F. Cavers. 
16 
Fig. 67. Longitudinal section of a nearly ripe sporogonium of S. compaction. 
At the top is the withered neck of the archegonium, the lower part (calyptra) 
of which covers the nearly spherical capsule. The capsule-wall shows the 
groove which separates off the lid. The dome-like spore-sac (spores only 
shown on left side), and the central tissue (columella) are seen. The capsule 
is connected by a constriction with the absorbing foot. Elongation of the 
pseudopodium has not yet taken place. 
