ConreRva intricata, Grev! Fl. Edin. p. 815. 
Baneta Johnstoni, Grev! in Johnst. Fl. Berw. p. 260. 
Baneta viridis, Fl. Dan. t. 1601. f. 1. (see. Lyngd.) 
Has. On marine rocks, and attached to Alge. Bantry Bay, Wiss Hutchins. 
Berwick, Dr. Johnson. Frith of Forth, Dr. Greville. Torquay, Mrs. 
Grifithis. Malbay, W.H.H. Not uncommon. 
GeroGR. Distr. Shores of Europe. Feeroe Islands. 
Descr. Filaments about two thirds the thickness of those of C. tortuosa, forming 
densely interwoven strata, or tufts among the branches of other Algee. Joints 
even in the same thread varying from a little shorter than their breadth, to 
about once and a half as long. Colour a dark grass green. 
eee 
IT am now of opinion that the plant called C. wlothriv in the 
British Flora, whether the species intended by Lyngbye or not— 
a pomt which I do not determine—cannot be kept separate from 
C. impleva. his species was first noticed by the late Miss 
Hutchins, at Bantry, and is probably widely dispersed. 
B. Fig. 1. ConreRVA IMPLEXA :—vatural size. 2. some of the threads mag- 
nified. 
Pruate LIV. C. 
CONFERVA ARENOSA, Carm. 
Conrerva arenosa; filaments slender, straightish, rigid, forming broad 
strata; articulations fron three to five times longer than broad. 
ConFERVA arenosa, Carm. Aly. ‘Appin. ined. Harv. in Hook. Br. Fl. vol. ii. 
p- 353. Harv. in Mack. Fl. Hib. part. 3. p. 226. Harv. Man. p. 130. 
Has. On the sandy sea-shore, at half-tide level. Appin, Capt. Carmichael. 
Bantry Bay. Ir. R. Balt. 
Grocer. Distr. Scotland. Ireland. 
Descr. “This species,” says Capt. Carmichael, “ occurs in fleeces a yard or 
more in extent, and of a peculiar structure. They consist of several ex- 
ceedingly thin layers, placed over each other, but so slightly connected that 
they may be separated like folds of gauze, to the extent of many inches, 
without the least laceration. Filaments 5 or 6 inches long, about the thick- 
ness of C. bombycina, rigid, possessed of a peculiar roughness; feeling, 
when pulled asunder, as if hair were drawn over a piece of rosin. Articula- 
tions 8-5 times as long as broad; sporular mass assuming a great variety 
of forms. When old, the filaments become exceedingly rough, and often 
tubercular.” —Alg. Appin. ined. 
The great length of the joints readily distinguishes this species 
from any other British Marme Conferva. 
It may be well to observe that the three species here repre- 
sented are drawn to the same scale. 
C. Fig. 1. CoNPERVA ARENOSA :—xatural size. 2, Some of the filaments mag- 
nified. 
