PILE ATE HYDNACEAE FROM IOWA 417 



Hymenophore usually dark colored, terrestrial; spores roughened. 

 Hymenophore normally pileate and stipitate. 



Stipe central; spores coarsely tuberculate, colored. 



Surface of pileus obscurely or not at all zoned, more or 

 less uniform in color. 

 Brown; pileus obscurely zonate, more or less deformed 



■. . . . 10. Hydnellum scorbiculatum 



Cinnamon-colored 11. Hydnellum velutinum 



Surface of pileus zonate. 



Small; pileus less than 4 cm. wide, very thin 



12. Hydnellum parvum 



Larger; pileus 3-15 cm. wide, rather thick 



13. Hydnellum sonatum 



Stipe lateral; spores hyaline 14. Auriscalpium vulgare 



Hymenophore sessile to resupinate, of branched processes, 



clothed with a dense coat of branched hairs 



15. Gliodon strigosus 



I. HYDMM L. 



According to the present treatment this genus is limited to 

 those stipitate, terrestrial species with smooth, light colored or 

 hyaline spores and light to yellowish or reddish flesh. We have 

 a single species. 



1. H. REPANDUM L. 



A cosmopolitan species of extreme variability which is found 

 on the ground in woods from midsummer to autumn. "When 

 growing the fungus is light in color, varying from creamy to 

 tawny. Both collections listed here appear to belong to this 

 species, although the second does not agree in all respects with 

 the first, as the individuals are a trifle more robust and the teeth 

 slightly more slender. 



Johnson county (Macbride), Ilesper. Winneshiek county 

 (Shimek). 



II. MANIXA Scop. 



Characterized by having a fleshy tuberculiform or branched, 

 laterally sessile or subsessile pileus; the teeth pendant; spores 

 smooth ; the sporophore always light colored, varying from white 

 to creamy, with a more or less coralline or beardlike appearances 

 always on wood. 



We have three species, the nomenclature of which is very 

 much involved owing to the widespread misinterpretation of 

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