. The algae. Algae. 100 THE ALGAE * CODIACEAE: Codium (fleece). Fig. 56 This is a widely distributed, non-calcareous genus with species living in the warm and cold oceans. The spongy thallus, which is anchored either by a basal disc or else by rhizoids, varies greatly in form and appears as erect, branched, worm-like threads (C. tomentosum group), flat cushions (C. adhaerens group), or as large. 56 Codium. A, plant of C tomentosum. B, ^ utricles. C, C. tomentosum, single utricle with hairs. D, C. tomentosum, portion of thaUus with medulla and cortical utricles. E-G, stages in formatio
. The algae. Algae. 100 THE ALGAE * CODIACEAE: Codium (fleece). Fig. 56 This is a widely distributed, non-calcareous genus with species living in the warm and cold oceans. The spongy thallus, which is anchored either by a basal disc or else by rhizoids, varies greatly in form and appears as erect, branched, worm-like threads (C. tomentosum group), flat cushions (C. adhaerens group), or as large. 56 Codium. A, plant of C tomentosum. B, ^ utricles. C, C. tomentosum, single utricle with hairs. D, C. tomentosum, portion of thaUus with medulla and cortical utricles. E-G, stages in formation of constriction at base of utricle. H, propagule of C. isthmocladum. I, C. tomentosum, female gametangium. J, C. tomentosum, male game- tangium, K, C. tomentosum, juvenile thread. L, C. isthmocladum, utricle with propagule. (A, after Taylor; B, C, E-G, J, after Tilden; D, H, K, L, after Fritsch; I, after Oltmanns.) round balls (C. bursa group). In C. tomentosum there is a central medulla of narrow forked threads and a peripheral cortex of club- shaped vesicles which are the swollen apices of the forked threads. Deciduous hairs may develop on the vesicles and scars are to be seen marking their point of attachment, whilst annular thickenings occur at the base of each vesicle and at the bases of the lateral. 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
