1902] Collins, — Marine Cladophoras of New England 123 



that it should be retained as a varietal name, in preference to Thuret's 

 var. tenuis, published in 1863. 

 C. hirta Kiitz. 



Kiitzing, Phyc. Germ., p. 208. 



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



Hauck, Deutsch. Meeresalg., p. 456. 



De Toni, Syll. Alg., Vol. I, p. 329. 



Collins, Holden & Setchell, Phyc. Bor.-Am., No. 726. 



Filaments rather stiff, 50-200 /x diam., more or less bent, more or 

 less branched, beset throughout or nearly so with short, usually 

 secund, subacute ramuli ; articulations 2-4 diam., rarely 6. 



Somewhat resembling C. gracilis and probably having passed 

 under that name; but it is coarser than most forms of the latter, and 

 has not the long slender ramuli at the tips of the branches. The 

 extent of ramification varies much, some forms having filaments a 

 decimeter long with no branches other than the short ramuli which 

 occur, several on one side and several on the other, or sometimes 

 nearly all on one side, over the whole or the greater part of the 

 frond. Sometimes the tip of a branch is quite bare, while all the 

 lower part has the secund ramuli. 



It occurs throughout our range, mostly in rather exposed places, 

 but seems to be not so common as some other species ; this, however, 

 may be due to its having only recently been distinguished from C. 

 gracilis in this country. 

 C. expansa (Mert.) Kiitz. 



Kiitzing, Tab. Phyc, Vol. Ill, p. 27, PL XCIX. 



Le Jolis, Alg. Mar. Cherb., p. 61. 



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



Hauck, Deutsch. Meeresalg., p. 462. 



De Toni, Syll. Alg., Vol. I, p. 319. 



Farlow, Anderson & Eaton, Alg. Am.-Bor. Exsicc, No. 210. 



Collins, Holden & Setchell, Phyc. Bor.-Am., No. 121. 



Conferva expansa Mertens in Jiirgens, Decade 8. 



Fronds dull green, loosely branched, the main branches 100-150 fx 

 diam., flexuous, with smaller, patent, secondary branches, divaricately 

 divided ; ultimate ramuli 40 fx diam. secund, blunt, articulations 3-6 

 diam. ; at first attached but soon loosened and floating. 



Common in shallow pools and especially in lagoons where the 

 water is warm and the level varies little ; here it forms a thick felty 

 coating on the surface of the water, usually in company with Lyngbya 

 aestuarii and species of Enteromorpha. It is found throughout our 

 whole range. 

 C. expansa var. glomerata Thuret. 



Thuret in Le Jolis, Alg. Mar. Cherb., p. 61 (without description). 



Ultimate ramuli in closely set tufts; quite different in habit from 

 the type, but evidently not specifically distinct. 



Bridgeport, Conn., Isaac Holden. 



