416 IOWA ACADEMY OF SCIENCE 



has laid the foundation for a satisfactory revision of the entire 

 family. The primary characters used are not merely colors and 

 superficial external resemblances which might be accidental, but 

 a series of correlated characters so based upon the entire fungus 

 as to insure a workable and logical grouping of species. Those 

 members of the group which have smooth spores also hare light 

 colored flesh and lend themselves to further segregation on the 

 basis of habit, of hymenial structure, and of habitat, while those 

 species with roughened spores have darker flesh and may be 

 further segregated on the basis of spore markings, spore color, 

 texture, and habit. This classification is accordingly adopted in 

 the present paper as it represents a grouping of species on the 

 basis of relationships and in a manner such as to make the family 

 more easily studied than to follow some of the earlier writers. 



KEY TO SPECIES. 



Hymenophore usually light colored, white to reddish or gray; 

 spores smooth, hyaline. 

 Terrestrial; hymenophore stipitate, fleshy. . . .1. Hydnum repandum 

 On wood; hymenophore sessile, dry or fleshy (in No. 6 some- 

 times stipitate, but not fleshy). 

 Hymenophore more or less tuberculiform or branched, fleshy 

 to sub-fleshy, white or yellowish. 

 Pileus more or less branched from the base. 

 Teeth uniformly distributed over the entire under sur- 

 face of the branches 2. Martina flagellum 



Teeth so distributed as to leave a bare region at the 



base of the branches 3. Manina coralloides 



Pileus more or less massive and tubercular, unbranched 



4. Manina cordiformis 



Hymenophore pileate to resupinate, sessile or stipitate. 

 Substance dry. 



Pileus sessile and decurrent to resupinate, more or less 



gregarious and confluent 5. Steceherinum ochraceum 



Pileus more or less stipitate or subsessile. 



Hymenophore large and complicated, even stipitate 



forms often confluent; teeth straight 



6. Steceherinum adustum 



Hymenophore smaller and simple, rarely totally con- 

 fluent, teeth flexuose 7. Steceherinum pusillum 



Substance fleshy. 



Surface densely strigose to tomentose, gummy when dry 



8. Creolophus puleherrimus 



Surface rather smooth, white, not drying gummy 



9. Creolophus cirratus 



