THE FUNGI WHICH CAUSE PLANT DISEASE 415 



50-80 cm. long, creamy white in color, texture at first fleshy, be- 

 coming more fibrous; pileus often 3 cm. thick, upper surface al- 

 most plain, slightly scaly, all pilei united behind, teeth slender, 

 often 12 mm. long. 



On sugar maple, beech, etc., causing rot of the heart-wood. 



H. diversidens Fr. causes white rot of oak and beech in Europe. 



H. schiedermayeri Heuff,^* injures apple trees in Europe. 



Irpex Fries (p. 414) 



Sporophore shelving or resupinate, hymenium on the lower side, 

 from the first toothed; teeth firm, subcoriaceous, acute, continuous 



Fig. 299. — I. flavus. H, habit sketch. After Henninga. 



with the pileus, arranged in rows or reticulately, basally widened 

 and lamellate or even fa void; basidia 4-spored. 



I. fusco-violaceus (Schrad) Fr.^' is a wound parasite on pine in 

 Europe. 



I. flavus Klotsch is injurious to the Para rubber, cloves and 

 coffee; I. destruens to tea. 



I. paradoxus (Schrad) Fr., according to Glazan,™ causes timber 

 rot. 



Echinodontium Ellis & Everhart (p. 414) 



Similar to Hydnum but differing in perennial habit; pileus, 

 smooth, woody; cystidia bearing spines. 



E. tinctorium E. & E.''' ''* is the only species. 



Spines brown, 1 cm. long, 1^4-2 mm. broad; cystidia subconic, 

 reddish-brown, 20-30 x 6-7 m- 



