APPENDIX. 395 



* * Plants of single cells, solitary, or united in small 

 numbers into families. (Unicellular Algse.) 

 f Solitary cells. 



13. Schizochlamys. Cells free, globular, aggregated in 

 jelly, each dividing into two or four, set free by parent- 

 cell breaking into two or four segments ; green. 



14. Chlorosphwra. Unicellular, free ; a large globose 

 cell with green contents, dividing into two, in each of 

 which is formed a new cell like the parent, set free by 

 lateral rupture of parent-cell membranes. 



15. Charaeium. Unicellular ; a minute, attached, pyri- 

 form, fusiform, or subglobose sac, shortly stipitate, con- 

 taining green protoplasm, which by oft-repeated binary 

 division forms a swarm of active two-ciliated zoospores, 

 escaping by a lateral or terminal slit. 



16. Apiocystis. Simple attached sac with stout mem- 

 brane ; green contents ; at first groups of four still go- 

 nidia, which subdivide repeatedly, and as the parent-sac 

 grows become active zoospores, which move in parent-sac, 

 and then break out in a swarm. 



17. Codiolum,. Attached, small, long, clavate sac, at- 

 tenuated below into a solid stipe, tilled with granular 

 green contents and starch granules, ultimately converted 

 at once into many gonidia, escaping by rupture of apex ; 

 gonidia globose. 



18. Hydrocytium. Attached minute oblong sac ; short 

 hyaline stalk ; green contents ; parietal starch-corpuscle ; 

 contents divided at once into many two-ciliated zoospores, 

 lying on the wall, then moving actively and breaking out 

 into a swarm. 



19. Ophiocytium. Minute, elongated, cylindric, curved 

 sac ; short stipe ; free or attached ; green contents scat- 

 tered ; finally eight gonidia in a single row, set free by 

 circumcissile rupture of end of sac. 



20. Sciadium. First a minute, solitary, attached, elon- 

 gate, tubular, stipitate sac, with eight gonidia in single 



