134 
tubulo’sa, 
seta’cea, 
CRYPTOGAMIA. ALGAE. Conferva. (6) Threads 
| jointed. 
Of a fine scarlet when fresh. Fractifications in whirls at 
the ends of the joints. Exi1s. Slippery, very tender, whitish, © 
or fine red ; always dividing and subdividing into forks; al- 
most vanishes in the attempt to dry it. Diix. Consists of 
many branches, equal in size, and breaking into sub-divisions, 
somtimes 5 or 6 inches high. When young it is composed of 
very pale green transparent fibres ; as it approaches towards 
maturity the septa appear more distinct, the joints become more 
_ rounded, and replete with a scarlet liquor which in a short time 
La 
oozes through the tender skin, byt it shews its joints very dis. 
tinctly even after the discharge of this liquor. A very singu- 
lar instance of irritability appeared in this plant upon immersing 
it when quite fresh, into fresh water. After it had been in the 
water a few minutes, several fibres were observed to move in an 
horizontal direction with a quick convulsive twitch, then to 
stop suddenly, ‘This they continued to do for some length of 
time, I repeated this experiment several times, and the same 
effect was produced, provided the plant was fresh, At first I 
attributed it to a separation of air from between the joints of 
the Conferva, but this ought to have been seen when rising up 
to the surface of the water. I tried the experiment in salt 
water, but did not observe the same effect. Major Vexiey. — 
Conferva geniculata. ENlis ib. p. 425. Stones and rocks in 
the sea, On stones at Cockbush, on the Sussex coast, and on 
the Isle of Inys y much, near Bangor. Ditt.—Near Bright- 
helmstone, Sussex, Exxis.x—[Very frequent near Weymouth. 
Mr. Sracxuouse. } ee A May—Oct. 
C, Thread-shaped, jointed ; joints alternately com- 
_ pressed: Linn. Very much branched; joints 
oval, Huns. 
: Dill. 6. 39, 
__ From 2 to 4 inches long, irregularly divided and sub-di- 
vided into branches, yellowish green. Branches knotted or 
jointed, hollow, fi1tu. 34, 
Conferva tubulosa. Huds. 600, Ulva confervoides. LINNe 
In Gmelin’s Syst, veg. it is ente b ight, both as 4 
Conferva and as an Ulva. ted, by oversight, bot 
_ Rocks and stones in the sea ; and on Fuci, A, Summer. 
C, Threads forked: branches very long, bristle-shaped: 
joints cylindrical, Huns. 599. 
aes Dill, 6, 374 Cael 
incertae tee we Dieta adi wrist divided, divisions 
€ss frequent, but I have never observed it entire. 
lour reddish purple, or greenish red, Ditt. 
