Yellow Green Algae Xanthophyceae

Yellow-green algae are mostly freshwater organisms, with a few marine and terrestrial representatives. The two flagella of motile cells are oriented in opposite directions. The brownish pigment fucoxanthin (found in other members of this division) is not present except in Vaucheria, an oogamous, coenocytic,

Stern-Jansky-Bidlack: Introductory Plant Biology, Ninth Edition

18. Kingdom Protista

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Kingdom Protista oogonium with egg antheridium with sperm coenocytic filament oogonium with egg antheridium with sperm coenocytic filament

Aplanospore Formation Vaucheria
Figure 18.12 Some representatives of yellow-green algae in Phylum Chromophyta. A. Vaucheria. B. Stipitococcus. C. Dinobryon.

filamentous species. Aplanospores are commonly formed during asexual reproduction; less frequently, zoospores are produced. Sexual reproduction is relatively rare, but when it does occur (as in Vaucheria), it may exhibit specialization, with oogonia and antheridia being formed on special branches (see Fig. 18.12 A).

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