470 103. CHAIU.OEJS. 



together at the forkings of the branchlets. — Atl. Fl. Par. 41. 

 — Very small and slender with long internodes, 1 — 4 in. high, 

 usually dark green. Branchlets forming little globose compact 

 masses, often much incrusted. Nucules globose with 9 spires, 

 minute but much exceeding the diameter of the branchlets ; 

 globules much larger. — Peaty ditches in Fens of Cambridgeshire. 



A. vm. E. 



** Globules lateral on the forhings of tlie branchlets, amongst the 

 nucules. Segments unequal. Monoecious. — Tolypella Leon. 



8. N. glomerdta (Chevall.) ; st. stoutisb, sterile branchlets 

 6 — 12 simple blunt 3 — 5-jointed, fertile branchlets many densely 

 crowded once unequally 3 — 4-forked with blunt 2 — 5-jointed 

 divisions, globules usually stalked with one or nlore nucules of 

 8 or 9 faint spires. — Atl. Fl. Far. 41. — Much incrusted and 

 brittle. — Brackish ponds and ditches chiefly. A. IV. E. I. 



9. N. proKf'era (Kiitz.) ; st. stout, sterile branchlets 6 — 20 

 simple acute 3 — 5-jointed, fertile branchlets many densely 

 crowded divided into 8 — 4 acute 2 — 4-iointed divisions, glo- 

 bules sessile (P) with one or more nucules of 9 or 10 spires. — A 

 very large plant. Branchlets even 7 inches long and vei-y 

 stout. — Very rare. Plenfield, Suss. Glasnevin, Dublin. E. I. 



10. N. intricdta (A. Br. !) ; st. stout, sterile branchlets 6 — 10 

 once or tivice divided acute, fertile branchlets many densely 

 Crowded divided once or twice into 4 — 5-celled acute divisions, 

 globules stalked with one or more nucules of 8 — 9 spires. — 

 Known by its divided branchlets. — Ponds and ditches. A. 

 IV. V. E. I 



Cha'ea Ag. 



* Stem composed of a single tube. 

 A. Stipulodes rudimentary, in one ring. Dioecious. 



1. C. stellig'era (Bauer) ; st. thick equal transparent its lower 

 nodes being white starlike knobs, branchlets 4 — 6 of 2 or 3 long 

 joints bearing 1 or 2 unequal 1-jointed bracts, stipulodes exceed- 



ngly small, nucules with 9 spires subglobose. — N. obtusa J. of 



B. xix. t. 216. — Very large, resembling N. translucens. Nucules 

 with very thick spires and very small crown. — Filbv Broad, 

 Norf. VIII. e! 



B. Stipulodes long, in one ring. Monoecious. — 

 Lychnothamntjs Rupr. 



2. C. alopeouroides (Del.) ; st. opaque, 8 — 5-jointed branch- 

 lets 6 — 8 in a whorl their terminal joints much the shortest and 



