460 



THE FUNGI WHICH CAUSE PLA^ff DISEASE 



Fig. 329.— CoUybia velutipes. After 

 Lloyd. 



A common saprophyte which is reported by Stewart ^"^ as the 

 probable cause of death of the horse-chestnut. It has also 



been reported in Europe as a 

 parasite. 



Tricholoma Fries (p. 450) 



Stout and fleshy, stipe 

 rnd pileus of the same sub- 

 stance; gills sinuate or ad- 

 aate. Fig. 330. 



T. rutilans Scha. occurs on 

 pine roots; T. saponaceum Fr. 

 on various tree roots. 



Mycena Fries (p. 450) 



Small; pileus usually bell- 

 shaped, rarely umbilicate, membranous and more or less striate, 

 at first with the straiglit margin applied to the stipe; gills only 

 slightly -toothed, not decurrent or only so by a tooth; stipe slen- 

 der, cartilaginous, usually 

 hollow. Fig. 331. 



A genus of some three 

 hundred species. 



M. epipterygia Scop. 



Five to ten cm. high; 

 pileus 1-2 cm. broad, vis- 

 cid when moist, ovate to 

 conic or campanulate, 

 later more expanded, ob- 

 tuse, the margin striate, 

 sometimes minutely 

 toothed, grayish, in age 

 often reddish; stipe 2 mm. 

 thick, flexuous or straight 



Fig. 330.— Tricholoma. After Lloyd. 



with soft hairs at the base; gills decurrent by a small tooth, 

 varying in color from whitish through gray to a tinge of blue or red. 

 Usually a saprophyte, but injurious to various kinds of trees. 

 Widely distributed in the North temperate zone. 



