68 THE CHICAGO ACADEMY OF SCIENCES 



latter form is Lentodium squamulosum Morg. (Journ. Cin. Soc. 

 Nat. Hist. 18, p. 36.) The perfect and imperfect forms have not 

 been found growing upon the same stump, but the two often occur 

 in close proximity. It is not possible to determine from an in- 

 spection of the upper surface of the growing plants whether they 

 have perfect or diseased gills. In many of the deformed speci- 

 mens the original structure of the gills can be made out ; in others 

 they are so closely covered with a network of mycelial threads 

 that the lamellae are entirely obscured. The stems of the perfect 

 plants are slender; those of the diseased ones are apt to be some- 

 what irregularly thickened and deformed. The spores are 

 identical in both, being white, elliptic-oblong, 6 to 7 x 3 /a. 



Prof. Peck (N. Y. Mus. Rep't 25: 80), reports the occurrence 

 of the species in New York, and adds: "Nearly all the specimens 

 had the lamellae overgrown by a dense white mass of parasitic 

 fungoid filaments." Professor Morgan's plants were apparently 

 from a locality where the species is uniformly distorted by the 

 parasitic fungus. 



PANUS. 



Fleshy, coriaceous, tough, drying up, of fibrous texture, which 

 radiates into the hymenium; lamellae concrete with the hymeno- 

 phore, unequal, at length coriaceous, edge quite entire. Growing 

 on wood. Spores even, white, somewhat cylindrical. Some of 

 the fleshy forms are quite close to Pleurotus. (See Hennings' 

 note under Lentinus.} 



Pileus 5 cm. or more broad, smooth . . P. torulosus. 



Pileus 3 cm. or less broad, furfuraceous P. stipticus. 



Panus torulosus Fr. 



Pileus somewhat flesh-color, but varying rufescent-livid and 

 becoming violet, entire but very eccentric, fleshy, somewhat 

 compact when young, plano-infundibuliform, even, smooth; 

 flesh pallid. 



Lamellae decurrent, somewhat distant, simple, separate be- 

 hind, reddish then tan-color. 



Stem short, solid, oblique, tough, firm, commonly with gray 

 but often violaceous down. 



Pileus 5 to 7.5 cm. broad, stem about 2.5 cm. long; spores 

 6x3 /x. 



On stumps. River Forest. November. 

 Panus stipticus Fr. 



Pileus cinnamon, becoming pale, arid, thin, reniform, pruinose, 

 the cuticle separating into furfuraceous scales. 



Lamellae ending determinately thin, very narrow, crowded 

 elegantly connected by veins, cinnamon. 



Stem definitely lateral, compressed, dilated upwards, ascend- 

 ing, pruinose, paler than the lamellae. 



