Ser. RHoposPERME®. Fam. Rhodomelee. 
Pruate CLXXII. 
POLYSIPHONIA ATRO-RUBESCENS, Grev. 
Gen. Cuar. Frond filamentous, partially or generally articulate; joints 
longitudinally striate, composed of numerous radiating cells or tubes, 
disposed round a central cavity. Fructification two-fold, on different 
individuals ; 1, ovate capsules (ceramidia), furnished with a terminal 
pore, and containing a tuft of pear-shaped spores; 2, ¢e¢raspores, 
imbedded in swollen branchlets. PotystpHonta (Grev.),—odvs, many, 
and oper, a tube. 
PotystpHonta atro-rubescens ; filaments setaceous, sparingly or much 
branched, dark brownish-red, somewhat rigid; branches long, alter- 
nate, very erect, mostly undivided, usually furnished with a second (or 
third) set of lesser branches, naked, or clothed with short, simple or 
multifid, scattered, subulate ramuli, which taper to the base and apex ; 
articulations variable, the lower twice or thrice as long as broad, the 
upper gradually shorter, marked with several, spirally curved tubes ; 
siphons about twelve; capsules broadly ovate or subrotund, sessile, 
nearly or quite terminal ; tetraspores imbedded in multifid ramuli. 
PoLYsIPHONIA atro-rubescens, Grev. Fl. Edin. p. 308. Hook. Br. Fl. vol. ti. 
p- 331. Harv. in Mack. Fl. Hib. part 3. Harv. Man. p. 87. Harv. Ner. 
Aust. p.53. Kiitz. Phyc. Gen. p. 424. Endl. 3rd Suppl. p. 45. 
PotysipHonta Agardhiana, Grev. Scot. Crypt. Fl. t. 210. Harv. in Hook. 
Br. Fl. vol. ii. p. 331. Wyatt, Alg. Danm. no. 134. Kiitz. Phyc. Gen. 
p- 420. Endl. p. 45. 
PotysipHonta badia, Grev. Hook. Br. Fl. vol. ii. p. 331. 
PoLysipHoNta denudata, Grev. Hook. Br. Fi. vol.ii. p. 382. Endl. 3rd 
Suppl. p. 45. 
HutcuHinstia atro-rubescens, Lyngb. Hyd. Dan. p.110. Ag. Sp. Alg. vol. ii. 
p- 64. 
Hurcuinsta Agardhiana, 4. Sp. Alg. vol. ii. p. 66. 
Hurcurnsia badia, 4y.. Syn. p.56. Lyngb. Hyd. Dan. p.114. Ag. Syst. 
p- 155. 4g. Sp. Alg. vol. ii. p. 74. 
Hourcuinsia denudata, 4g. Sp. Alg. vol. ii. p. 73. 
ConFERvA nigra, Huds. Fl. Ang. p. 595. Dillw. Syn. no. 162. E. Bot. t. 2340. 
CoNnFERVA atro-rubescens, Dillw. t. 70. 
ConFERVA badia, Dill. Syn. no. 161. t. G. 
Conrerva denudata, Dillw. Syn. no. 160. t. G. 
Has. On rocks and stones in the sea, near low-water mark. Annual. 
Summer and autumn. Not uncommon. 
GeEoGr. Distr. Atlantic coasts of Europe and North America. Falkland Islands, 
Dr. Hooker. Cape of Good Hope, W. H. H. 
Descr. Root scutate. Fronds densely tufted, from three to twelve inches in 
N 2 
