. The algae. Algae. Fig. 129 Galaxaura. Left, G. marginata ( x 3); middle, assimilators of G. marginata ( x 200); right, assimilators of G. lapidescens ( x 160). (After Borgesen.) Other Nemalionales that it may be necessary to remove the genus to a separate order. Liagora tetrasporifera, Helminthocladia hudsoni and Galaxaura do, however, show how the sporophyte may have been intercalated into the Ufe cycle. Gelidiales This is a small but relatively imiform order. The thallus is more compact than in most of the NemaHonales and all members are uni- axial in construction. True auxiliary cells are
. The algae. Algae. Fig. 129 Galaxaura. Left, G. marginata ( x 3); middle, assimilators of G. marginata ( x 200); right, assimilators of G. lapidescens ( x 160). (After Borgesen.) Other Nemalionales that it may be necessary to remove the genus to a separate order. Liagora tetrasporifera, Helminthocladia hudsoni and Galaxaura do, however, show how the sporophyte may have been intercalated into the Ufe cycle. Gelidiales This is a small but relatively imiform order. The thallus is more compact than in most of the NemaHonales and all members are uni- axial in construction. True auxiliary cells are absent but special nutritive cells are formed in association with the carpogonia. The order contains plants that provide the best sources of agar-agar in the world (see pp. 447, 451). Gelidiaceae: G^/ZJ/mw (congealed). Fig. 130 The stiff, cartilaginous thallus, which is often pinnately branched, is based primarily upon the imiaxial type of construction. This is most clearly seen at the apex, but in the older parts of the thallus it is converted to a central portion of large cells, derived from four 234. 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
