1914) 
OVERHOLTS—THE POLYPORACEJE OF OHIO 127 
2. Pileus entirely dark brown or black; plants growing only on the wood of 
Ainus amd Полное. афо 1. Е. scutellatus 
2. Pileus not entirely black, the margin at least remaining white; plant 
growing on the wood of other deciduous trees, often on structural 
о JEREREESE О РЗ ss cn cs ve 2. F. ohiensis 
3. Hymenium or context pinkish or гейдйівһ............................... 4 
3. Hymenium or context whitish or уеШомівһ............................. 5 
4. Tubes more than 3 mm. long; plants usually growing on stumps and 
онай of Frozima.................. edo n BI 6. F. fraxineus 
4. Tubes not more than 3 mm. long; plants usually growing on the wood of 
ее Р е 7. Е. carneus 
5. Hymenium distinctly stratified, the strata of tubes separated by distinct 
layers of context; mouths of the tubes angular, usually glistening. .4. F. connatus 
5. Hymenium indistinctly stratified or if somewhat distinctly so the layers not 
separated by distinct layers of context; mouths of the tubes mostly circular, 
not giistening. ....................!......... 8.22. 7022... 6 
6. Plant growing on dead wood, usually of coniferous trees; mouths of the 
tubes small, averaging 3-5 to а пап........................ 5. F. pinicola 
6. Plant growing only on living Fraxinus; mouths of the tubes rather large, 
элект Ср. ee ere РОСТ 8. Р. fraxinophilus 
7. Pilei forming a densely imbricate, globose or cylindrical mass. . ..8. F. graveolens 
7. Pilei not forming a densely imbricate, globose or cylindrical mass. ........... 8 
8. Surface of the pileus not distinctly епегивбей........................ 9 
8. Surface of the pileus distinctly епегівбей........................... 13 
9. Context less than 5 mm. thick; sporophore often effused-reflexed or entirely 
resupinate; growing usually on dead wood................... 9. F. conchatus 
9. Context more than 5 mm. thick; sporophore generally sessile; often growing 
соаитлалныан;,,................................... 2 44 10 
10. Sporophore found only on Robinia ....................... 11. F. rimosus 
10. Sporophore found on some other һовб.............................. 11 
11. Tubes in the older layers distinctly white encrusted orstuffed......... t2. + | 
11. Tubes in the older layers not distinctly white encrusted or stuffed 12. F. Еъеграт 
12. Surface of the pileus black, somewhat shining, and rimose; margin 
rather thin and аешіе................................ 18. F. igniarius 
12. Surface of the pileus dull brown; margin thick and somewhat obtuse. . . . 
14. Е. nigricans 
13. Encrusting layer thin, easily indented; plants annual or sometimes reviving 
the second season but with the pileus distinct from and coming out below 
(0071 4 Ви 1 ......,................і.........222 17. F. lobatus 
13. Encrusting layer thick and horny; plants strictly perennial.............. 14 
14. Plant growing only on species of Ргитив.................... 10. F. fulvus 
14. Plant growing on some other һові................................ 15 
15. Content band and төсіу......................і............ 18. Е. igniarius 
ЕХ. 2.....................ӛ...).. C$ ma 5 I0 
16. Mouths of the tubes medium-sized, averaging 3 to a mm.; spores white 
15. F. fomentarius 
16. Mouths of the tubes minute, averaging 5 to а mm; spores brown...... 
16. F. applanatus 
