V. MOSSES (MUSCI): SPHAGNALES—ANDRE^ALES \77 



detached. Schimper states that antheridia may l:>e formed at 

 any time, but they are more abundant in the late autumn and 

 winter. 



The archegonia are found at the apex of some of the short 



Fig. 92. — Sphagnum acutifolium. Development of the embryo (after Waldner). A-D, 

 Median optical section; E, F, cross-sections. A, D, E, F, X360; C, X315; D, 

 XiS3. 



branches at the summit of the plant, which externally are indis- 

 tinguishable from the sterile branches. The development of 

 the archegonia has not been followed completely, but to judge 

 from the stages that have been observed and the mature arche- 



12 



