1 20 Rhodora (June 



is more common in the south. There has been much confusion as 

 to the plant to be called C. refracta; there seems to be no way of 

 ascertaining what was Roth's Conferva rcfracta, but Wyatt's plant is 

 without much doubt a variety of C. albida. 



C. RUDOLPHIANA (Ag.) Kl'ltZ. 



Ktitzing, Phyc. Gen., p. 268. 



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

 80. 



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



Hauck, Deutsch. Meeresalg., p. 457. 



De Toni, Syll. Alg., Vol. I, p. 321. 



Collins, Holden & Setchell, Phyc. Bor.-Am., No. 267. 

 . Conferva Rudolphiana Agardh, Flora, 1827, p. 636. 



Fronds long and loose, yellowish green, gelatinous, branches often 

 opposite, patent, flexuous, ultimate ramuli secund, tapering; cells 

 20-60 /u, diam., much longer than broad, sometimes up to 20 diame- 

 ters. 



A plant of warm, shallow bays chiefly, growing on stones or algae, 

 below low water mark, often in large quantities ; the individual 

 fronds sometimes a meter in length, always soft and gelatinous. It 

 is common from Nantucket to New York, but only occasionally 

 found north of Cape Cod; the northernmost point being Kenne- 

 bunkport, Maine. Herbarium specimens of C. Rudolphiana, C. albida 

 and some forms of C. gracilis are not always readily to be distin- 

 guished, microscopic characters only being available ; but the living 

 plants can usually be recognized. C. albida is very soft and spongy; 

 C. Rudolphiana soft but not spongy; C. gracilis, even in its slender- 

 est forms, has a certain harshness to the touch, as compared with 

 the two other species. 

 C. glaucescens (Griff.) Harv. 



Harvey, Phyc. Brit., PI. CXCVI; Nereis Bor.-Am.. part 3, p. 77. 



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



Farlow, N. E. Marine Algae, p. 52. 



Hauck, Deutsch. Meeresalg., p. 460. 



De Toni, Syll. Alg., Vol. I, p. 320. 



Farlow, Anderson & Eaton, Alg. Am.-Bor. Exsicc, No. 205. 



Collins, Holden & Setchell, Phyc. Bor.-Am., No. 817. 



Conferva glaucescens, Griffiths in Wyatt, Alg. Damn., No. 195. 



Fronds 10-40 cm. long, loosely tufted, glaucous or yellowish green, 

 much branched, ultimate ramuli long, erect, acute, sometimes secund, 

 filaments delicate, 30-60 /a diam. 



A plant of spring and early summer, found all along our coast and 

 extending south to Florida and north to Labrador. It grows both in 

 quiet bays and in tide pools on rocky shores, especially upper pools 

 where the water becomes quite warm from the sunshine between one 

 high tide and another. In these pools the natural bright glaucous 



