PILEATE HYDXACEAE FROM IOWA 421 



the pileus is subfleshy, becoming fragile on drying. The sporo- 

 phore is broadly effused, approaching resupinate, and not truly 

 imbricate. The statement by Banker 9 concerning " H. cir- 

 ratum Pers. often written incorrectly cirrhatum" that £i it seems 

 probable that the plants thus reported are H. pulcherrinium or 

 II. septentrionale" needs no further comment than his previous 

 statement that he has seen none of the specimens so referred. 

 Certainly our own material could never be confused with either 

 of these nor does it agree with any other species listed by 

 Banker. 



Johnson county (Shimek, "Wilson). 



V. HYDXELLUM P. Karsten. 



.V well defined group of species having coarsely tuberculate, 

 colored spores, and a central stipe which is always duplex in 

 texture, the central region being quite hard while the cortical 

 layers are feltlike. The pileus is fibrous and tough. All four 

 of our species are terrestrial. 



10. S. SCORBICULATUM (Fries.) Banker. {Hydnum scorbiculatum 



Fries.) 



The collection referred here contains two specimens which 

 are somewhat zonate, but with the teeth decidedly decurrent on 

 the stipe. The pileus is quite noticeably deformed on the upper 

 surface and has a broad sterile margin. The sporophores are 

 rather small. 



Johnson county (Macbride). 



11. S. VELUTINUM (Fries.) P. Karsten. (Hydnum velutinum Fries., 



H. spongipes Peck.) 



Two collections of a large cinnamon-colored species with a 

 very pronounced felty layer about the stipe are very evidently 

 this species. The pileus is quite thick, the surface very uneven, 

 and the outline quite irregular. The teeth are only slightly de- 

 current. 



Johnson county (Macbride). 



12. H. PARYl'LUM Banker. 



A single collection of five very small sporophores is the sole 

 representative of this species seen. The very small and extreme- 

 ly thin pileus distinguishes this species from //. -.omitum with 



9 Loc. cit., p. 135. 



