172 SYNOPSIS OF BKITISH SEAWEEDS. 



Bilky; bui as it progresses, the brighl colour is more and 

 more confined to the top branches, and the lower pari of 



the frond becomes coarse and woolly. 



308. glaucescens {The glaucous Cladophora) ; tufts dense, 

 glaucous -green, sub&stigiate j filaments very slender, ile\- 

 uous, excessively branched j branches rather straight, erect 

 or erecto-patent, the Lesser ones furnished with close, very 

 erect, straight, elongated ramuli •. articulations nearly uni- 

 form, about thrice as long as broad, Ifarv. Bhy. Br. pi. 196. 

 (Atlas, PL LXYI. Fig. 311.) 



Conferva glaucescens, Griff. 



Hub. On rocks and stones, between tide-marks. Annual. Sum- 

 mer. 

 It is difficult to say to which of the British species of 

 Cladophora this species is most closely allied. At one 

 time I regarded it as belonging to the same group as C. 

 arcta, and even thought that it might prove to be merely 

 a state of that species ; but a more careful examination and 

 comparison show a greater affinity with C. alb/da or C. 

 refracta, from either of which however it is readily known 

 by a difference in ramification. Its glaucous colour when 

 fresh, the slenderness of the filaments, and the uniform 

 length of the articulations in all parts of the stem, are 

 characters by which it may most easily be known. 



309. falcata ( The hooked Cladophora) ; densely tufted, dark- 

 green ; filaments intricate at the base, ultra-capillary, rigid, 

 much curved, irregularly branched ; branches zigzag, re- 

 peatedly divided, the lesser divisions arched, or strongly in- 

 curved and falcate, furnished along then* inner faces with 

 short, secund, blunt ramuli ; articulations three or four 

 times longer than broad, with a dense endochrome and pel- 

 lucid dissepiments, JIarv. Phyc. Brit. pi. 216. (Atlas, 

 PI. LX1X. Fig. 325.) 



Hab. The bottoms of clear rock-pools, near low-water mark. 

 Annual. Summer. 

 I gathered a few specimens of the Cladophora here de- 

 scribed in the summer of 1845, in some deep rock-pools, 

 near low-water mark, under a steep mural cliff outside 

 Dingle Harbour, Kerry, in a situation where the fronds 

 were constantly in shade. More recently I have received 

 from Miss White specimens collected at Jersey, which 

 agree in most characters with the west-of-Ireland plant, 

 but are not exactly true to the type. Beautiful, and appa- 



