TRANSLATION. 
IAKTTAGELSER dfver den HvVILANDE CiDOGONIUM-SPORENS 
UTVECKLING. (OBSERVATIONS on the DevELopMENT of the 
Restine-spores of GipoconiuM.) 
gE Ofversigt af Kongl. Vetenskaps-Akademiens Forhandlingar,’ Stockholm, 
1863, p. 247, Tab. II.) 
TuroucH Pringsheim’s distinguished researches on the 
mode of propagation in the lower Algse, it is now known that, 
besides the still longer-known propagation by means of motile 
gonidia or zoospores, there exists a mode of reproduction by 
means of spores, which are formed by the co-operation of a 
male and female organ. The development of these spores, 
which in their mode of origin correspond to the seeds of the 
higher plants, has been observed in many cases ; but the mode 
whereby new plants proceed from these has not yet been fol- 
lowed out in several groups of Algze. The genus Gidogonium, 
rich in species, belong to these latter Algze. It has been long 
known that certain cells of the Gidogonium-filaments were 
distinguished from the remaining cells by their egg-shaped 
figure, and by their densely crowded contents, surrounded by 
a cell-membrane ; but Pringsheim was the first who succeeded 
in giving a satisfactory explanation of their significancy. 
Pringsheim found, namely, that the round bodies enclosed in 
the inflated cells are spores, which are formed through the 
fertilising influence of a male organ. With the greatest ac- 
curacy Pringsheim has observed and described the mode of 
formation of these spores, but not how they become developed 
into new plants. Im order, then, to become perfectly ac- 
quainted with the mode of reproduction of the Cidogonia, 
knowledge as to the further development of these spores is 
wanting; and I hope, therefore, that the following descrip- 
tion of the germination of the spores of a species of Cido- 
