PLATE 56 



Fig. 1. A piece of wood removed from the surface of an TJmbellularia log, 

 showing a number of very small sporophores in the earliest stage of development. 

 Surface and side views, 2% diameters. 



Fig. 2. Shapes assumed by very young undifferentiated fruit bodies. 2% 

 diameters. 



Fig. 3. A group of young fruit bodies in position upon a piece of Umbel- 

 lularia bark. Five of the specimens are in the "apical cavity" stage, one is 

 still undifferentiated, and another (at the extreme right) has already developed 

 lamellar plates. 3% diameters. 



Fig. 4. Tangential section of Acacia wood to show the mycelium of Sohizo- 

 pjiyllum commune in a duct. About 125 diameters. 



Fig. 5. Eadial section of Umiellularia wood to show the hyphae of SeMzo- 

 pJiyllum in the ducts. About 125 diameters. 



Fig. 6. Splitting of the palisade layer previous to the formation of a 

 lamellar ridge. 250 diameters. 



Fig. 7. Outward growth of the palisade layer at the sides of a split. 250 

 diameters. 



Fig. 8. Loosening and outward growth of the elements of the palisade 

 layer to form a lamellar ridge. 250 diameters. 



Fig. 9. Cross-section of the palisade layer to show a very early stage in 

 the origin of a lamellar ridge. 250 diameters. 



[488]„ 



