XXXVII.] 



PARASITIC FUNGI. 



333 



times (as when the plants are not fully developed) im- 

 possible to distinguish between one genus and the other. 

 Peronosporites, therefore, has without doubt relations with 

 the Saprolegniece, as correctly pointed out by Professor W. 



X-400- 



FIG. 140. SPORANGIUM OP A FOSSIL FUNGUS. 



Protomycites protogenes, W.Sm., in a slice from a rootlet of a fossil 



Lepidodendron. Enlarged 400 diameters. 



C. Williamson, F.K.S., in the Philosophical Tratisactions of 

 the Royal Society, 1881. 



We have a second representative of fungi of enormous 

 antiquity in a transparent silicified slice of a rootlet of 

 Lepidodendron from the coal measures, now in the British 



