564 
along their longitudinal axis. It is in accordance with this interpretation that the 
ripe monospores seem to contain one single chromatophore (fig. 562 G). 
The nucleus of the monosporangium is 
most frequently found in the resting stage, showing 
a large nucleolus or central body surrounded by 
a well marked hyaline halo but no chromosomes. 
x In other cases the central body was differentiated 
into small grains staining intensely with hæma- 
& <= toxylin. When they were most distinct, the number 
# 
DB 
Pre 
ET 
ES 
EIN 
Sg, 
% 
DAS ~ 
< = VE UZ; of the latter was seen to be four (fig. 561). In a 
Hate ME å a dividing nucleus (fig. 561 42) two groups of such 
IF "00 | 4 grains were to be seen. There can be no doubt 
= 
that these grains were chromosomes. When GRE- 
UP SER Gory (l. c. p. 768) states that “There is some 
re de an evidence that there are eight chromosomes in the 
apical cells and in the monospores of Sterrocolax 
decipiens”, it seems probable that this remark alludes to such dividing stages. The 
nuclear divisions observed were evidently all mitotic, and no indication of a synapsis 
stage or a heterotypic division was ever met with. It must be concluded from my 
investigations that the chromosome number of the (secondary) nemathecial filaments 
and the monospores is 4, and the nuclei of the frond seem to have the same number 
(comp. K. RosENVINGE 1931, p. 19). 
The monospores ripen in winter and are still to be found in May. The ripe 
sporangia are ellipsoid or obovate. The number of chromatophores in the ripe 
sporangia is not easy to observe in fixed and stained material; there is a great 
amount of matter staining with hematoxylin surrounding the nucleus. A further 
fusion of chromatophores perhaps takes place here. After the evacuation of a 
Fig. 559. Fig. 560. 
Ahnfeltia plicata, November (Flemming, Heidenhain). End-cells Same material as fig. 559. Four end- 
of (secondary) nemathecial filaments showing nucleus and chro- cells from the same section showing 
matophores. In F the limitation of the nucleus is indistinct, a nucleus and chromatophores, the latter 
group of ‘4 chromosomes is situated to the right of the central apparently partly fusing together. 
body. 1800: 1. 1800 : 1. 
