8 NORTH AMERICAN FLORA [VoLuME 9 
Hymenophore very large, attaining a thickness of 3-4 cm. 
Hymenium pallid. 1. F. tropicalis. 
Hymenium umbrinous. 2. F. dryophila. 
Hymenophore 1-2 em. thick at maturity. . 
Hymenium ashy-white when young, discolored with age. 3. F. cubensis. 
Hymenium some shade of brown. . 
Tubes thick-walled, very oblique. 4. F. obligutformis. 
Tubes thin-walled, perpendicular. 5. &. Langlotsit. 
Hymenophore less than 1 cm. thick at maturity. 
Hymenium not distinctly stratified. 
Tubes ferruginous within; species confined to Tsuga. 6. F. tsugina. 
Tubes fulvous within ; species found on deciduous trees. 
Temperate species. 
Tubes whitish-stuffed; spores 4 ; species confined to Prunus. 7. F. prunicola. 
Tubes yellowish-stuffed ; spores 5-6; species found onoak. 8. F. Zarleae. 
Tropical species. 
Context ferruginous-fulvous. 9. F. undulata. 
_ Context dark-fulvous to latericeous, 10. F. cinchonensis, 
Hymenium distinctly stratified. 
Temperate species. 
Margin becoming tumid and blackish with age. ll. F. pereffusa, 
Margin not as above. ' ot 
Mouths of tubes angular, thin-walled. 12. F. Lloydit. 
Mouths of tubes subcircular, thick-walled. 
Hymenium very distinctly stratified in many layers, tubes 
whitish-stuffed. 13. F. laminate. 
Hymenium less distinctly stratified in 2-3 layers, tubes not 
whitish-stuffed. . 14. F. ohiensts. 
Tropical species. : 
Spores 3-4; cystidia present. 15. F&F. flavomarginaia. 
Spores 5-7 » ; cystidia none. 
Tubes very distinctly and evenly stratified, edges thin ; spores . 
Me 16. F. jamaicensis. 
Tubes unevenly stratified, edges thick ; spores 5-6 nu. 17. #. Maxont, 
1. Fomitiporia tropicalis (Cooke) Murrill. 
Fomes tropicalis Cooke, Grevillea 15: 22. 1886. 
Broadly effused, separable, at least with age, rigid, woody, 15-50 cm. long, 5-10 cm. 
broad, 14 cm. thick; margin rounded, determinate, entire or slightly undulate, smooth, 
white, becoming fuliginous and subshining with age: context inconspicuous, pale-fuscous ; 
hymenium convex, even, pallid; tubes distinctly stratified in several layers, which tend to 
separate with age, 5-8 mm. long each season, avellaneous within, the older layers tinted 
with isabelline, mouths very regular, circular, minute, 7-8 to a mm., edges thick, entire: 
spores subglobose, smooth, hyaline, 4“; hyphae subhyaline to avellaneous; cystidia none. 
TYPE LOCALITY: Demerara, Guiana. 
HaBitTaT: Dead trunks. 
DISTRIBUTION: Nicaragua and Jamaica; also in Guiana. 
2. Fomitiporia dryophila Murrill, sp. nov. 
Effused, inseparable, rigid, irregularly elliptical, 2-4 cm. thick; margin obtuse, ele- 
vated at times, determinate, ferruginous, smooth, becoming blackish and rimose with age: 
context woody, conspicuous, fulvous; hymenium plane or convex, nearly smooth, fer- 
ruginous to grayish-umbrinous ; tubes distinctly and several times stratified, 4-8 mm. long 
each season, fulvous within, somewhat lighter in the more recent layers, mouths subcircular, 
6 toamm., edges rather thin-walled, entire to slightly dentate: spores perfectly globose, 
smooth, thick-walled, hyaline, 7#; hyphae ferruginous, 3-4; cystidia none. 
Type collected at Back Bay, Mississippi, on a decayed live-oak stump, September 3, 1904, 
Esther S. Earle. cor 
DISTRIBUTION: Georgia, Florida, and Mississippi. 
3. Fomitiporia cubensis Murrill, sp. nov. 
Effused, irregular, inseparable, rigid, 1-2.5 cm. thick ; margin obtuse, elevated, nar- 
rowly sterile, glabrous or finely tomentose, undulate, ashy-white, blackening with age: 
context conspicuous, umbrinous, punky; hymenium very uneven, colliculose, more or less 
convex, pure ashy-white when young, discolored when older, distinctly and many times 
stratified; tubes whitish-stuffed, umbrinous in the older layers, grayish-avellaneous in 
