42 H. et J. Groves: 



et suhcßahm KucU. Tab. Fhijc. VII (1857) t.57, f.l et t. 76, f. 2. — 

 C. <pj)}i)i()puii rar. Berteroi Braun Fragmente (1882) p. 195; Nordsteclt 

 in ilediv/fjia 1888 p. 195 et in Act. Univ. Liind. XXV (1889) p. 40. 



Spille- cells short rarely iiiore than half the diameter of thc 

 stein. Branchlets usually 11 — 13, Avitli 9 — 12 segnients, nltimate 

 1— rj ecorticate. Two anterior pairs of bract- cells about eqiialling the 

 oogoniuin, those at the lowest node more or less swoUen. Oogonia 

 not produced at the first node. 



(3. forma eoiijuiig'ens. — C. polyphyUa rar. corijmigens Braun 

 Monatsb. Bert. Akad. 1858 p. 363. — C. gymnopa.s rar. co7?ju?ige?hs 

 Braun Fragmente (1882) p.l94. — C. conjungens Robinson I.e. p. 293. 



Interniediate between the preceding and following forms bat has 

 the bract- cells longer than in either, those at the lowest node more 

 or less swolleu. 



7. forma Michauxii. — C. polgphylla rar. Michauxii Braun in 

 Boston Journ. Nat. Hist. vol. V (1845) p. 264. — C. haitensis Turpin 

 in. Biet. Sei. Nat. (1826) Veg. Acot. t. 101. — C. Michauxii Kuetx. Tab. 

 Phyc. VII (1857) p. 31 t. 77 f. 2. — ('. ggmnopus rar. Michauxii 

 Braun Fragmente (1882) p.l95; Nordstedt in Hcduigia 1888 p. 192. 



Plaut large robust. Branchlets numerous (11 — 14) with usually 

 10 — 12 Segments, the last (or last 2) ecorticate. Bract-cells short, 

 usually the 2 anterior pairs only developed, the others papilliform. 

 Oogonia not produced at the lowest node. 



8. forma Huml)Ol(ltii. — C. compressa Kunth in Humb. B. et 

 K. Nor. Gen. I (1815) p. 38. — C. polyphtilla var. HuDiboldiiana Braun 

 in Boston Jourii. Nat. Hist. vol. V (1845) p. 264. — C. polyphylla 

 var. Humboldtii Kuetx. Sp. Alg. (1849) p. 522. — C. ggmnopus rar. 

 Hnml)oIdiii Braun Fragmente (1882) p. 196; Nordstedt l. c. p. 192, 195. 



Plant usually robust. Spine- cells often longer than the diameter 

 of the stem. Branchlets usually 11 — 12, with 9 — 11 segments, of 

 wiiich the last 1 (rarely more) is ecorticate. Bract-cells whorled, 

 anterior longer than, posterior half as long as, the oogonium. Oogonia 

 not produced at the lowest node. 



9. forma curassavica. — C. ggmnopus rar. curassarica Braun 

 Fragmente (1882) p. 198. 



Plant small. Spine- cells half to twice the diameter of the stem. 

 Branchlets 9 — 12 Avith 7 — 11 segments, the basal segment varying 

 from twice to 6 (or more) times as long as broad. Bract-cells whorled, 

 anterior pair 1 — l-'/.-; as long, others gradually narrowing to the pos- 

 terior Y:: to Y^, as long, as the oogoniuin. Oogonia often biit not always 

 produced at the lowest node. 



