26 



Bulletin 138. 



growth of many plants. One of the reasons why the plant grows in 

 an upright position is that this influence directs it away from the earth. 

 This is easily observed in placing young and rapidly growing speci- 

 men-s in a horizontal position. In a few hours the stem end near the 

 pileus begins to turn upward, and the plant has taken the form shown 

 in figure 107. This plant was lying on its side for only about one or 

 two hours, and the stimulus which it received in this position during 

 the short period caused it to turn after it had been stood upright 

 again. A view of the under side of this same plant is shown in figure 

 108, and in figure 109 a diagonal view, which represents well the form 

 and attachment of the annulus to the stem. 



107. — Amanita phalloidcs. Plant turned to one side, after Jtaving been placed in 

 a horizontal position, by the directive force of giavity. 



Other forms of the Amanita pJialloides occur in which the pileus is 

 yellow, or greenish, instead of white, and sometimes bits of the volva 

 remain adherent to the surface of the pileus in the form of whitish 

 patches. There are other species of the genus Amanita which cannot 

 be discussed in this bulletin, but will be illustrated in a future one. 



Those who are not familiar with the three plants here illustrated, 

 and who desire to be able to recognize them, are advised to search the 

 pastures, etc., for the Agaricus camfestris and Lepiota naucifia, and 

 also the damp woods for the Amanita phalloides and to compare the 

 plants found there with these descriptions. In this way familiarity with 



