3S0 



THE BASIDIOMYCETES 



at the base of deciduous trees, especially oaks, produces large, 

 fused, imbricated shelves that are conspicuous because of their 

 bright sulphur-yellow to orange color. Poly poms cinnabariniis 

 has bright, cinnabar-colored brackets, especially on decaying oak 

 branches. Polyponis sclnveinitzii is a common cause of butt rot 

 of overmature coniferous trees. 



Fig. 134. Daedalea confragosa on birch. • 



Considerable interest has always centered around the polypores 

 that produce giant sclerotia. The best known among them are 

 P. sapiirema from Brazil and P. mylittiae from Australia. The 

 Australian species may attain a weight of 30 to 40 or more lb. 

 On the roots of various trees, especially pines, in the southeastern 

 United States occur sclerotia that may attain a weight of over 

 20 lb. The polypore responsible, according to Wolf (1922) and 

 Weber (1929), is Poria eocos. 



The Genus Fomes includes perennial punky to woody poly- 

 pores. A new layer of pores is formed each year over that of 

 the preceding year. Among the smaller species is F. ohioejise, 

 with ungulate conchs about 1 cm in diameter; F. applanatus may 



