DEVELOPMENT OF PLANTS 



233 



B. Clauariaceae or Coral Fungi. This family includes the fairy 

 clubs and coral-like fleshy masses of various colors (Fig. 169, C). 

 The hymenium covers the branches. 



C. Hydnaceae or Prickly Fungi. These fungi form masses of 

 widely various forms, but provided with spine-like outgrowths 

 upon which the hymenium is developed (Fig. 169, D). 



D. Polyporaceae or Pore Fungi. This group includes largely 

 leathery, woody or corky fungi in which the hymenium is de- 

 veloped on the surface of pores. They contain some of the most 



FIG. 170. Pore forms of the Agaricales : A, Boletus, showing fleshy 

 pore-bearing layer, p. B, top view of a woody, bracket form, Elfvingia. 

 The concentric lines represent the annual growth. C, section of a similar 

 form, showing three layers of pores that represent three years' growth. 

 D, enlarged view of under surface, showing one of the pores with hy- 

 menial layer. 



destructive of the timber-destroying fungi. Many of the genera 

 of this family form shelf-like outgrowths on trees and are there- 

 fore known as bracket fungi (Fig. 170, B-D). 



E. Boletaceae or Fleshy Pore Fungi. The members of this 

 family are generally characterized by a stalk and a pileus which 

 bears pores, the latter being easily separable as a layer from the 

 pileus (Fig. 170, A). 



F. Agaricaceae or Gill Fungi. These fungi more commonly 

 assume an umbrella form, although some of them are of the 

 shelving bracket type (Fig. 167). The hymenium is arranged 

 on the surface of gills or plates. Many of them are highly 





