I9Q2] Collins, — Marine Cladophoras of New England 121 



green is changed in the upper part of the frond to yellowish green 

 or almost white. 



The C. glaucescens of the Phycologia Britannica is figured and 

 described as having articulations uniformly near three diameters. 

 The plant of northern New England has cells usually 4-6, sometimes 

 even 12 diameters, agreeing with Hauck's description. This differ- 

 ence in the length of the articulations is of little importance, other 

 characters being identical. 

 C. flexuosa (Griff.) Harv. 



Harvey, Phyc. Brit., PI. CCCVIII; Nereis Bor.-Am., part a p 78 



Le Jobs, Alg. Mar. Cherb., p. 60. * ' ' ' 



Farlow, N. E. Marine Algae, p. 54. 



Hauck, Deutsch. Meeresalg., p. 456. 



De Toni, Syll. Alg., Vol. 1, p. 311. 



Farlow, Anderson & Eaton, Alg. Am.-Bor. Exsicc, No. 206. 



C. gracilis Collins, Holden & Setchell, Phyc. Bor.-Am., No. 724. 



Not typical. 

 Conferva flexuosa Griffiths in Wyatt. Alg. Damn., No. 227 ; not of 



Dillwyn nor Jiirgens. 

 Light green, fronds 10-20 cm. high, main filaments 80-120 ^ diam., 

 branches 40-80 /a, quite regularly fiexuous, bearing alternate or 

 secund, curved and sometimes refracted ramuli ; articulations in 

 branches 2-3 times as long as broad, in main stems up to 6 diam. 

 ^Growing chiefly in rock pools, usually nearer low water mark than 

 C. glaucescens, from which it is also distinguished by a firmer texture, 

 less luxuriant branching, curved ramuli, and uniformly fiexuous fila- 

 ments. It is not so easy to distinguish well developed plants of C 

 flexuosa from small forms of C. gracilis, C. hirta or C. laetevirens, but 

 normal forms can be fairly well made out, by the difference in the 

 size of the filaments. It occurs all through our range, and as far 

 north as the Gut of Canso, Macoun, and is in its best estate in July. 

 C. flexuosa forma densa Collins ras. 



Branching of all orders very dense, texture of frond spongy. 

 In habit much like C. albida, but in dimensions of cells and form 

 of branches like typical C. flexuosa. Found growing in dense masses 

 at low water mark, Easton's Point, Newport, R. I. 

 C. gracilis (Griff.) Kiitz. 



Ktitzing, Phyc. Germ., p. 215. 



Harvey, Phyc. Brit., PI. XVIII; Nereis Bor.-Am., part 3, p. 81. 

 Farlow, N. E. Marine Algae, p. 55. 

 Hauck, Deutsch. Meeresalg., p. 457. 

 De Toni, Syll. Alg., Vol. I, p. 322. 



Farlow, Anderson & Eaton, Alg. Am.-Bor. Exsicc, No. 209. 

 Conferva gracilis Griffiths in Wyatt, Alg. Damn., No. 97. 

 Fronds up to 30 cm. long, yellowish or glaucous green, main fila- 

 ments up to 160 fx diameter, irregularly bent, branching at the angles, 



