242 ALGM CHLOROSPERME^E. [Ulva. 



78. ENTEROMORPHA. Link, Enteromorpha. 



Frond tubular, hollow, membranaceous, of a green colour and 

 reticulated structure. Fructification : three or four roundish 

 granules, aggregated in the reticulations. Grev. Name ; 

 ei>Tc/?oj/, the entrail^ and /to/>0?/, a, form or appearance. This 

 genus chiefly differs from Ulva in its tubular and much 

 branched frond. 



1. E. intestinalis, Link. Intestinal Enteromorpha. Fronds 

 elongated, broadly linear, inflated and sinuated, simple (often 

 floating.) Grev. Hook. Br. FL. v. ii. p. 314. 



On the shore, and in ditches and pools, both of salt and fresh water. 



2. E. compressa, Grev. Compressed Enteromorpha. Frond 

 tubular, linear or filiform, simple or branched, subcompressed, 

 the branches elongated, attenuated at the base. Grev. Hook. 

 Er.Fl.v.ii. p. 314. 



Sea-shores, common. 



3. E. clathrata, Grev. Latticed Enteromorpha. Frond 

 much and irregularly branched, slender, filiform, reticulated ; 

 branches attenuated to a fine point. Grev. Ala. Br. p. 181. 

 Hook. Br. Fl. v. ii. p. 318. (also E. erecta, and E. ramulosa, 

 Hook. 1. c. )Conf. paradoxa, Dilliv. E. Bot. t. 2328. Ulva 

 ramulosa, E. Bot. t. 2137- 



Sea-shores. This is distinguished by its latticed frond, and atte- 

 nuated branches. 



79. ULVA. Linn, (part of.) Ulva, or Laver. 



Frond membranaceous, of a green colour, plane (in some cases 

 saccate, and inflated in the young state.) Fructification: 

 minute granules, mostly arranged in fours. Grev. Name ; 

 supposed to be from Ul, water, in Celtic. 



* Marine. 



1. U. latissima, Linn. Broad Ulva or Laver. Frond broadly 

 ovate or oblong, flat, delicately membranaceous, of a full-green 

 colour. Hook. Br. Fl. v. ii. p. 311. 7. Lactuca, E. Bot. 

 t. 1551. 



Rocks and stones in the sea, very common. 



2. U. Lactuca, Linn. Lettuce green Laver. Frond at first 

 obovate, saccate, inflated, at length cleft down to the base, the 

 segments plane, unequal, laciniate, semi-transparent. Grev. 

 Hook. Br. FL v. ii, p. 311. 



Rocks, &c, in the sea. Substance very delicate, adhering firmly to 

 paper. 



