Synopsis, revised and continued from page 2. 



* * GLCEOCARP.'E 



DlOlC^E, Habit diffuse, fruit mature in early spring or summer, membrane of 

 spore covered with coarse granules, 9, Capitata, (N. ab. E.), Ag. 



Habit strict, rather rigid, fruit in late summer or fall, membrane of 



spore delicately reticulated, 10, N. Bastini, Allen. 

 MONOIC^E, 



11. N. praelonga, A. Br. 



aa. HETEROPIIYLL/E (verticils composed of dissimilar leaves, some 



simple, others divided), 

 Verticils truly heterophyllous; membrane ofoospore granulated, 



12. N. clavata, A. Br. 



Verticils not truly heterophyllous (sterile leaves only simple or at 

 times divided); oospore smooth. 



13. N. dilatata, Allen. 



aa. FLABELLATA (leaves repeatedly divided). 



14. N. Macounii, Allen. 



B. DIARTHRODACTYL^: (ultimate segments of the leaves two-celled, the terminal 

 cell mucroniform). 



a. HOMCEOPHYLLL/E. 



DIOIC/E (no species yet known in America). 



\ MACRODACTYL/E (leaves divided once, twice of thrice ; ultimate divi- 



sions not disproportionately abbreviated). 



X SUB-FLABELLAT. (leaves once or twice divided, compare " XX ") 

 * GYMNOCARP/E. Fruit not enveloped in mucus. 

 ! CONGESTS (fertile verticils contracted, in axillary and terminal 



" heads." 

 -(- Sterile leaves terminating in a single mucronate cell (?). 



15. N. Morongii, Allen. 

 _| [_ Sterile leaves surmounted by a crown of two-celled leaflets. 



1. Small, fertile verticils terminal and axillary, lower 

 cells of the terminal leaflets inflated, short. 



1 6. N. axillaris, 



2. Larger, fertile verticils terminal, lower cell of the ter- 

 minal leaflets elongated, not inflated. 



17. N. annularis, Allen. 



NITELLA CAPITATA (N, ab. Es.) A., 1824. 



Synonyms, Chara capitata, N. ab es, 1818: (Chara capillaris 

 Krocker, Fl. Siles, 1814; name and species uncertain, name applied 

 to different species). Chara botryoides, Krocker; Chara elastica, 



