ARCHEGONIUM AND SPOROPHYTE OF TREUBIA INSIGNIS 265 
which have been confirmed for the most part by the writer's own 
observations. 
The archegonia occur in groups, sometimes as many as a dozen 
together. As we have already seen, they are laterally placed, and 
each group is in the axil of one of the dorsal scales, which completely 
covers it. 
The youngest archegonia (fig. 2, A) are hemispherical cells. The 
first division may be a horizontal one, cutting off a short stalk-cell — • 
or it may be strongly oblique. In the latter case the first wall is 
quickly followed by two similar ones, which intersect so that a central 
(terminal) cell is formed which appears triangular in longitudinal 
Fig. 2. A. Two very young archegonia, X 550. B. A somewhat older stage, 
showing the cap-cell, c, X 550- C, D. Older stages, showing four neck canal-cells, 
X 335- 
