134 NEW YORK STATE MUSEUM 



12 Stem without a collar . . . . . . Cortinarius 



13 Tubes not easily separable from the cap . . . Boletinus 

 1 3 Tubes easily separable from the cap . . . . .Boletus 



14 With short branches bearing slender, pendent spines . H y d nu m 

 14 Without spines, spore surface even . . . . Clavaria 



Amanitopsis strangulata (Fr.) Rose 

 Strangulated Amanitopsis 



PLATE 44, fig. I-IO 



Pileus fleshy but rather thin, fragile, at first ovate, then broadly convex 

 or subcampanulate, finally nearly plane, warty, slightly viscid when moist, 

 deeply and distinctly striate on the margin, grayish brown or mouse color, 

 sometimes paler on the margin ; lamellae close, free, broader toward the 

 outer extremity, white or whitish ; stem equal or slightly tapering upward, 

 stuffed or hollow, floccose squamulose, white or whitish, the adherent remains 

 of the ruptured volva sometimes forming an imperfect or fragmentary annu- 

 lus near the base ; spores globose, .0004 to .0005 of an inch in diameter. 



The strangulated amanitopsis resembles the livid variety of the sheathed 

 amanitopsis in color and size, but it is easily distinguished by the warts of 

 the pileus and by the fragmentary remains of the ruptured volva or wrapper 

 at the base of the stem. The spores also are a little larger than in that 

 species. 



When the young plant first appears above the surface of the ground, 

 the cap is oval or somewhat egg-shaped, but it soon becomes more expanded 

 and finally nearly flat. In wet weather the margin sometimes curves upward, 

 making the cap appear concave above or centrally depressed. The warts 

 have a soft or somewhat woolly texture and are easily separable from the 

 cap. In the European plant they are represented as sometimes entirely 

 absent. In the American plant they are quite persistent on the center of 

 the cap, though they sometimes disappear from the thin plicate striate mar- 

 gin. They are represented in the figure of the species given by Fries in 

 his Icones as paler than the cap, but in our plant they are as dark as the cap 

 or sometimes even darker. The cap is grayish brown or mouse color, some- 

 times becoming paler or drab on the margin. 



