Dr. D. Ellis — A Jurassic Fossil Fungus. 103 



Before dealing with the criticisms it must be borne in mind that 

 the conclusions arrived at in the former paper were based on biological 

 grounds. The structures were such as a biologist recognizes to be 

 characteristic of fungi. They take the form of tubes coated with 

 ferric oxide and conform to fungal structures in the following 

 respects : — 



Sketch of animal remains in Dunliath Ferruginous Lhnestone (Jurassic), 

 N.W. Scotland, found in association with fungal hyphae. x 1400. 



1. The tubes are cylindrical and possess a membrane comparable 

 to the membranes of modern fungi. 



2. The diameter of the tubes is 2 fi to 4 fi (^i^ — yj-g-mm.). 



3. They branch and interweave in the manner characteristic of 

 modern fungi. (In addition they also form whorled branches: 



