HIXBLLA. 469 



2. JV. opdoa (Ag.) ; dioecious, st. slender flexible transparent, 

 branclilets mucronate, fertile wborls usually dense, nucules 1 — 

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

 t. 210. — Rather slender, turning nearly black. Wnorls with 

 nucules dense, with globules usually more lax. — Ponds and 

 ditches. A. V. VI. E. S. I. 



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

 branchlets mucronate, fertile whorls . . . . , nucules with acute 

 prominent spires and a mucilaginous coating. — Small, slender, 

 yellowish brown. — Llyn Idwal, Caern. (teste A. Braun !). 

 Stouting, Kent. A. Braun. Cornwall. A. Bennett. A. E. 



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

 simple branchlets on the female plant, and nucules with a mucin 

 lagmous coating and faintly marked spires ; is probably a na- 

 tive.] 



tt Branchlets repeatedly divided ; terminal segments of 2 or 

 more cells, last usually like a mucro. — Monoecious. 



4. N. translucens (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 branchlets appear simple ; the rays 

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



E. S. 1. 



6. N. mucrondta (Kiitz.) ; st. equal flexible transparent, 

 branchlets nearly equally forked or trifld tipped %mth a minute 

 aouitely conical cell, nucules and globules together at the forkings 

 of the branchlets. — Atl. Fl. Par. 40. — Rather thick. Dark 

 green. Secondary branchlets once or twice forked, terminal 

 subdivisions rather shorter than the others. Nucules with 7 

 or 8 spires. — Marsh-ditch near W. Grinstead, Suss. A. VII. E. 



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

 branchlets in lax whorls twice or thrice nearly equally forked 

 their terminal segments 2- or S-ceSed strongly mucronate, 

 nucules and globules each solitary but together at the forkings 

 of the branchlets.— J?. B. 2140. Atl. Fl. Par. 41.— Very small 

 and slender. Nucules subglobose with 6 or 7 spires. — St. 

 Leonard's Forest, Suss. Glen OuUen, Co. Dublin. A. IX. 



E. I. 



7. N. tenuis'sima (Kiitz.) ; st. equal flexible transparent, 

 branchlets in very dense compact subglobose whorls twice or thrice 

 equally forked in 3 — 6 segments of 2 or 3 cells their terminal 

 cell very slender and acute, nucules and globules each solitary but 



