Supplement 



(Plate CXCVII.) 



3-5 lines thick. This russula grows under or near pine, spruce or bal- 

 sam fir trees. It occurs from July to October. It is tender and palat- 

 able. The stems also are tender and may be cooked with the caps. 

 Peck. 



RllSSUla crustosa Pk. Rep., 1885: 40. Pileus at first convex, 

 then nearly plane or centrally depressed, slightly viscid when moist, 

 striate on the margin, brownish-yellow, greenish or subolivaceous, the 

 cuticle cracking and forming small 

 spot-like areolae or pseudo-verrucae. 

 Lamellae nearly entire, some of them 

 forked at the base, narrowed behind 

 and nearly free, white. Stem cylin- 

 drical, stuffed or hollow, white. 

 Spores white, subglobose, .0003 to 

 .00035 in. broad. Flesh white, taste 

 mild. 



Pileus 3 to 5 in. broad; stem I to 

 2.5 in. long, 6 to 12 lines thick. 



Rocky ground in thin woods and 

 in woods and open ground. New 

 York. July and August. 



In his Report for 1902, page 45, 

 Prof. Peck redescribes the species 

 with some slight changes and addi- 

 tions due to later accessions of ma- 

 terial, and adds: 



The crusted russula is closely re- 

 lated to the greenish russula (R. vir- 



escens}, and the cracked russula {R. cutefracta). From the former it 

 differs in its slightly viscid cap, of which the cuticle cracks and forms 

 small, crust-like patches or scales on the margin, but usually remains 

 entire in the center. From the latter it is distinct by the absence of 

 any red or purplish tints in the flesh and the stem. Even in purplish 

 specimens the flesh and stem are wholly white. 



The cap is very convex or almost hemispheric when young, nearly 

 plane or centrally depressed when mature. The surface cracks toward 

 the margin as in R. cutefracta, while the center nearly always remains 



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