1899] DEVELOPMENT OF CRYPTOMITRKIUM 119 
and both it and the cell walls, which become very gelatinous, 
stain deeply (a, 6, fig. 6). These gelatinous walls soon dissolve, 
so that the archesporial cells. are set free. Two sorts of cells 
can easily be made out at this time. The one, the spore 
fo 
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heb Ew, 
tion of me Embryo. eed longitudinal section of half-grown embryo. X 300. 4, por- 
dit owe Section showing capsule wall and archesporial cells. X 480. % 
al section of 
a nearly mature sporogonium, showing spore-mother-cells and 
*@ operculum. X 150. d, young elater. X 600. @ spore-mother-cells. 
. 
x Young elaters 
: cells, are almost spherical. Their nuclei are large and — 
(¢, fg. 6), and are surrounded by closely reticulated 
| The other, the young elater cells (d, fig. 6), are 
Their nuclei, though quite distinct, are much smaller 
of the Spore-mother-cells. 
. 
