182 SYNOPSIS OF BRITISH SEAWEEDS. 



Herbarium. While the external habit is peculiar, the 



• characters are very similar to those of ./.'. 

 clatkrata, /•.'. erecta, and E. ramulosa. Dr. Greville lays 

 Btress on tlio rigidity of Bubstance, which is very ob- 

 servable in the dry state at least. The branches i 

 larger diameter than is common in E. clatkrata, but this 

 is a character of little moment in this genus, and the very 

 pale colour may arise from the peculiar circumstance under 

 which the plant grew ; as, if the specimens were collected 

 in a shallow pool near high-water mark, they would as- 

 sured"- be pale. In such circumstances, any species of the 

 genus would be equally bleached. 



334. erecta (The erect Enteromorjpha) ; frond cylindrical, fili- 

 form, slender; brandies erect, opposite or alternate, all atte- 

 nuated to a fine point ; ramuli capillary, erecto-patent ; reti- 

 culations rectangular, nearly square, arranged in many lon- 

 gitudinal lines, Eook.Br.Fl.v. 2. ^.314. (Atlas, PI. LXXI. 

 Fig. 332.) 



Enteroniorpha clathrata, var., Grev. Scytosiphon erectus, Lyngb. 



Fistularia erecta, Grev. Solenia clathrata, var., Ag. 

 Hab. On rocks in the sea, and in rocky submarine pools, at about 



half-tide level ; also dredged in 4-6 fathoms water. Annual. 



Spring and summer. Not uncommon. 

 I have cautiously confined myself, in making the above 

 description, to the typical variety of this variable plant, a 

 specimen of which, communicated by Mrs. Griffiths, is re- 

 presented in the Plate. In the ' Manual ' I have recorded 

 my agreement in opinion with Dr. Greville, Sir W. Hooker, 

 and indeed with the majority of botanists, that the several 

 forms called E. erecta, E. clathrata, and E. raihulosa, are 

 but different states of one species ; and may now add that 

 E. Linhiana, of Greville, and E. Uopkirkii, M'Calla, are 

 in my judgment equally doubtful. E. erecta is one of the 

 most beautiful forms, particularly when dredged in deeper 

 water than comes within the usual tide-range. 



335. clathrata {The latticed Enter ornorpha); frond cylindrical, 



filiform, slender, highly reticulated ; branches spreading, 

 much divided, set with divaricated or recurved, slender, spine- 

 like ramuli, Grev. Alg. Brit. p. 181 (in part). (ATLAS, 

 PL LXXI. Fig. 333.) 

 Solenia clathrata, Ag. Scytosiphon clathratus, Lyngb. S. para- 

 doxus, Fl. Dan. Ulva clathrata, Ag. Conferva clathrata, 

 Roth. C. paradoxa, Dillw. 



