1918] The Lactakias of North Carolijsa 39 



30a. Lactarius chrysorheus. Form A, with unchanging milk. 



Plate 40. 



In Chapel Hill we have met with a plant in which the milk does 

 not change color when exposed, but which cannot otherwise be dis- 

 tinguished from L. chrysorheus. Collection No. 774 was described 

 as follows : 



Cap up to 6.5 cm. broad, sharply depressed in center and some- 

 times with a deep sinus on one side, surface quite glabrous, a light 

 brownish cream color with superficial layer of white slightly shiny 

 material. Rather faintly zoned with brownish-cream and nearly 

 white lines, the darker zones apparently formed by collapse of the 

 white stuff, the zones, spotted. Flesh chalk white and not changing 

 when cut. ]\rilk white, not changing, moderately peppery. 



Gills changing from white to a flesh-cream color, becoming brown- 

 ish-yellow when bruised, narrow and close, many short ones and a few 

 forking, slightly decurrent. 



Stem white above, about color of cap elsewhere, marked with dis- 

 tinct pock-like pits which may or may not not be more deeply colored 

 than the rest ; hollow. 



Spores light cream, subspherical, warted, one large oil drop, G-7.5 x 

 7.5-9ai in diameter. The difference in size of the spores between this 

 and the typical form as shown in Plate 40, figs. 20 and 21, is not 

 significant, as the difference is not greater than normal in the species. 



The smooth, zonate cap, and persistently white, acrid milk would 

 indicate a relationship to L. insulsus, but the gills in that species are 

 much wider and less close and very different in color in both the frcsli 

 and dry state, and the species is larger than L. chri/sorhcus. Our 

 dried plants of No. 774 look exactly like dried plants of the latter 

 species. 

 774. Near Howell's Brook, September 16, 1913. Photo. 



31. Lactarius quietus Fr.? 



Plate 40. 



Our one collection that I refer doubtfully to this species is a thin, 

 broad, low ])liiut. with much more the aspect of a Trirholoma than of 



