Fig. 55. Fern Diseases. 



a. Host cell invaded with resting spores o£ Completoria complens, b. hos^ 

 cell with fungus body of C. complens, central cell forming resting spores, 

 and some of the peripheral ones developing conidia, d. fungus body in host, 

 the peripheral cells of which develop tubes which penetrate adjacent cells 

 of fern prothallium, d. two young plants in one cell of the host, having en- 

 tered from an adjacent cell {a-d after Atkinson). 



