452 THE FUNGI WHICH CAUSE PLANT DISEASE 



Pholiota Fries (p. 449) 



Pileus symmetrical, more or less thick, fleshy, with a veil 



which forms an amiulus; gills adnate, becoming rusty at maturity. 



Kg. 321. 



P. aurivilla (Bat.) Quel, and P. squarrosa Mtlll. occur on 



deciduous trees, especially on the 



apple. 



P. spectabilis Fr. is occasionally 

 parasitic on oaks. 



P. mutabilis (Scha.) Quel, is a root 

 parasite on trees. 

 P. adiposa Fries. 



Cap mediiun, 5-10 cm. wide, yellow, 

 very sticky when moist, with spread- 

 ing or erect rust-brown scales which 

 Fig. 320.— Psiiocybe pennata. sometimes disappear when old, convex 



After Cooke. ^^ pj^^^^^. ^^^^ ^^^ ^^ ^^ j_2 cm., 



yellow, paler above and darker, scaly below the more or less im- 

 perfect tufted ring, solid or stuffed; gills adnate, yellowish to rust- 

 colored, broad, crowded; spores rust-colored, elliptic, 7-8 x 5 ju. 

 The name may refer to the sticky cap. 



Chiefly a saprophyte, occasionally on living trees, both decid- 

 uous trees and conifers, as a wound parasite. 



P. destruens Brand, occurs on poplar; P. cervinus Scha. on 

 various trees. 



Flammula Fries (p. 449) 



Pileus fleshy, margin at first incurved; stipe fleshy, fibrous, 

 well marked by the bright yellow or orange colored cap. 



About sixty species. 



F. alnicola Fr. is probably a root parasite."" 



F. penetrans Fr. and F. spumosa Fr. are regarded by Cavara *■* 

 as root parasites of forest trees. 



Volvaria Fries (p. 449) 

 Fleshy; gills free, white, later pink; spores ellipsoid, smooth; 



