Fossil Fimgi. 2 1 3 



pliould be considered a^ resting-spores or oospores witli 

 a very thick wall, or whether the outer wall is that of an 

 oogonium containing a single oosphere. As to their 

 fungoid nature and also their close resemblance to 

 the Pliy corny cetes there can be no reason for donbt. 



Peronosporites antirpuarius, W. Sm. (fig. 136)- 

 Mycelium witli numerous tran verse septa, 7-9 jjl 

 thick, variously branched ; oogonia usually terminal 

 on short branches, rarely intercalary, globose or 

 slightly attenuated at the base, 40-60 ^jl diameter. 



Peronosj^writes cmtiquarms, W. Sm., Gard. Chron., 

 with fig., Oct. 20fch, 1877; Diseases of Field and 

 Garden Crops, p. 331, with fig. 



Mr. Carruthers, F.R.S., of the British Museum, 

 also gave a brief description of the fuugus, accom- 

 panied by a small figure in his printed address, read 

 before the Geologists' Association in 1876. 



Williamson in Phil. Trans. Roy. Soc, vol. clxxii., 

 part ii., p. 299, pis. 48 and 54? 



In the vascular axis o^ Le[)idodendron, lower coal- 

 measures, West Yorkshire. 



Professor Williamson has the followino- remarks on 

 the present species : — 



" Some years ago Mr. Carruthers found a fossil 

 fungus in a fragment of a Lcindodendroib from the 

 lower coal-measures of West Yorkshire, of which he 

 gave a brief account in his annual address to the 

 Geologists' Association for 1876. Mr. Butterworth, 

 of Oldham, found a second example, which was de- 

 scribed and figured by Mr. Worthiugton Smith in 

 the Gardener's Chronicle for October 20, 1877, under 

 the name of Peronosporites anfiqicarius. Mr. Smith 



