Ill 



THE JUNGERMANNIALES 



79 



level of the thallus, instead of penetrating into it, as is usually 

 the case. The stalk or portion between the capsule and foot 

 remains short, and in longitudinal section shows about four 



FIG. T,2.Sphccrocarpus sp (?). A, B, Median longitudinal sections of the arche- 

 gonium venter, with enclosed embryos, Xa6o; C, an older sporogonium in median 

 section, X26o; D, a still later stage, showing the large space between the arche- 

 sporial cells and the wall, X8s. 



rows of cells. As the calyptra grows the upper part becomes 

 divided into two layers, the part surrounding the foot into 

 three. Instead of breaking through the calyptra at maturity, 



