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Treub . — Some words on 
alone, will prove to be rather a preliminary sifting than a 
natural classification. 
At the present time we know three types of Lycopod- 
prothalli; i, the annotinum- type, not sufficiently known ; 2, 
the cernuum- type ; 3, the P hlegmaria-ty^e. 
In four species of Lycopodium , which have not been hitherto 
studied, I can now give a brief account of the prothalli ; three 
of them belong to the Phlegmaria-type, and the fourth to the 
cernuum-type. 
The prothallus of Lycopodium carinatum , Desv., is exactly 
like that of L,. Phlegmaria. Although I have been able to 
study a great number of prothalli of Z. carinatum, I have not 
found any important difference between the sexual generations 
of these two species. As far as I have seen, the development 
of the embryo in L. carinatum is quite similar to what I found 
in Z. Phlegmaria. 
Of the species Z. Hippuris , Desv., and Z. nummularioefolium , 
Blume, I have only had the opportunity of studying a few 
prothalli, because they are exceedingly difficult to get, though 
for different reasons. The prothalli of L. Hippuris seem to be 
very rare, at least in the western part of Java. Only three or 
four times have I found parts of a prothallus in connection 
with a young plant. They proved to be of the Phlegmaria- 
type, but they are much larger and thicker than those of 
Z. Phlegmaria. Regarding the asexual generation, it may 
be worth while to notice that the suspensor seems to be 
generally very large. 
In the case of Z. nummrdarioefolium the difficulty in finding 
prothalli has another cause. I do not think the prothalli of 
this species are very rare ; but they are so thin that they can 
scarcely be detected upon their substratum, the dead layers of 
the bark of trees. Still there is no doubt they belong to the 
Phlegmaria-type. I have succeeded in raising from the 
spores, in the Buitenzorg laboratory, the prothalli of a form of 
Lycopod, nearly allied to Z. cernuum , L., and to Z. densum , 
Labill. Certainly the plant is not a variety of Z. cernuum ; it 
may be that it belongs to Z. densum \ but I incline to consider 
