101 
the sporangium through a narrow opening at ils upper end. After liberation, which 
was observed in July, the spores took an ovoid form, thereafter they became glo- 
bular and then showed amoeboid movements. 
The germinaling spore forms an orbicular basal cell which gives off one up- 
right filament but for the rest remains unaltered for some time (fig. 30 D); later 
on it forms cells in the periphery which grow out in creeping filaments fusing 
together to a rather large-celled basal disc, which produces more upright filaments 
(fig. 31 C). The original basal cell is for some time distinguishable in the centre 
of the disc. As shown by Kyrın, no downwards growing filaments occur al the 
base of the upright filaments. However, N 
I have once observed two short vigorous | 
descending filaments given off very near 
the base of an upright filament, and 
each producing an upright filament on 
its convex side (fig. 31 D). 
The chromatophore, the form of 
which KyYLIN was not able to determine, 
is shown in fig. 30 which was drawn 
after living plants; it is a parietal plate, 
often with a lobed margin and with a 
large pyrenoid which is also parietal but 
much projecting inward in the cell. The 
nucleus often lies at the opposite side of 
the cell from the pyrenoid (fig. 30 B, C). 
Plants similar to those mentioned 
above were found at a locality in the 
Samsø Waters in September. They were, 
however, only provided with ripe cysto- 
carpia and bore no sporangia, perhaps 
to be explained by the sporangia accom- Fig. 30. 
plishing their development faster than an wk 
the cystocarps. sporangia and liberated spores. B, branch with branchlets 
Referring for the rest to, Kyzin’s Betvins aniherkin à eopogonium and sporangia; behind 
description, I may remark finally, that cell with chromatophore, pyrenoid p and nucleus, k. D, 
the filaments in my plants were 7,5— eh 
9,5 y thick, that I have once observed a pair of opposite branches, that the spor- 
angia were 14—16(—17) long, 9—11,, broad, and that the carpospores were 19— 
214 long, 11—12,5(—14)u broad. 
The main form has been found growing on Polysiphonia violacea, Ceramium 
rubrum, Cystoclonium and Dictyosiphon, with sexual organs and ripe carpospores 
and monospores in July, with ripe carpospores in September. 
Localities. Kn: Busserev by Frederikshavn, July. — Sa: MP, Falske Bolsax, 11-13 meters. 
