ULVACEiE. 
57 
1 . Enteromorpha intestinalis, Link ; fronds perfectly simple, elongated, becoming 
inflated, obtuse, tapering extremely to the base. Link , Hor. Phys. Ber. p. 5. Grev. 
Alg. Brit. p. 179- Haro. Phyc. Brit. t. 154. Wyatt, Alg. Danm. No. 80. E. Bot. 
Sup. p. 2756. Kutz. Sp. Alg. p. 478. TJlva intestinalis , Linn. 
LIab. Whalefish Islands, Davis’s Straits, Dr. Lyall. Boston Bay, Dr. Gray. Provi- 
dence, Rhode Island, Mr. Olney. New York Bay, Mr. Walters, Sfc. Beesley’s Point, 
Mr. Ashmead. Sullivan’s Island, Mr. Bavenel. (v. v.) 
Very variable in the length and breadth of the frond. Old specimens are often much 
inflated and bag-like ; the frond being 1-2 inches in diameter. Others, often from the 
same locality, are not more than quarter of an inch in breadth. 
2. Enteromorpha compressa, Grev. ; fronds elongated, branched, cylindrical or sub- 
compressed ; the branches simple or nearly so, long, obtuse, much attenuated at the 
base. Grev. Alg. Brit. p. 180 t. 18. Harv. Phyc. Brit. tab. 335. Wyatt , Alg. 
Danm. No. 168. Kutz. Sp. Alg. p. 480. 
LIab. Sea shores, extremely common, (v. v.) 
Under one or other of its many forms this species is found on all parts of the American 
coast extending also up the estuaries of tidal rivers. Our most northern specimens 
were collected in Lat. 7 5° 42' by Dr. Sutherland. 
3. Enteromorpha clathrata, Grev. ; frond tubular, tesselated, cylindrical, slender, very 
much branched ; branches erect or spreading, sometimes squarrose, more or less beset 
with slender tapering subulate ramuli. Grev. Alg. Brit. p>. 181. E. clathrata, erecta 
et ramulosa, Hook. Harv. Phyc. Brit. t. 340, t. 43, and t. 245. Wyatt, Alg. 
Danm. Nos. 34, 166, and 208. E. clathrata, ramulosa, paradoxa, Sfc. Kutz. Sp. Alg. 
p. 479. 
Hab. Rock pools, &c. Rhode Island, Mr. Olney. Staten Island, New York, Professor 
Bailey. Red Hook, &c., Messrs. Hooper and Calverley. Boston Bay, Captain Pike. 
Beesley’s Point, Mr. Ashmead. (v. v.) 
Very variable in appearance, but generally more slender and filiform than E. com- 
pressa, and also more cylindrical. It is usually densely tufted, capillary, or setaceous, 
soft to the touch and very much branched ; the branches either erecto-patent or patent ; 
sometimes horizontal or squarrose, repeatedly decompound, and their ultimate divisions 
furnished with slender ramuli that taper to a fine point, and are not constricted at base. 
These ramuli are sometimes very numerous, sometimes few, and either short and spine- 
like or elongated and filiform. When short, horizontally spreading, numerous and 
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