303 
central cells; one of these sporogenous cells is seen in fig. F. The cells of the 
carpogonial branch were often found fused together after fertilisation, most frequently 
so that they all took 
part in the fusion 
(figs. F, G). The in- 
terpretation of the 
case represented in 
fig. I? is somewhat 
uncertain. À fusion 
cell is seen under 
the carpogonium 
and on either side 
of the fusion cell a 
small cell has been 
cut off. It has the 
appearance that the 
sporogenous cells 
have been cut off 
not from the ferti- 
lized carpogonium Fig. 211. 
but from the upper Spermothamnion repens. Development of procarps. A, young procarp-bearing filament; 
il 1] f tl the stalk-cell is uninucleated. B, the carpogonial branch is formed; its first cell is 
sterile ce 0 1e partly hidden behind the second one. C, procarp seen from the dorsal side; D, E, lateral 
carpogonial branch. view; the trichogyne nucleus is visible. F—K after fertilisation. F, a sporogenous cell 
is visible. G, the cells of the carpogonial branch fused together; young gonimoblasts. 
2 
It seems however I procarp seen from the ventral side, I! at a lower, I? at a higher level of the same 
that this case must procarp. The pericentral cell to the left has produced a sterile cell and an auxiliary 
ie merne cell, for the rest see text. K, lateral view; the auxiliary cell in beginning division. 
DS UD BG EUINANE D, E 455:1, the other 284:1. 
other way. The cell 
situated to the left of the carpogonial branch in fig. I? is evidently the first cell of 
this branch, being attached to the pericentral cell to the left in fig. J’. The fusion 
cell has undoubtedly arisen by fusion of three cells. The upper of 
these cells must have been the carpogonium or more exactly a part 
ofthe carpogonium, undoubtedly containing the sporogenous nucleus, 
while the small cell situated over the fusion cell must be the rest 
of the carpogonium, probably without any nucleus. If this inter- 
pretation is true, the two small lateral cells must be true sporo- 
genous cells, on the way to fusion with the auxiliary cells just cut 
Spermolhamnion re- x ni 5 BUR 
Poe | Olt from) une peripheral cells (comp. fig. I). i ns 
350 : 1. The upper sterile cell in the procarps may sometimes divide 
and grow out in a sterile filament. JANCZEWSKI (I. c. p. 117) found 
it sometimes replaced by a cluster of antheridia. The statement of PRINGSHEIM (1. c. 
p- 19) that it may sometimes develop into a “Sporenmutterzelle’ (carpospore), is 
certainly erroneus. I once observed two procarpia situated one over the other, ori- 
39* 
