PLATE 24 



Fig. 21. Ceriomyces crassus, Form A. A section showing the hairs on the 

 surface of the pileus and something of the structure of the context. (Dried 

 material, No. 72). X 250 diam. 



Fig. 22. Ceriomyces communis, Form A. A section showing the structure 

 of the rind on the surface of the stij^e. (Dried material contributed by Dr. 

 W. A. Murrill). X 250 diam. 



Fig. 23. liostkovites californicus. A section of the pileus showing the hairs 

 on the surface and something of the structure of the context. (Dried material, 

 No. 251). X 250 diam. 



Fig. 24. Ceriomyces communis, Form A. A section of the surface of the 

 pileus showing the very slight differentiation of the rind. (Dried material 

 contributed by Dr. W. A. Murrill). X 250 diam. 



Fig. 25. A series of sections of Ceriomyces auriftammeus showing the struc- 

 ture of the stipe. (All from dried material contributed by Dr. W. A. Murrill). 

 All X 250 diam. 



(a) A section showing the structure of the rind. 



(6), {c) A single hypha from the context showing the relative length and 

 diameter of the divisions. 



(d) This figure shows the typical method of branching of the hyphae. 



(e) This figure shows the union of two hyphae. 



Fig. 26. Ceriomyces communis. Form B. A section showing the surface of 

 the stipe with the hyphae lying parallel to the surface and a single tuft made 

 up of gland-like hyphal tips. (No. 238). X 250 diam. 



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