MourritL: THe PoryporaceaE or Nortu America 601 
Synopsis of the North American Species 
1. Context pallid to tawny. Pie * 
Context umbrinous-chestnut, 5. 
2. Spores over 6 1 long, verrucose, ferruginous. SS 
Spores less than 6 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 
ees, 4. 
Context pallid; plants usually stipitate, annual, growing on hemlock. 1. G. ¢sueae. 
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. Ocrstedii. 
6. Pileus zonate, even; tubes not stratified. 6. G. zonatum. 
Pileus sulcate, azonate ; tubes stratified. 7. G. sulcatum. 
1. 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 I-4 cm.;* surface gla- 
brous, uneven, concentrically sulcate, laccate, lustrous, yellowish- 
ted 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, I-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, 
€dges obtuse, becoming acute: spores ovoid, obtuse at the 
Summit, attenuate and truncate at the base, verrucose, yellowish- 
Own, 9-11 x 6-8 p: 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 7suga Canadensis, wpon 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- 
* These figures indicate length, breadth and thickness respectively. When the stipe 
4s lateral the pileus is an outgrowth from it and length is measured in the direction of 
“Ss 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 
i Settled, breadth and thickness need no explanation. 
