. The algae. Algae. EUPHYCOPHYTA 23 Carteria ovata (cf. also p. 427), but it has now been demonstrated that the two species represent the haploid and diploid somatic phases respectively of one species. Whether these examples repre- sent a true alternation of generations or whether they must be regarded as possessing a special type of zygote will be considered later (seep. 312). The genus is widespread, the various species occurring prin- cipally in small bodies of water, in sewage oxidation lakes (see p. 453) and in the soil. Within the family Chlamydomonadaceae there is a considerable variety
. The algae. Algae. EUPHYCOPHYTA 23 Carteria ovata (cf. also p. 427), but it has now been demonstrated that the two species represent the haploid and diploid somatic phases respectively of one species. Whether these examples repre- sent a true alternation of generations or whether they must be regarded as possessing a special type of zygote will be considered later (seep. 312). The genus is widespread, the various species occurring prin- cipally in small bodies of water, in sewage oxidation lakes (see p. 453) and in the soil. Within the family Chlamydomonadaceae there is a considerable variety of forms. Among those which lack a true cell wall is the pear-shaped, 4-ciHate Polyhlepharides and the biciliate Dunaliella. In Phacotus the chlamydomonad cell is surrounded by a special outsize hardened envelope which is flattened in side view. Polytoma is a colourless member of the family but nevertheless produces starch as its food reserve. * Sphaerellaceae : Sphaerella (sphaer, ball; ella, diminutive of affection). Fig. 3 B. Fig. 3 Sphaerella lacustris {Haematococcus pluvialis). A, diagram of single macrozoid. b = blepharoplast, c = chloroplast, ct =flagelluin tube, cw =cell wall, n = nucleus, nu = nucleolus, p =pyrenoid, ps = protoplasmic strand, r = rhizoplast, 5= stigma. B, encysted plant with haematochrome in centre. C, eight-celled palmelloid stage. D, diagram Illustrating life cycle in bacteria-free cultures. (After Elliott.). 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
