PLEUROTUS OSTREATUS 



485 



to tTi trunV;T a VanZ\ «P°'-«-^l°"ds by Ple^urotus ostreatus. Fruit-bodies attached laterally 

 spore dLcharee A at^ 48° F Th "V^^"^^'""" ^' ^^ ^"^d C illustrate the effect of temperature on 

 spore-discharge A, at 48 F., 1 berating spores vigorously ; B, at 36° F., liberating spores feebly • 

 C at 32 F. (freezing-point), not liberating spores at all. D, a diagram showing how the electee 

 aTree T^r' ""^P^^"^ ^ ^^f^^^ spore-discharge at night. On the left a fruit^body, attached to 

 a tree, em tting vast numbers of spores in the manner shown at A above. The spores are revealed 

 as spore-clouds by means of the beam of light directed vertically upwards from Xe hanriamp 

 III °^^^t'-^«V'' ' ''''°'' the bea^ and sees the white clouds against the black shadows of the St' 

 The ob.servations on spore-discharge represented in A, B, and C were made at night with the hand 

 lamp. The emission of spo.es from A was also observed during the day in stron| diffused unlight 

 A, B, and C, natural size ; D, reduced to about f . » j e l.^«u suniigni;. 



