302 
most of which are smaller and become the antheridia. An axile cell as those figured 
by Näcerı (1. c. fig. 28) may be present, but only in the under part of the anthe- 
ridial cluster. The upper segments divide by anticlinal walls in a number of cells, 
meeting almost in the axis of the segment and producing 
at the periphery a number of smaller cells, the an- 
theridia (fig. 209). The stalk-cell, which usually con- 
tains a number of nuclei, produces also by peripheral 
divisions a number of unicellular antheridia-produ- 
cing cells (SvEDELIUS “Spermatangienmutterzellen”’). 
The procarps are situated at the end of short 
branches, The apical cell of such a branch produces 
by two transverse divisions two short segments, the 
uppermost of which undergoes further divisions, 
giving rise to the procarp, while the undermost and 
the apical cell remain undivided. By the first of these 
divisions the upper cell receives only one nucleus 
while the segment cell, becoming the stalk cell, con- 
tains several nuclei (fig. 210 to the left). Only rarely 
is the stalk cell also uninucleated (fig. 211 A). By di- 
vision of the uninucleated apical cells two cells, each 
containing one nucleus only, result, the undermost of 
Fig. 209 which is the mother-cell of the procarp. 
ne The development of the procarp has been des- 
ridial body. A 63:1. C 350:1. B, D560:1. cribed by NÄGELI (1861), PRINGSHEIM (1862), BORNET 
and THURET (1876), JaNczEwskr (1877) and recently 
more thoroughly by Kyrın (1923 p. 53—55), to whose description we may here 
refer. As shown by this author, the cell next to the top divides by longitudinal 
walls in a central cell and three pericentral ones the 
middlemost of which does not divide further. One of 
the lateral cells gives rise to a peripheral sterile cell 
(figs. 211 B,C, G,I') and to the carpogonial branch which 
becomes opposite to the median pericentral cell. The 
undermost cell-wall of the carpogonial branch is often 
oblique (fig. B, E, comp. JANCZEWSKI p. 115), the under- 
most cell being nearer to the lateral cell from which 
the carpogonial branch is given off. All the cells of 
Fig. 210. 
the procarp are uninucleated from the first. The nucleus Spermothamnion repens. Young procarps 
bearing branches showing the first di- 
RE. DE EU ae =. : : i 
of the young carpogonium divides into two, the upper En Cia, 
of which enters into the trichogyne where it appears 
as a rather hyaline body with a distinct nucleolus (figs. D, E). As shown by KyLin, 
two small sporogenous cells are cut off from the fertilised carpogonium and these 
cells fuse with the two auxiliary cells which are cut off from the two lateral peri- 
