Part 1, 1907] POLYPORACEAE 
Surface of pileus not very smooth. 
Surface sodden, rough, white, becoming blackish, especially at the 
31 
margin. 8. LT. Sprague. 
: Surface tuberculose, ochraceous, not becoming blackish. 9. T. tiltiophila. 
Pileus small, rarely exceeding 5cm. in diameter. 
Pileus resinous or cartilaginous in appearance. 
Tubes sharply and deeply lacerate. 10. 7. cerifiuus. 
Tubes not as above. 
Pileus 3-4 cm. broad ; tubes 6 to a mm. ll. 7. versicutis. 
Pileus 1 cm. broad; tubes 4to amm. 12. T. semisupinus. 
Pileus neither resinous nor cartilaginous. 
Tubes large, irregular, lacerate, 1-2 toa mm. 13. 7. undosus. 
Tubes much smailer, usually regular and entire. 
Species confined to temperate regions. 
Surface zonate. 
Pileus 1-3 mim. thick, not effused. 14. 7. crispellus. 
Pileus 5 mm. or more thick, effused-reflexed. 15. 7. Elitsianus. 
Surface azonate. 
Surface conspicuously villose or tomentose. 
Pileus more or less bluish, not effused. 16. 7. caestus. 
Pileus not bluish, effused-reflexed. 17. T. semipileatus. 
Surface glabrous or nearly so. 
Surface pelliculose, more or less tinged with gray. 18. 7. chioneus. 
Surface white, without a pellicle. 
Pileus about 2 mm. thick. 19. 7. Bartholomaet, 
Pileus much thicker. 
Edges of tubes obtuse, entire. 20. L. anceps. 
Edges of tubes very thin, lacerate. 21. T. lacteus. 
Species confined to tropical regions. 
Pileus milk-white, unchanging, very soft and very friable. 22. T. leucomallus. 
Pileus somewhat brownish, not very friable. 
Tubes 3-4 mm. long, much longer than the thickness of the 
very thin context. 23. T. albogilvus, 
Tubes short, about equal to the thickness of the context. 
Hymenium subfulvous; spores ovoid, 34 x, 
Hymenium white to pallid ; spores cylindrical, 4x 1x. 
24, 
25. 
T. fulvitinctus, 
T. duracinus. 
1. Tyromyces guttulatus (Peck) Murrill. 
si is maculatus Peck, Ann. Rep. N. Y. State Mus, 26: 69. 1874. Not P. maculatus Berk. 
Polyporus guttulatus Peck, in Sacec. Syll. 6: 106. 1888. 
Pileus cespitose or gregarious, broad, applanate, sessile or attached by an attenuate 
base, cheesy-soft when fresh, rigid and fragile when dry, 5-7 10-15  0.5-1.5 cm. ; sur- 
face white or yellowish-white, becoming sordid with age, especially at the margin, glabrous, 
somewhat uneven, slightly zonate at times, marked with numerous rounded, depressed, 
watery spots, either scattered promiscuously or arranged in zones; margin thin, white to 
discolored, undulate or lobed: context white, cheesy to fragile, 3-8 mm. thick; tubes 
white, 3-6 mm. long, mouths small, angular, glistening, 4-5 toa mm., white to avellaneous 
or umbrinous, often sordid-spotted in dried specimens, edges thin, fragile, lacerate: spores 
globose, smooth, hyaline, 54; hyphae 6; cystidia none. 
TYPE LOCALITY : Worcester, New York. 
HapitaT: Fallen coniferous trunks in woods. 
DISTRIBUTION; Eastern Canada to Ohio. 
2. Tyromyces palustris (Berk. & Curt.) Murrill. 
Polyporus palustris Berk. & Curt. Grevillea 1: 51. 1872. 
Pileus sessile, dimidiate, convex above, plane or concave below, much thicker behind, 
subimbricate, fleshy-tough to rigid and somewhat friable when dry, 4-6 < 8-10 K 1-3 cm.; 
surface smooth, glabrous, white to slightly yellowish, sometimes rough and tubercular 
behind; margin thin or thick, entire or undulate, white, becoming slightly discolored: 
context 1-2 cm. thick, white, fleshy-fibrous when fresh, becoming firm and somewhat fri- 
able when dry; tubes 2-5 mm. long, white to slightly yellowish within, about 4 to a mm., 
edges thin, white to yellowish, entire to dentate: spores smooth, hyaline. 
TYPE LOCALITY: South Carolina. 
HaziraT: Trunks of Pinus palustris and certain other species of southern pines. 
DISTRIBUTION : Georgia, Sguth Carolina, and Florida; Bahamas; Cuba. 
