74 



INTRODUCTIOJS TO CllYPTOGAMIC BOTAMY. 



duced in damp places, under certain chemical conditions, 

 which gradually becomes organised, and then contains 



Fig. 18. 



a. Sporidesmium Lepraria, Berk., magnified from a siiecimen com- 

 municated by Mr. Borrer. 



h. Cladonia cornucopioides, Scliaer. Moiig. No. 752, nat. size, 

 c. Roccella fuciformis, D. C. var. from Valparaiso, nat. size. 



granules, -which, according to the predominance of certain 

 phenomena of temperature, light, electricity, &c., give rise 

 indifferently to AlgEe, Fungi, or Lichens, there would be 



