SAPROPHYTIC FUNGI OF EASTERN IOWA. 



13 



5. PoRiA RUFA ScJiradcr. 



Fructification resupinate, effused, thin, adnate, smootli, de- 

 terminate sanguineous-rufous; pores small, thin, sharp. 



Rare on rotten sap-wood of various sorts, distinct from all 

 here listed by its bright red color. It adheres tightly to the 

 substratum and is developed from the center outwardly, the 

 formation of pores preceded by a thin reddish mycelial web 

 which has a definite border, but shows no tendency to become 

 reflexed. Pores in our specimens are pretty large and the 

 reference so far doubtful. 



6. PoRiA viNCTA Berkeley. 



Entirely resupinate, the center quite thick, the margin 

 almost free, thin, reddish above; pores very small, pallid; con- 

 text wood-colored. 



x\ very delicate beautiful little species distinguished by its 

 small thin regular pores forming an even, uniform fruiting sur- 

 face, this girt with a narrow sterile band of white. Our speci- 

 mens are several centimetres in extent, but very thin. They 

 correspond exactly with N. A. F. 921. 



7. Porta obducens Persoou. 



Fructification effused, forming a crust, innate, firm, white, 

 altogether formed from very small, crowded, equal, distinctly 

 stratose pores; older strata alutaceous-pallid; spores ellip- 

 soidal, minute and h^'aline. 



Not common. Found occasionally on old oak rails where 

 specimens may persist several years adding stratum after 

 stratum of minute pores, each layer completely concealing that 

 of the previous year as in Fonies ulmariiis for example. The 

 pores are very short, about five strata make up 3 mm in 

 thickness, although this probably varies. Whole fungus 

 about 15-18 mm in diameter. N. A. F. 503. 



8. PoRiA mollusca Fries. 



Fructification effused, thin, soft, white with a byssine, radi- 

 ating-fibrillose border; pores developed from various centers, 

 small, thin, round, unequal, lacerate, fading. 



