[Vol. 2 



716 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Illustrations: Bot. Gaz. 16: pi. 12. — Jour. Cine. Soc. Nat. 

 Hist. 18: pi. 1. f. 4 (as P. circumstans Morg.). 



Specimens examined: Anderson, Paras. Fung. Mont. 537 

 (as P. fraxinophilus). — Baker, PL N. N. Mex. 55. — Mo. Bot. 

 Gard. Herb. 4272 (New Mexico). — Burt Herb, (collections 

 from Montana and New Mexico). Also reported from North 

 Dakota and Colorado. 



2. Fomes fraxinophilus Peck. 



Pileus convex to somewhat ungulate, 2-25 X 3.5-40 X 1.5- 

 10 cm., at first white, soon grayish black or black, not rugose, 

 somewhat rimose with age, sometimes sulcate; context woody, 

 0.5-1.5 cm. thick ; tubes 2-4 mm. long each season, indistinctly 

 stratified, the mouths white to brownish, averaging 2-3 to a 

 mm.; spores ellipsoid to ovoid, 5-6 X 6-7 n; cystidia none; 

 hyphae 3-5 /*. 



On living or dead ash trees. 



Illustrations : U. S. Dept. Agr., Bur. PI. Ind. Bui. 32 : pi. 2. — 

 Hard, Mushrooms, /. 350. 



Specimens examined: Ell. & Ev. N. Am. Fung. 3302 (Kan- 

 sas) ; Fung. Col. 909 (Kansas).— Mo. Bot. Gard. Herb. 4780, 

 1437, 4826 (Missouri). — Burt Herb, (collections from Kan- 

 sas).— Overholts Herb. 46, 157, 159, 122, etc. (Ohio), 559, 624 

 (Missouri), 626 (Iowa). Also reported from Kentucky, Ne- 

 braska, Pennsylvania, Indiana, and New York. 



FOMES IGNIARIUS LlNN. EX GlLLET AND F. NIGRICANS FRIES 



Much confusion has existed concerning the limits of these 

 two species, and many different ideas are stated in the litera- 

 ture. Murrill has referred Fomes nigricans as a synonym for 

 F. igniarius. Lloyd has kept them apart, though recognizing 

 a close relationship between them. Others have concluded 

 with Bresadola that we are here dealing with two species that 

 can be easily separated on the presence or absence of setae 

 in the hymenium. Romell has held that such is not the case, 

 but that setae may be present or rare in either species, and 

 has stated that they are usually most abundant near the bot- 

 tom of the tubes. This would account for the fact that some 



