250 BOTANY. 



the filaments in the one case {Bulbochmte) being branched and terminatedf 

 with setse, while in the other case (CEdogonium and its alliss) the fila- 

 ments are not branched, and are destitute of true seta). 



(J) The old genua CEdogonium is divided by Wood into three new 

 genera, as follows : 



Monoecious : antheridia and oogonia upon the same individual — 



(Edogonium. 

 Dioecious : antheridia and oogonia arising upon distinct individuals 



— Pringsheimia. 

 Gynandrous : antheridia upon dwarf plants, growing attached t<v 

 the female plant — Atidrogynia. 

 Wolle records thirteen species of the first, thirteen of the second, 

 and twenty-six of the third of the foregoing divisions in the United 

 States. He does not, however, consider these divisions as having 

 generic rank. ("Fresh-water Algse of the United States," Vol. I. 

 p. 66.) 



(c) The genus BulboehwU includes gynandrous species, of which, 

 there are sixteen in the United States. 



§ III. Class Oceloblasteje. 



333.— In the plants of this class the protoplasm is con- 

 tinuous throughout the vegetative organs of the plant, and 

 is not divided into cells. Only the reproductive organs are- 

 separated by partitions. They may hence be spoken of as 

 unicellular, although they often attain a considerable lengtk 

 and are frequently much branched. 



The other characters of the group will be best understood 

 from a study of some of the plants included in it. Many of 

 them are chlorophyll-bearing plants, living in brooks and 

 streams, while others are destitute of chlorophyll, and are 

 saprophytes, living upon decaying animal or vegetable matter, 

 or are parasites, living upon the living tissues of the higher 

 plants. 



334. — The genus Vauclieria may be taken as a represen- 

 tative of the chlorophyll-bearing members of this class. It 

 is a filamentous alga growing in water or on damp earth, and 

 forming dark green tufts. Each plant consists of long, 

 branching, thick-walled tubes, which have a rather large 

 diameter ; they are attached to the earth, or to sticks or 



