[Vol. 2 



720 



ANNALS OP THE MISSOURI BOTANICAL GARDEN 



"smooth, hyaline/' but that conclusion is reached only from 

 inference. I find them to be cylindric, hyaline, smooth, 8-9 X 

 2.5-3.5 n. They thus differ from those of F. ohiensis, which 

 are ovoid with a truncate base, hyaline, smooth, 10-12 X 6-7 

 p. It is apparent then that the spores of F. ohiensis are 

 similar in shape to those found in all species recently segre- 

 gated into the genus Ganoderma, while those of F. scutellatus 



point to an alliance of that species 

 with the genus Trametes, they being 



Fig. 8. 



lalus. 



typical trametoid spores. 



It is only in rare cases that the 

 branching of the hyphae of the con- 

 text can be used as a distinguishing 

 character. The hyphae of F. scutel- 

 latus are much branched, while 

 those of F. ohiensis are practically 

 simple. These differences are shown 

 in figs. 



It is thus apparent that these 

 Hyphae of f. scutei- closely related species are separated 



by rather wide differences, and their 



7 and 8. 



determination need no longer be considered difficult. 

 The following descriptions are appended : 



1. Fomes scutellatus Schw. ex Cooke. 



Pileus convex, sometimes attached by the vertex and 







X 0.5-2 X 0.1 



cm., entirely dark 



broivn or black, at least when mature, slierhtlv sulcate: context 



ky, about 



thick; tubes 1-2 mm. Ion 



mouths 



pallid, averaging 4-5 per mm., thick- walled 



dric, 8-9 X 



cystidia none; hyphae hy 



light brown, much branched, 2-4 ix; basidia 6-9 a broad 



Usually growing on alder and 

 Specimens examined : Ell. & I 



N. Am. Funjr. 1597 



4469 (N 



Col. 1010 (Vermon 



Mo. Bot. Gard. Herb 



Jer 



Burt Herb, (collections from New 



York and Vermont).— Overholts Herb. 337 (01 



o 



da) 



Al 



ted from Ma 



394 

 Delaware, and Ala- 



bama 



