Botany. | 277 
vibratile cilia of the attached antherozoides. The latter continue their 
usual m diminished vivacity, for some time after 
nm 
=) 
< 
o 
3 
14) 
=] 
a 
la 
~ 2 
oO 
S 
gg 
ir 
~ 
> 
membrane of cellulose; and on the same or the following day, or 
sometimes later, the first partition appeared, dividing the spore into two 
cells ; one of these began to form a slight protuberance at a point per- 
pendicular to the partition, which soon gp into a hyaline slender 
lament,—a sort of radicle, by which the germinating planilet is 
attached,—while the cell at the opposite onmentts enlarges and divides 
to produce the rudimentary frond. On the other hand, spores under 
t 
antheridia, remain unchanged for several days, and then are decom- 
posed, or else they become: covered with a cellulose coat and then make 
always with the same result, Thuret announces it as an ernie’ 
fact, that the spores of Fucacee are incapable of germinating 
reproducing the species without the concurrence of the antheroznides 
oreover, no ae aa could be produced when the spores o 
Species were mingled with the antherozoides of another of the same or 
alli g the usual reluctance to hybridism ;— 
tra i 
answers that nothing authorises him to think so, as “ey has never found 
any evidence of such penetration ; while in certain species he has proo 
that the spores were fecundated by antherozoides which were arresied 
by a Lssgneaee! external coating produced by the dissolution of the 
epispore or other 
In a second shine this memoir, published in Ann, Sci. Nat., ser. 4, vol. 
iii, No. 1, M. Thuret gives the result of his continued observations upon 
the fructification of the Florideous Alge. n these, the antheridia, 
(which were first discovered by Ellis in 1757), have now been detected 
in the greater part of the species of all the principal groups; but t 
Contained corpuscles ee to the active antherozoides of the Fuca- 
cé@, are not found to e hibit movement, nOF 16 Oe furnished 
these plants. Their general occurrence, and their position and struc- 
tu 
u 
18 not known by observation, Thu ascertained that the spores 
may and often do geroiee azenee any get with the corpuscles. 
Bi later in we ven by sesh i Ann. 
