EXPLANATIONS AND REFERENCES, 

 PLATE CVI. 



PAGE. 

 Fig. 1-6. GONGROSIRA, a psewe/o-germs, . . . . 1: 



Figs. 2, 3. GONGROSIRA SCLEROCOCCUS, . 1 20 



" 7,8. PROTONEMA, a prothallus of moss, . 120 



"10. " " of fern, 120 



