ConferveaP^ cladophora. 315 



The best specimens for the herbarium are got on Zostera 

 manna. See a fine figure of it in ^Phycologia Britannica/ 

 Plate Yi. 



5. Cladophoea aecta, Kiltzmg. (Plate XYII. fig. ^Q, 

 tufts^ of the natural size; and on the left a portion of a- 

 filament magnified.) 



Hab. On rocks from half- tide level to low-water mark. 

 It is questioned whether it is perennial ; I am disposed to 

 tliink that it is annual. It is very abundant in spring and 

 summer, and the young plants, on account of their lively 

 green, and the fine silky, silvery gloss towards their tips, 

 are exceedingly attractive. So early as the 5th of March 

 in 1849, I gathered beautiful tufts of it at Ardrossan. 

 "Wlien dried in this young state it adheres well to paper, 

 and long retains its glistering appearance at the tips ; 

 whereas, when more advanced, it loses its fine colour at the 

 base, and soon ceases to glister in the herbarium. By the 

 end of summer it is seldom seen, and, when found, is so 

 coarse and faded that few would tliink of retainiue it. C. 

 arcta is now understood to include C. VauchencEformis as 

 its young, and C. centralis as its old state. Substance, when 

 young, tender and flaccid ; when old it does not adhere 

 well. See good figures of it, older and younger, in Phyc. 

 Brit. PL cxxxv. 



