. The algae. Algae. EUPHYCOPHYTA 231 serpensy^ and the Japanese species B. hamifera and Trailliella intri- cata. Other representatives may be strictly diplobiontic (see p. 314) since tetraspores have been reported in Delisea pulchra and D. suhrii. Helminthocladiaceae: Liagora (after one of the Nereids). Fig. 127 The axial portion of the thallus contains large cells with which are intermingled narrower rhizoidal cells. Chalk is deposited to a greater or lesser extent on the outside of the thallus so that the plants are whitish in appearance. The principal interest of the genus. Fig. 127 Liagora
. The algae. Algae. EUPHYCOPHYTA 231 serpensy^ and the Japanese species B. hamifera and Trailliella intri- cata. Other representatives may be strictly diplobiontic (see p. 314) since tetraspores have been reported in Delisea pulchra and D. suhrii. Helminthocladiaceae: Liagora (after one of the Nereids). Fig. 127 The axial portion of the thallus contains large cells with which are intermingled narrower rhizoidal cells. Chalk is deposited to a greater or lesser extent on the outside of the thallus so that the plants are whitish in appearance. The principal interest of the genus. Fig. 127 Liagora. A, carpospores of L. viscida ( x 320). B, carpo- spores in fours in L. tetrasporifera ( x 320). C, life cycle of L. tetrasporifera. (A, B, after Kylin; C, after Svedelius.) is that in four species the carpospores divide to give four spores which must presumably be regarded as tetraspores. Although no cytological evidence is available it is presumed that meiosis is delayed to the time when the carpospores divide. There is thus no independent tetrasporic diploid generation. This feature was first discovered in L. tetrasporifera, an inhabitant of the Canary Islands. A similar state of affairs has more recently been recorded for other species of Liagora and for Helminthocladia hudscni. Chaetangiaceae : Scinaia (after D. Scina). Fig. 128 This is a widespread genus with its home primarily in the north- ern hemisphere, the commonest species, S. furcellata, being ^ This is now known to be diploid (Magne, i960).. 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
