By A. Engler
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Extra resources for Pflanzenreich skottsberg myzodendraceae
Sample text
In some genera they are characteristically large, and are present singly or in very small numbers in each cell. Prasinophyceae This class consists principally of unicellular planktonic organisms, and their classification is often a matter of debate. The flagellate representatives include Micromonas (Pedinomonadales) (Fig. 4) and Pyramimonas (Pyramimonadales). Micromonas, abundant in the sea, is naked. The single axoneme is unusual in that the peripheral microtubules do not ascend above the lower portion of the flagellum.
R e p ro d u c t i o n o f v o l v o x Asexual reproduction takes place by the enlargement and repeated longitudinal division of a vegetative cell so that eventually a new sphere of cells is formed bulging into the hollow center. Initially the cells of this daughter individual are oriented inversely in relation to those of the mother, but at the completion of cell division the new sphere invaginates and the orientation of the cells consequently reverses. 6. Volvox. (a) Asexual reproduction, three daughters lying within the cavity of the parent.
Growth is frequently from a welldefined apex. Representative of the simpler Florideophycidae is Batrachospermum, one of the few members of the class found in fresh water. The vegetative organization is that of a single axis bearing whorls of branches (“uniaxial”). A very similar organization is found in the green alga Draparnaldiopsis (p. 48). The filaments are enveloped in copious mucilage; this together with the dark pigmentation of the cells causes colonies of the alga in situ in ponds and streams superficially to resemble masses of frogs’ spawn.