination, divides to produce a number of zoospores. The aUied marine algal endo- phyte genus Codiolum is interesting because one of the species, C. petrocelidis (found in the red encrusting alga Petrocelis) has recently been shown to be a phase in the Ufe cycle of a larger green alga Spongomorpha (cf. p. 87). Another species, C. kuckuckii occurs in the brown alga Splachnidium and it remains to be seen whether this too is but a phase in the life cycle of another alga. Endosphaeraceae : Chlorochytrium {chloro, green; chytrium, vessel). Fig. 17 The species grow endophytically in other plants such as mosses, angiosperms and red algae. The cells are spherical or ellipsoidal, the walls varying in thickness. Reproduction is by means of bi- flagellate gametes that normally fuse to give a motile zygote. This D. 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
