SCLEROTIUM COFFEICOLA 449 



soria formed on the under side of leaves are usually smaller than 



Fig. 228. — Sclerotium coffeicola. Upper side of pieces of leaves of Goffea excelsa 

 with about thirty gemmae lying on the epidermis. Several of the gemmae 

 have germinated and have penetrated into the leaf-tissue. The appres- 

 sorium of some of the gemmae can just be seen. Photographed by G. 

 Stahel. Natural size. 



those on the upper side. Each appressorium becomes firmly 

 attached to the cuticle by means of mucilage. In the middle of the 



VOL. VI. 



2q 



