ION 



THE AMERICAN NATURALIST [Vol. XLII 



the "conidia" described by Jeffrey in Botrychium, but 

 do not show the thick walls of these conidia. Like these 

 conidia of Botrychium they are not, usually at least, 

 separated from the filament by a septum. The young 

 cells of the gametophyte contain starch in the form of 

 rather small and very distinct granules. As the endo- 

 phyte invades these cells, the starch granules soon show 

 evidences of disintegration, swelling up and losing their 

 sharp contour and finally becoming aggregated in irregu- 

 lar masses of considerable size (Fig. 1, A, st). These 

 finally are more or less completely digested by the 

 fungus, but the nucleus of the host cell is in no way 

 affected, and even where the cell is completely filled with 

 the crowded hyphae, the nucleus remains quite normal 

 in appearance. 



The endophyte of Botrychium virginianum (Fig. 2) 

 closely resembles that of Ophioglossum, but is somewhat 

 smaller in all its parts and occupies the whole central 

 region of the massive gametophyte. The two sorts of 



