[Vol. 3 

 206 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



I. Fructification not "ferruginous"; spores not wax-yellow under the 



microscope 4 



2. Without cystidia 3 



2. With cystidia consisting of non-incrusted, cyliudric organs protrud- 

 ing from the hymenium 4. H. canadensis 



3. Fructification adnate; all hyphae colored like the spores; spores echin- 



ulate 1. R. ferrugineus 



3. Fructification separable from substratum ; all hyphae colored like the 



spores ; spores aculeate S. H. rubiginosus 



3. Fructification separable; hyphae dark-colored next to substratum; subhy- 



uienial hyphae colored like the spores; spores echinulate 3. H. suh ferrugineus 



4. Hyphae not nodose-septate, i. e., not having clamp connections 5 



4. Hyphae nodose-septate, i. e., with clamp connections 6 



5. Fructification ranging from drat? to fuscous and Chaetura-drab, sepa- 

 rable; spores and hyphae concolorous, dark olive-buff to buffy brown 

 under the microscope; hyphae 4— o/i in diameter; spores aculeate or 



coarsely tubereulate 5. 13.. umbrinus 



5. Fructification vinaceous-brown becoming Kood's brown, adnate; hyphae 

 colored next to substratum, hyaline in subhymenium, 4-5|U in diameter; 



spores umber, aculeate, the body 5-Qii in diameter or 5-6x4-5ya 



21. E. subvinosus 



5. Fructification deep olive-buff to dark olive-buff, adnate; spores and hyphae 

 concolorous; hyphae near the substratum 8-lOyu, or more, in diameter; 



spores echinulate, the body 7-9ij. in diameter 12. H. isabellinus 



6. Without cystidia 7 



6. With cystidia consisting of non-incrusted cylindric organs protrud- 

 ing from the hymenium 11. H. pilosus 



7. Margin of the same color as the hymenial surface 8 



7. Margin of different color from the hymenial surface 12 



8. Fructification dark-colored — cinnamon-drab, umber, sepia, fuscous — 



and the hyphae concolorous 9 



8. Fructification sepia or citrine, and the hyphae yellowis'n or hyaline 



under the microscope after treatment with KHO solution 10 



8. Fructification varying in brown from Saccardo's umber and snuff- 

 brown to cinnamon-brown ; hyphae and spores concolorous with 



the fructification; spores echinulate, the body 6-8x5-7^c 



13. H. pannosus 



8. Fructification between cartridge-buff and olive-buff; hyphae and 

 spores snuff-brown under the microscope; known from Washing- 

 ton only 14. H. avellaneus 



8. Fructification drab or gray, and the hyphae hyaline under the mi- 

 croscope 11 



9. Fructification with a distinct vinaceous tinge, 250-350/i thick ; hyphae 

 suberect, not rough-walled, often collapsed, rather paler than the spores 



under the microscope; spores aculeate or echinulate 6. H. fxiscus 



9. Fructification varying from Saccardo's umber to bister, rarely fuscous, 

 200-1200/i thick; hyphae thick -walled, not rough-walled, extending in 

 all directions in the subiculum and loosely interwoven; spores echin- 

 ulate 7. E. spongiosus 



9. Eesembling H. spongiosus but many hyphae have the wall minutely spinu- 



lose or rough; known, from New Hampshire and Massachusetts 



8. E. spiniferus 



10. Fructification sepia, separable, 200-400/i thick; hyphae thin-walled, 

 loosely interwoven, 2%-4;a in diameter, with some rope-like strands 

 next to substratum ; no noteworthy color change caused in sec- 

 tions by KHO solution 9. E. granulosus 



10. Fructification citrine, adnate, the color destroyed and dissolved by 

 KHO solution which becomes colored brownish; hyphae thin-walled, 

 5-6/^ in diameter 10. E. olivascens 



II. Fructification byssoid, drab, adnate, 60-75At thick; hyphae short-celled, 



irregular in form and diameter, 4-6/li in diameter; spores grayish olive 



under the microscope, echinulate ; known from New Hampshire 



15. E. sparsus 



