446 102. oHAEACD^i 



' '• ]. Cha'ea 2>inn. ' > ' ,, 



I. NiTELlA Ag. — Crown of nucule of, 10 cetl^ forming; 2 cir- 

 cles lying upon ea&li other,, never spreading, generally falling oii' 

 Ijefore the nyicule,,i8 ripe. Stern? more or less pellucid, cpm- 

 posed! of one tube. , , , 



' i. ■ Mt'ella. Globules terminal at the forks of the branchlets,- 



* Brdiichlets only once divided into 1-jointed segments, 

 6-^ in a whorl, similar. 



. , 1. C.flex'ilis (L.) ; monoecious, st. slender equal flexible transr 

 parent, branehlets pointed' not, mucrcmate nearly equally forhed 

 or trifid, nucules and globules together in the forks of the 

 branchlets -yyithout bracts.—^. B. 1070. ' Atl. Fl. Par. 40 C— 

 Rather slender, green, pellucid. Primary branctes seldom more 

 than once divided. Sometimes the axillary branchlets are much 

 more divided and clustered ( C. nidijica of collectors). Nucules 

 with 6 strise.^Ditches. P. V. < E. S. 1. 



3. C. syncar'pa (Thuil.) ; dioecious, st. slender equal flexible 

 transparent, branchlets bluntish apicvlate nearly equally forhed 

 pr trifid, nucules or globules at the forks of the branchlets with- 

 out bracts. — Atl. Fl. Par. 39 (not good). — Slender, diaphanous, 

 resembling C.Jlexilis. Nucules with 5 strise and scarcely any 

 crown.— Stagnant water. A. V. E. S. 1. 



** Branchlets usually' repeateXy divided, terminal segments of 2 

 joints', last Joint usually like w mucro. Branchlets 6—8 in a 

 ■ whorl, similar. . , ■ ■ 



3. C. transUeens (Pers.) ; moncecious, St. thick equal flexible 

 transparent, sterile branchlets simple not jointed, upper ones ending 

 in 2 (^ 3 short points, fertile whorls of small trifid branchlets 

 very small and closely placed, nucules small oblong usually in 

 threes just below the prongs of the branchlet which surround 

 the terminal globule.— J5. B. 1855. Atl. Fl. Par. 40 B.— Strong. 

 Fertile whorls appearing capitate. Globules solitary. Nucules 

 with 7 striffi.^-Deep stagnant pools. A. Vll. E. S. 1. 



4. C. mucriondta (A. Br.) j monoecious, st. slender equal flex- 

 ible transparent, branchlets strongly mucronate nearly equally 

 forked or trifid, nucules and, globules together at the forks of the 

 branchlets without bracts, — Atl. Fl. Par, 40 D. — Rather thick. 

 Secondary branchlets once or twice forked, terminal subdivisions 

 rather shorter than the others. " Nucules with 4 or 5 strise." — 

 Marsh ditch, W. Grinstead, SUss. Mr. Borrer. A. VII. E. 



5. C. grac'ilis (Sm.) ; monoecious, st. slender equal flexible 

 transparent, branchlets in lax whorls repeatedly divided into 3 



