MuRRiLL : The Polyporaceae of North America <;i»1 



Synopsis of tlie Nortli American HpecleH 



1. Context pallid to tawny. 2. 

 Context umbrinous-chestnut. 5. 



2. Spores over 6 // long, verrucose, ferruginous. j. 

 Spores less than 6/z long, smooth, pale; pileus less than 3 cm. broad, margin en- 

 tire ; tubes not stratified. 4. G. parvulum. 



3. Context ochraceous to fulvous ; plants stipitate or sessile, growing on deciduous 



trees. 4. 



Context pallid; plants usually stipitate, annual, growing on hemlock, i. G. tsttiae. 



4. Plants stipitate, or rarely sessile, perennial ; margin of pileus truncate at maturity. 



2. G. pseudoboletus. 

 Plants sessile, annual ; margin of pileus acute. 3. G. sessile. 



5. Spores smooth, pale yellowish brown. 6. 

 Spores roughly echinulate, dark brown ; pileus sessile, very thick, its diameter 



decreasing downward ; context less than one third the length of the tubes. 



5. G. Oerstedii. 



6. Pileus zonate, even ; tubes not stratified. 6. G. zonatum. 

 Pileus sulcate, azonate ; tubes stratified. 7. G. sulcatum. 



I. Ganoderma tsugae sp. nov. 



A conspicuous reddish-chestnut fungus growing on dead or 

 dying hemlock. Pileus corky to woody, fan-shaped, convex 

 above, concave below, 4-20 x 5-25 x 1-4 cm.;* surface gla- 

 brous, uneven, concentrically sulcate, laccate, lustrous, yellowish- 

 red to mahogany-colored, at length black ; margin light-yellow, 

 acute, becoming concolorous, truncate, and marked with many 

 shallow furrows, often undulate and at times more or less lobed : 

 context soft-corky, radiate-fibrous, white or nearly so, 1-3 cm. 

 thick; tubes annual, 0.5-0.75 cm. long, 6-4 to a mm., brown 

 within, mouths circular or polygonal, white to light-cinnamon, 

 edges obtuse, becoming acute : spores ovoid, obtuse at the 

 summit, attenuate and truncate at the base, verrucose, yellowish- 

 brown, 9-1 1 X 6-8 fi : stipe lateral, ascending, frequently forked, 

 cylindrical, equal, 2-20 x 1-4 cm., resembling the pileus in color, 

 surface and context. 



This fungus occurs only on Tsuga Cattadefisis, upon the decay- 

 ing trunks and roots of which it is very abundant. In West Vir- 

 ginia and New York it has been found full grown as early as June, 

 but it may not reach maturity until autumn, when it speedily de- 



* The.se figures indicate length, breadth and thickness respectively. When the stipe 

 is lateral the pileus is an outgrowth from it and length is measured in the direction of 

 this growth. When the pileus is sessile, the tubercle marking the beginning of growth 

 may be considered a lateral stipe much reduced. When the question of length is 

 settled, breadth and thickness need no explanation. 



