25 : 
definite boundary, offers a solid resistance to their further penetration 
into the sporangium. 1e corpuscles continue thus to struggle 
forward into the cutaneous layer for more than_half-an-hour; 
unding against its outer surface they retreat, again push for ; 
again retreat, and so on, in an uninterrupted succession of assaults 
and retreats. 
corpuscles are separated f 
u 
Even after the lapse of several hours the dead corpuscles may be seen 
in the rostrum, lying on the front of the sporangium, until at last they 
are completely dissolved, and all vestige disappears. 
“The cu 
sporangium becomes transformed, after impregnation, into the coat 
of the true spore, which, thus formed, represents a large cell 
the persistent tunic, which is open in front and prolonged into the 
Tostrum. — ; ; 
time, say three months, the spore suddenly resumes its green colour, 
and immediately thereupon grows into a young Vaucheria exactly 
l 
v. Seminata, (Vauch.) Walz. Dark or dull green, in dense 
intricate tufts; thallus capillary, tough, dichotomous. Oogonia 2 
Fancy 1 or 3), ovate or obovate, opposite, distinctly pedunculate. 
ntheridia intermediate, subulate, more or less recurved. Mature 
“spore spotted with brown, sporoderm colourless, composed of three . 
nay porangia on the same or a proper thallus, broadly cup- 
: oe truncate, and angularly horned. Size: Oospore, ‘11-12 x 
"19 mm, 
Dr, Cooke records that J. P. Vaucher says “ that this species (in 
Pe) is one of the most common, and is found in nearly all ditches, 
