488 



RESEARCHES ON FUNGI 



Observations on the Production of Spore-clouds by a large Pleurotus 

 ostreatus Fruit-body growirig under Natural Conditions.— cont. 



As shown by the Table, the fruit-body ^vas observed shedding 

 spores from December 1 to December 30. On December 30 1 sailed 

 for Oanada, in consequence of which on that day my observations 

 were brought to a conclusion. Tn all probability the fruit-body 

 actually shed spores for some days prior to December I and for 

 some days alter December 30, although no observations were made 

 during these periods. We may therefore conclude that, whereas 

 the duration of the spore-fall period actually observed was four 

 weeks and one day, the duration of the full spore-fall period must 

 have been at least five weeks. Excepting possibly during a few 

 brief hours when the night air cooled to about the freezing-point of 



