416 THE FUNGI WHICH CAUSE PLANT DISEASE 



On living trunks of Tsuga, Pseudotsuga"" and Abies in north- 

 western North America. 



Steccherinum S. F. Gray (p. 414) 



Perennial, pileate, sulcate, zonate, radiately subrugose; teeth 

 wide, irregular. 



S. ballouii Banker is the single economic species. 



Campanulate to subdimidiate, more or less intricate, sessile, 

 decurrent to pendent, 1-4 x 1-5 cm. laterally connate up to 10 cm. ; 

 surface velutinous when yoimg, often licheniferous at base, dark 

 olive-brown, drying gray-brown in older parts and seal-brown 

 in younger; margin obtuse, seal brown; substance thin, 1-2 mm., 

 of two layers, the upper harder, somewhat brittle, dark brown, 

 lower softer and lighter colored; h3nnenium colliculose, golden- 

 yellow, fading to buff or cream; teeth variable, subterete to diform, 

 confluent, papalloid to elongate, usually obtuse, tips brownish, 

 1-5 X 0.6-1 mm. insularly distributed; spores hyaline broadly 

 elliptic to subglobose, 7-7.2 x 5.5-6.5 /i. 



On Chamsecyparis in New Jersey.^* According to Ballou" 

 this fungus is devastating the forests of swamp cedar in New Jersey. 

 As it grows only in the tops of the tree and dies with the host, the 

 dead sporophores soon disappearing, it is a species not easily 

 observed. 



Polyporaceae (402) 



Sporophore annual or perennial; context fleshy, tough, corky 

 or woody; hymenium poroid or lamelloid, fleshy to woody, rarely 

 gelatinous. 



The sporophores are sometimes fleshy, even edible but they are 

 more commonly hard and woody, occurring as bracket forms. 

 Fig. 310, on tree trunks. 



Key to Genera of Polyporaceae 



Pores reduced to shallow pits separated by 



narrow ridges, folds or reticulations. . . I. Merulieae, p. 418. 

 Pores well developed, variable in size and 



form II. Polyporea. 



Spirophore, at least in part gelatinous 



