498 Farmer. — On Spore- Formation and 
rapidly formed. The cytoplasmic radiations from the centro- 
spheres entirely disappear, and with them the possibility of 
distinguishing either centrosphere or centrosome. The con- 
necting fibres, however, persist for a short time, until the 
spore is completely divided by a cell-wall. 
The most noticeable feature of the daughter-nucleus is the 
extreme clearness with which the stages by which it passes 
into the resting condition are shown. Very shortly after the 
appearance of the nuclear wall, the nucleoli are formed 
within it, and they are exactly similar to the small bodies 
already alluded to which are discoverable about the connect- 
ing fibres at this stage. They are at first small, and often 
two or three in number, and they exhibit the same relation to 
the linin framework as has been already described in the 
earlier phases of division. At first they are vacuolated, and 
this condition persists for a while after their fusion into 
a single large one, but gradually this appearance is lost, and 
pari passu the linin loses its chromatic constituent, or at 
any rate it is no longer distinguishable. The threads of linin 
now become excessively fine, but they are still quite clear 
within the nucleus, and they are stained brown, like the 
cytoplasm, by Gentian Violet and Orange G., whereas the 
nucleolus absorbs the Gentian Violet just as the chromosomes 
did when still rich in chromatin. 
Nuclear Division in the Sporophyte. 
I observed several cases of karyokinesis in the sporophyte 
of this plant, including cells of the archesporium and also of 
the wall of the capsule. I did not investigate them minutely 
beyond assuring myself that in both tissues there were sixteen 
chromosomes in each nucleus instead of eight, as in the 
gametophytic nuclei. 
Plagiochasma, Itiella, Marehantia, Eimbriaria. 
Plagiochasma , in the general character of its spore-forma- 
tion, recalls that of Fegatella, but it differs from it in possessing 
a spherical spore- mother-cell instead of a flattened one. The 
