88 
25. 
25. 
27. 
27. 
29. 
29. 
81. 
81. 
33. 
33. 
35. 
35. 
37. 
37. 
39. 
39. 
41. 
41. 
[Vor. 1 
ANNALS OF THE MISSOURI BOTANICAL GARDEN 
24. Sporophore arising from the under side of a cup-shaped, sterile body; 
found only on dead branches of Ulmus.................. 6. P. conchifer 
24. Sporophore not arising from a cup-shaped, sterile body............. 25 
Margin of the pileus projecting 5 mm. or more beyond the hymenium; 
hymenium separating smoothly from the context in fresh specimens; found 
ev AL copes Я О. POPE TET 26. P. betulinus 
Plants not as аһоуе................................................. 26 
26. Hymenium bright виіріш-уеПом...................... 42. P. sulphureus 
26. Hymenium not bright sulphur-yellow.......... lle esses 27 
Pileus distinetly brown in color; context usually light brown ; hymenium 
changing color when ітіней.............................. 46. P. resinosus 
Pileus not brown in color; hymenium never changing color when bruised .. 28 
28. Hymenium more or less smoke-colored or Ыаек.................... 20 
28. Hymenium not at all smoke-colored or black... o.oo aaa. 32 
Pileus more than 4 mm. ӨМск........................................ 30 
Pileus not more than 4 mm. ӨМек.................................... 31 
30. Context fragrant, with the odor of anise.................. 23. P. fragrans 
30. Context not fragrant, odor sometimes disagreeable........ 24. P. fumosus 
Mouths of the tubes angular, minute, averaging 5-7 to a mm. ; dissepiments 
QU I "LH 22. P. adustus 
Mouths of the tubes circular or subcircular, medium sized, averaging 3-5 to a 
mm.; dissepiments ӨМіек................................... 24. Р. fumosus 
32. Context fibrous or coriaceous in fresh plants; pileus never more than 1.5 
em. thick, and usually much thinner.................. 20.0 cee eee. 33 
32. Context either soft, spongy and full of water or firm and corky, often 
fragile when dry; pileus often more than 1.5 em. thick.............. 43 
Hymenium broken up into іееіһ.......................2............. 34 
Hymenium entire or lacerate but not broken up into teeth. .............. 36 
34. Context more than 1 mm. ӚНіск................22......... 9. P. biformis 
34. Context not more than 1 mm. бһісек.................................. 35 
Plants growing only on the wood of coniferous trees............. 2. P. abietinus 
Plants growing only on the wood of deciduous trees........... 8. P. pargamenus 
36. Context 1 mm. or less бМісек.......................2.2..2..2........ 37 
36. Context more than 1 mm. ӨНісе.................................. 40 
Mouths of the tubes minute, averaging 4-6 to a mm.; hymenium never violet 
КЕШЕ Ы ee ны ИИ 20 38 
Mouths of the tubes larger, averaging 2-3 to a mm.; hymenium often violet 
DEM. ERE ET rE or oe Se eee 39 
38. Surface of the pileus villous or velvety; pileus multizonate, generally 
more than 2 om. Ьгоаф............................... 1. P. versicolor 
38. Surface of the pileus densely hirsute; pileus azonate or with one or two 
zones, generally less then 2 ст. broad.................... 4. Р. hirsutulus 
Plants growing only on the wood of coniferous trees............. 2. P. abietinus 
Plants growing only on the wood of deciduous trees 222222... 3. P. pargamenus 
40. Mouths of the tubes large, averaging 1-2 to a mm......... 9. P. biformis 
40. Mouths of the tubes medium sized, averaging 3-4 to а mm.......... 41 
Tubes more than 2 mm. long............... sess 7. P. pubescens 
Tubes not more than 2 mm. Іопр..................................... 42 
42. Surface of the pileus velvety to ҺітеШе..................... 5. P. hirsutus 
42. Surface of the pileus minutely pubescent or glabrous. ........ 8. P. Lloyd 
