ENTEUOMORPHA. 213 



I. ENTEROMORPHA. Link. [Plate 25, D.] 



Frond tubular, hollow, membranaceous, of a green colour 

 and reticulated structure. Fructification: three or four 

 roundish granules, aggregated in the reticulations. Grev. 

 Name, svrepov, the entrail, and /wo^^jj, a form or appearance. 



1. E. Cornucopia, Carm. ; gregarious, small; fronds tu- 

 bular at the base, dilated upwards, plaited, laciniated and 

 torn at the margin. Carm. MSS. ; Hook. Br. Fl. ii. p. 313. 

 Scytonema inlestinalis, 0. Cornucopia, Lyngb. p. 67. 



On corallines, &c., in rocky pools left by the tide. Annual. Spring and 

 snmmer. " Fronds gregarious, about an inch long, funnel-shaped, from a 

 short, tubular base, expanding into a plaited, laciniated membrane, torn 

 and jagged at the extremity. Granules in fours, all over the frond. Co- 

 lour dark green below, pale above." Carm. 



2. E. intestinalis, L. ; fronds elongated, simple, inflated 

 (often floating). Grev. Alg. Brit. p. 179 ; Hook. 1. c. p. 313; 

 Wyatt, Alg. Danm. No. 80 ; Harv. Phyc. Brit. t. cliv. 0. 

 crispa ; frond compressed, the margin crisped and curled. 

 Grev. 



In the sea, and in brackish and fresh-water ditches, very common. An- 

 nual. Summer. Fronds often 2 feet long or more, and from a line to 2 

 or 3 inches in diameter, tapering at base, at first fixed by a minute root, 

 afterwards detached and freely floating, inflated, variously waved or curled, 

 of a full green colour, fading to yellowish and finally white. 



3. E. compressa, L. ; fronds elongated, branched, cylin- 

 drical or sub-compressed ; the branches simple or nearly so, 

 long, and much attenuated at their base. Grev. Alg. Brit. 

 p. 180, t. 18; Hook. 1. c. p. 314; Wyatt, Ala. Danm. No. 

 165. 0. prolifera ; frond somewhat inflated, throwing out 

 capillary branches on all sides. Grev. 



On rocks, &c., in the sea, very common. Annual. Spring and summer. 

 Fronds 6 12 inches long, either capillary or several lines in diameter, 

 more or less branched, sometimes nearly simple, sometimes very much di- 

 vided and bushy ; branches generally springing near the base, much atten- 

 uated below, gradually widening upwards and obtuse at the tips, by which 

 character this variable plant is easily recognized from the four following. 



4. E. Linkiana, Grev.; "frond cylindrical, tubular, fili- 

 form, reticulated, pellucid, of a very pale green colour, mem- 

 branaceous (rigid when dry), much branched ; branches 

 attenuated." Grev. Alg. Brit. p. 182 ; Hook. I. c. p. 314. 



In the sea. Appin, Capt. Carmichael. Annual. Summer. " Fronds 



