1902] Collins, — Marine Cladophoras of New England 119 



Tufts irregular in outline, not fastigiate except in early stages. 

 Growing on rocks. 



In size and character of filaments hardly distinguishable from the 

 type, but forming, when well developed, irregular tufts, reminding 

 one of C. spinescens. It is saxicolous, and the fronds do not float 

 away bodily at maturity, like C. lanosa type, but persist in a battered 

 and unattractive state through the summer. It is found along the 

 whole New England coast. 



SUB-GENUS EUCLADOPHORA. 



All branches similar, not increasing in size upwards, terminal cell 

 short, adult cells not subdividing. 



C. albida (Huds.) Kiitz. 



Kiitzing, Phyc. Gen., p. 267. 



Harvey, Phyc. Brit., PI. CCLXXV ; Nereis Bor.-Am., part 3, p. 

 80. 



Le Jolis, Alg. Mar. Cherb., p. 59. 



Farlow, N. E. Marine Algae, p. 51. 



Hauck, Deutsch. Meeresalg., p. 458. 



De Toni, Syll. Alg., Vol. I, p. 525. 



Conferva albida Hudson, Flora Anglica Ed. 2, p. 595. 



Fronds soft, dense, pale green, filaments 20-30 //, 1 diam., cells 4-5 

 diam., delicate; branching irregular, ultimate ramuli long, p atent, 

 blunt. 1SW5 



Rather common in southern New England, usually easily distin- 

 guished by the spongy character of the frond and the slender fila- 

 ments. 



C. albida var. refracta (Wyatt) Thuret. 



Thuret in Ee Jolis, Alg. Mar. Cherb., p. 60. 



Collins, Holden & Setchell, Phyc. Bor.-Am., No. 720. 



Cladophora refracta Harvey, Phyc. Brit., PI. XXIV ■ Nereis Bor.- 

 Am., part 3, p. 79. 



De Toni, Syll. Alg., Vol. I, p. 324. 



Conferva refracta Wyatt, Algae Danmonienses, No. 228. 



Like the type in character of frond and size of filaments, but with 

 recurved branches in the upper part of the frond, set with recurved 

 ramuli. C. refracta has similar branches and ramuli, but is a much 

 coarser plant. Some forms of C. fiexuosa are puzzling, but the 

 main branches in the latter are larger than anything in C albida, 

 and neither C. refracta nor C. fiexuosa has the spongy substance of 

 C. albida. It occurs probably all along the New England coast, but 



1 When the diameter of the filament is given in this form, for species of the 

 subgenus Eucladophora, the larger dimensions are for the main filaments, the 

 smaller for the ramuli; in the subgenus Spongomorpha the normal branches 

 increase in size upward, and the larger dimensions refer to the tips. 



