(13) Phycomycetes (Algal fungi); (I 4) Phaeophyceae (Brown Algae).
The chloroplasts are generally distinguished by their green color, which is due to the presence of chlorophyll; but in many Algae this is masked by another coloring matterPh ycoerytlsrin in the Florideae, Phycophaein in the Phaeophyceae, and Phycocyanin in the Cyanophyceae.
Phaeophyceae, or Brown Algae.
A similar uncertainty exists with reference to certain groups of Phaeophyceae, and the matter will thus arise again.
- The Phaeophyceae are distinguished by the possession of a brown colouring matter, phycophaein, in addition to chlorophyll.
- Phaeophyceae, variously magnified.
Many are epiphytic on other algae, more especially the larger Phaeophyceae and Rhodophyceae.
Similarly, while Diatomaceae may be excluded from among Phaeophyceae, though retained among algae, the Cryptomonadaceae and Peridiniaceae, like Euglena and other Chlorophyceae, may be excluded from Thallophyta and ranged among the flagellate Protozoa.
Finally, while Chlorophyceae and Phaeophyceae exhibit important affinities, the Rhodophyceae are so distinct that the term " algae " cannot be made to include them, except when used in its widest sense.
Among Phaeophyceae it is well known that the oospore of Fucaceae germinates directly into the sexual plant, and there is thus only one generation.
The only case among Phaeophyceae which has been considered to point to the existence of such a phenomenon is Cutleria.
(For the remarkable symbiotism between algae and fungi see Fungi and Lichens.) Most algae, particularly Phaeophyceae and Rhodophyceae, spend the whole of the life-cycle immersed in water.
The elaborate provision for the conduct of water from part to part which has played so important its allies, nor is it known in the whole of the Phaeophyceae and Rhodophyceae.
Other granules, easily mistaken for the " starch " granules, are also found in the cells of Phaeophyceae; these possess a power of movement apart from the protoplasm, and are considered to be vesicles and to contain phloroglucin.
The presence of phycocyanin, phyco a role in the morphological development of land plants is entirely wanting in algae, such conducting tissues as do exist in the larger Phaeophyceae and Rhodophyceae serving rather for the convection of elaborated organic substance, and being thus comparable with the phloem of the higher plants.
In the case of marine algae, the hosts are chiefly the larger Phaeophyceae and Rhodophyceae.
Kjellmann, " Phaeophyceae," in Engler and Prantl's Pflanzenfamilien (Leipzig, 1897); F.