[Vol. 3 

 206 ANNALS OF THE MISSOUEI BOTANICAL GARDEN 



I. Fructification not *' ferruginous " j spores not wax-yellow under the 



microscope 4 



2. Without cystidia 3 



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

 ing from the hymenium 4. K. canadensis 



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



ulate 1. B. ferrugineus 



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



spores ; spores aculeate . 2. H. ruhiginosus 



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



menial hyphae colored like the spores; spores echinulate 3. H. sub 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 drab to fuscous and Chaetura-drab, sepa- 

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

 under the microscope; hyphae 4r-5/i in diameter; spores aculeate or 



coarsely tuberculate 5. B. umhrinus 



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

 colored next to substratum, hyaline in subhymenium, 4-5/x in diameter; 



spores umber, aculeate, the body 5-6/i in diameter or 5-6x4-5/* 



21. H. suhvinosus 



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

 concolorous; hyphae near the substratum 8-10/i, or more, in diameter; 



spores echinulate, the body 7-9/t in diameter 12. H. isabelUnus 



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 yellowi^ 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/* 



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, 250-3 50/t thick; hyphae 

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



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



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

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

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

 ulate 7. H. spongiosum 



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



lose or rough ; known from New Hampshire and Massachusetts 



8. H. spiniferus 



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

 loosely interwoven, 2%-4/i in diameter, with some rope-like strands 

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

 tions by KHO solution 9. H. 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. H. olivascens 



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



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



under the microscope, echinulate ; known from New Hampshire 



15. E. sparsus 



