EXPLANATION OF PLATE XVIII 



is Macbr., p. 122. 



Fig. I. Tip of the empty sporangium, highly magnified. 

 From micro-photograph. 



Stemonitis pallida Wing., p. 123. 



Fig. 2. Tip of the sporangium, empty, magnified as Fig. I. 

 From micro-photograph. 



Rcticularia lycoperdon Bull., p. 149. 

 Fig. 3. .Ethalium, natural size. The cortex is silver-white. 



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