42 SPECIES OF ALGjE. 



§ Oogonia globose or nearly so (A). 



§ " ellipsoid or nearly so; oospores longitudinally crenulate- 



costate (F). 

 A. Dwarf males i celled, on or near the oogonia, elachistandra, 97 



A. " " 2 celled (B). 



B. Basal part (stem) of dwarf males, shorter than the spermogonia (C). 



B. " " " " " " longer than the spermogonia; 

 oospore warty ... gigantea, 99 



C. Diameter of veg. cells 20/i or less (D). 



C. " " " " more than 2o/<; oospore granulate, 



setigera, 98 



D. Oogonia without terminal seta intermedia, 97 



D. " with terminal seta, or beneath a male cell (E). 



E. Dissepiment supporting oogonia in the middle of cell or slightly 



below . . crenulata, 97 



E. Dissepiment above the middle of the cell .... polyandra, 98 



E. " below the middle ... . . Brebisonii, 99 



F. Monoecious (G). 



F. Dioecious (H). 



G. Diameter of oogonia '2.'i-Z'ilJi by 46-56/* . . . mirabilis, 100 

 G. " " " 20-25/^ by 33-36/* .... nana, 100 

 H. Dissepiment of cells supporting oogonia obsolete (I). 



H. " " " " " present (J.) 



I. Diameter veg. cells 12-5/t, length less than diameter, /j/^/««a, loi 



J. Diameter veg. cells i6/t or less (K). 



J. " " " more than 16/i (L). 



K. Veg. cells 1-1.5 times as long as wide . . . subsimplex, loi 



K. " " 2-3.5 " " " " " .... repanda, 102 



K. " " 1.5-2 " " " " " . rhadinospora, 103 



L. Veg. cells 2.5-4.5 times as long as wide . . . insignis, loi 



L. " " 1.5-3 " " " " '1 minor, loi 



L. " " 1.25-3 " " " " " . . rectangularis, 102 



12. SPH^ROPLEA. 



Cells 8-10-20 times as long as broad, chlorbphyllose rings 20-30 In 

 each annulina, 104 



13. CYLINDROCAPSA. 



Ends of cells clear and pearly amxna, 105 



Ends of cells not clear . . . . . . geminella, 104 



