PLATE I. 



Fig. 1. Prothallus of Sphagnum cuspidatum (after Hofmeister). 

 Fig. 2. Archegonium of Phascum, showing the embryonic cell with 

 its nucleus just after impregnation, magnified (after Hofmeis^elT. 



Fig. 3. Antheridium and garaphyses of Mnium punctatum, magni- 

 fied. The antheridium is ejecting the spermatozoids. 

 Fig. 4. Antheridium of Sphagnum (after Hofmeister). 

 Fig. 5. Perforated leaf-cells of Sphagnum, containing a spiral 

 thread, and surrounded by narrow chlorophyllous cells, magnified. 



Fig. 6. Perforated cells of Leucobryum glaucum, enclosing chloro- 

 phyllous cells. 



Fig. 7. Section of upper part of sporangium of Phascum cuspida- 

 tum, magnified (after Lantzius-Beninga). 

 c. columella. 

 s. spore-sac, 

 a. walls of spore-sac. 

 *. intermediate space. 

 m. inner wall of intermediate space. 

 k. outer wall of intermediate space. 

 w. wall of sporangium. 



Fig. 8. Section of upper part of spOTangjum of Bartramia fontana, 

 magnified (after Lantzius-Beninga) . 



c. columella. 

 *. spore-sac. 



a. outer wall of spore-sac. 



i. intermediate space, traversed with threads. 



m. inner wall of intermediate space. 



k. outer wall of intermediate space. 



I. row of cells continued from m. 



g. row of cells continued from top of intermediate space. 



d. inner peristome, formed from the thickening of the outer 



wall of the cells in I and the inner wall of the cells in g. 

 k. row of cells continued from outer wall of intermediate 

 space. 



b. outer peristome, formed by the thickening of the outer 



wall of the cells in g and of the inner wall of the cells in h. 



