Journal of Mycology 



VOLXJIklE 13-JTJIL,Y 1907 



TABLE OF CONTENTS 



SUMSTINE — Polyporus Pennsylvanicus Sp. Nov 137 ^ l»»«i 



Sheldon — A Study of the Leaf-Tip Blight of Dracaena Fragrans 138 " '^A.U: 



DuRAND — The Mycological Writings of Theodor Holmskjold, Etc... 141 s.t«i' .. 



Morgan — North American Species of Agaricaceae 143 



RicKSR — Third Supplement to New Genera of Fungi 154 



Kellbrman — Index to North American Mycology 158 ^^^i^l^t^ 



Kbllerman — Notes from Mycological Literature XXIV 169 



Editor's notes 184 



POLYPORUS PENNSYLVANICUS SP. NOV. 



DAVID R. SUMSTINE. 



Pileus orbicular, entire, convex to depressed, subumbilicate^ 

 2-6 cm. broad, even, glabrous or with few scattered innate fibrils, 

 pale ochraceous, tan-colored to isabelline, margin thin, acute, in- 

 flexed, with few fugacious cilia; context white, i-io mm. thick; 

 tubes white, unequally haxagonal, irregular, angular, 0.5-1 mm. 

 long, about 2 to a mm., varying in shape and size, dissepiments 

 thin, edges becoming serrulate or fimbriate, decurrent; spores 

 large, elliptic-fusoid, nucleate, hyaline ; stipe central or some- 

 times somewhat excentric, 2-4 cm. long, 2-10 mm. thick, con- 

 colorous with the pileus or a little lighter, yellow tomentose, 

 especially so at the base, solid, white within, increasing above- 

 and expanding into the pileus, sometimes the tubes are decur- 

 rent to the base of the stipe giving the stipe a lacerated or retic- 

 ulated appearance. 



The fresh plants emit a very perceptible nitrous odor. 



Growing on fallen sticks, Fern Hollow, Allegheny County, 

 Pennsylvania. 



June 12, 1906. (Type.) Also collected at Sandy Creek,. 

 Allegheny County. 



Type specimens are in the Herbarium of the Carnegie Mu- 

 seum, Pittsburgh, Pennsylvania. 



This plant is related to P. polyporus, P. arcularius, P. ele- 

 gans, P. lentus. It is most closely related to P. lentus if pub- 

 C3ished descriptions of this species are reliable. It seems, how- 

 ever, that P. lentus has not yet been found in America. P.. 



-^ (137) 



