382 THE MICROSCOPIST. 



ovate spores, and tufts of antheridial cells (?) attached to 

 the lateral ramuli, which consist of minute, radiating, 

 dichotomous, beaded filaments. Fresh-water plants. 



1. Batrachospermum. Lateral whorled ramuli, beaded 

 spores in globular knobs in the whorls. 



1. B. moniliform. Color various, vaguely branched. 



2. B. giganteum. Large, purple when dry, long, bifur- 

 cated branches. 



3. B. affine. 



4. B. coerulescens. ^Eruginous, slender, branched. 

 Upper and lower whorls confluent. 



5. B. vagum. Dichotomously branched, equally thick 

 throughout ; whorls all confluent. 



2. Thorea. Stems continuous, whorled, articulated, 

 sometimes branched, ramuli cylindric, the spores at their 



3. CH^ETOPHORACE^:. In the sea or fresh water, coated 

 by gelatinous substance, either filiform or (connected fila- 

 ments) gelatinous, definitely formed or shapeless fronds 

 or masses. Filaments jointed, bearing bristlelike pro- 

 cesses. Fructification, zoospores from cell-contents of fila- 

 ments, resting spores from particular cells after impregna- 

 tion by ciliated spermatozoids produced in antheridial cells. 



1. Draparnaldia. Filaments free, primary nearly color- 

 less, with tufts of colored ramuli at the joints ; zoospores 

 formed singly in the joints of the ramuli. 



2. Ch&tophora. Filaments dichotomously branched, 

 aggregated into shapeless, incrusted or branched, gelati- 

 nous fronds, the joints bearing bristlelike branches. 

 Zoospores (four cilia) solitary in the articulations, mem- 

 branes of filaments very fugacious. (Little green protu- 

 berances on sticks, etc., in fresh water.) 



C. endivicefolia. C. tuberculosa. C. elegans. C. pisiformis. 

 C. dilatata. C. longceva. 



3. Coleoch(Ete. Frond disk-shaped or irregularly ex- 



