230 



DEVELOPMENT OF A MUSHROOM 



spreads out like an umbrella, rupturing the veil, a part of which 

 clings to the stalk (Fig. 167, A, a) in the form of a ring, the 

 annulus, and a part may also hang in the form of ragged fila- 



FIG. 167. Habit of a poisonous mushroom, Amanita: A, the mature 

 mushroom s, stipe ; p, pileus ; g, gills ; a, annulus ; v, volva, a part of 

 which appears in patches on the top of the pileus. C, young form of the 

 Amanita, the volva beginning to break. D, later development, the volva 

 completely ruptured, disclosing the pileus, stipe and velum, vl. H. O. 

 Hanson. 



ments from the edge of the pileus. If a volva is formed, this 

 is also ruptured by the elongation of the stipe, forming a cup at 

 the base of the stipe, and usually portions also remain attached to 

 the top of the pileus as scales and patches (Fig. 167, A, D). 

 The structure of the mushroom is very simple. The stipe con- 



