PLATE 55 



Fig. 1. Longitiuliiial inediaii section through a young fruit body which is 

 Ijractically undifferentiated. There is a region near the apex which stains 

 more deeply and is the seat of later developments. 25 diameters. 



Fig. 2. Similar to fig. 1, but a later stage, showing the first appearance 

 of the apical cavity. 25 diameters. 



Fig. 3. The apical cavity is still further developed. 25 diameters. 



Fig. 4. Beginning of the palisade layer. 25 diameters. 



Fig. 5. Further development of the palisade layer. 25 diameters. 



Fig. C. Maximum growth of the palisade layer in a plane surface. 25 diam- 

 eters. 



Fig. 7. The palisade layer (hymenium priniordiuni) produced into a eon- 

 cave surface by the outward growth of the edges Of the pileus. 25 diameters. 



Fig. 8. Median longitudinal section through a small sporophore formed 

 upon the cut end of a stipe. 18 diameters. 



[483] 



