[Vol. 5 

 304 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



3. Old, dark, zonate specimens of above *Stage H. formosa 



3. Fructification stipitate, erect; stem bearing a single reniform pileus. . . . 



2. H. reniformis 



3. Not stipitate, but resupinate, or with pileus reflexed or sessile 4 



4. Always resupinate so far as known yet. Guard against locating 

 here the first-stratum stage of the stratose species and resupinate 



stages of reflexed species of the H. aspera group 5 



4. Reflexed or dimidiate; resupinate specimens of H. Cacao and B. 

 aspera have been found and perhaps may yet be found for the 



other species in this group 7 



5. Fructification clay-color to antique brown, 100-140 fi thick, with hyphae 

 loosely interwoven, suberec-t, 3-4 fj. in diameter; setae 30-75X6-8 n, 

 scattered in the outer half of fructification; on Corylus, Ostrya, and 



Vaccinium 18. H. arida 



5. Hyphal layer very thin usually and may be overlooked unless substratum 

 is included in the sections; setigerous layer up to 500 (i or more thick, 

 zonate; causes a pocketed rot of wood; in Cuba, Venezuela, and 



Brazil 19. H. unicolor 



5. Hyphal layer 1-2 mm. thick, very compact; setae few, 70-90X9 fi, start- 

 ing from the dark subhymenium; parasitic on living limbs of Alnus, 



Benzoin, etc., where they rub together 20. H. agglutinans 



6. Not cracked, antique brown to Brussels-brown, finally 2-6 strata 

 thick, with the setigerous layers 30-45 ix thick and equalled or 



exceeded by the alternating hyphal layers 21. H. cinnamomea 



6. Not cracked, antique brown to Brussels-brown, finally up to 15 

 strata thick; strata with layers thinner than in the preceding 

 species; paraphyses colored, with branched tips; in Panama 



22. H. digitata 



6. Cracking in drying, Argus-brown, very compact, finally several 

 strata thick, with setigerous layers 45-200 fj, thick, and exceeding 



the hyphal layers 23. H. spreta 



7. Setigerous layer 90 n thick, with setae crowded together in all its parts; 



in Cuba, Jamaica, and Venezuela 3. H. Cacao 



7. Setigerous layer not more than 60 /x thick 8 



8. Pileus rough on the upper side with strigose, matted fibers; hyme- 

 nium granular like that of Thelephora terrestris; margin with 

 bright-colored mycelial strands; in Cuba, Jamaica, and Venezuela 



^. H. aspera 



8, Pileus bay, sericeous, becoming somewhat zonate, radially plicate; 

 margin lobed, often proliferous, yellow ocher; setae very large, 



90-120X12-15 n; in Jamaica and Guiana 5. H. Berkeleyana 



8. Pileus Argus-brown above and beneath, concentrically sulcate and 

 somewhat zonate and shining above, very thin and papery; setae 

 65-90 X9-10J /J.; in South Carolina and the West Indies to Chile 



6. H. Sallei 



8. Pileus Brussels-brown to cinnamon-brown, radiately fibrillose with 

 adnate fibrils, concentrically ridged; hymenium snuff -brown; 

 setae 60-90x7^-10 m; from Ontario to New Jersey. . . .7. H. borealis 



9. Setigerous layer not more than 50 fi thick 10 



9. Setigerous layer more than 50 n thick 13 



10. Always resupinate so far as known. Compare also H. Curtisii and 



H. rigidulu, which are sometimes resupinate 11 



10. Usually reflexed or dimidiate, sometimes resupinate 12 



11. Hymenium Isabella-color to tawny olive, cracked, margin somewhat 

 sulphur-yellow; the adnate, bordering, dark zone next to substratum 



absent in some places; from Alabama to Mexico 2It. H. epichlora 



11. Hymenium between wood-brown and Saccardo's umber; intermediate 

 layer, connecting dark zone, and hyphal layer adnate to substratum are 



present ; in Cuba 25. H. dura 



12. Becoming narrowly reflexed, Benzo-brown, rather rigid; hymenium 

 Benzo-jjrown ; setae crowded together in all parts of the setigerous 

 layer; in Cuba and Venezuela 8. H. rigidula 



