5J38 103. CHAR ACE J5. 



lax, nucules 2 or 3 together with 8 or 9 spires. AtL Fl. Par. 

 40. Usually slender, flexible, light green, often [annularlyj 

 incrusted. [/3. crassa (Braun) ; st. and branchl. stouter, end-segments 

 shorter. 7. nidifica (Wallm.) ; fertile branchl. very short forming 

 compact heads, sterile branchl. often simple.] Ponds. VI. VII. E. S 



2. N. opdca (Ag.) ; dioecious, st. slender flexible transparent, 

 branchlets mucronate, fertile whorls usually dense, nucules 1 

 3 together naked ivith 6 blunt prominent spires. J. of B. xviii. 

 t. 210. Rather slender, turning nearly black. Whorls with 

 nucules dense, with globules usually more lax. [0. attenuate* (H. 

 & J. G.) ; branchlets longer and much more slender, fertile whorls lax.j 

 Ponds and ditches. A. V. VI. E. S. 1. 



3. N. capitdta ( Ag.) ; dioecious, st. slender flexible transparent, 

 branchlets mucronate, fertile whorls usually dense, nucules 

 with acute prominent spires and a mucilaginous coating. 

 Slender, yellowish brown. Globules large. Often annularly 

 incrusted. Cambs. J. <f B. xxiv. (1886) p. 1, t. 264. A. E. 



[N. syncar'pa (Chevall.) ; more slender than N. opaca with 

 simple branchlets on the female plant, and nucu'es tcith a 

 mucilaginous coating and faintly marked spires ; is probably a 

 native \] 



ft Branchlets repeatedly divided ; terminal segments of 2 or 

 more cells, last usually like a mucro. Monoecious. 



4. N. transhicens (Ag.) ; st. thick equal flexible transparent, 

 last segments of branchlets of 2 or 3 cells, sterile branchlets 

 only once divided (at the end) into 2 4 minute rays, nucules 

 small usually in threes with 7 or 8 spires. E. B. 1851. A 

 very large plant. Sterile brauchlets appear simple ; the rays 

 resemble minute points at their end. .Deep water. A. VIII. 



E. S. I. 



5. N. mucrondta (Miquel) ; st. equal flexible transparent, 

 branchlets nearly equally forked or trifid tipped with a minute 

 acutely conical cell, nucules and globules together at the forkinga 

 of the branchlets. AtL Fl. Par. 40. Katlier thick. Dark 



freen. Secondary rays once or twice forked, terminal sub- 

 ivisions rather shorter than the others. Nucules with 7 or S 

 spires. Rivers and ditches, rare. A. VII. E. I. 



6. N. grac'ilis (Ag.) ; st. equal flexible transparent, slender 

 branchlets in lax whorls twice or thrice nearly equally forked 



1 We have at present no evidence in support of this; though from it* 

 distribution the sp. is likely to occur. H. <fc J . G. 



