[Vol. 5 

 306 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



18. Tawny olive, not cracked, up to 90 /t thick; setae 60-90X9-12 n, 

 all starting from the dark zone next to the substratum; Ver- 

 mont to Pennsylvania and Illinois 32. H. episphaeria 



18. Dresden-brown, differs in structure from H. episphaeria by having 

 spores 7-9 X3i fi and by containing crystalline masses 12-15 n 

 in diameter; in Louisiana and Cuba 33. H. cervina 



18. Between bister and Vandyke-brown, slightly velvety when young, 

 becoming glabrous, cracked, 200-300 /x thick, dark and opaque; 

 setae 50-90X8-10 fi, starting in all parts of the fructification; 

 in Jamaica S-i- S. opaca 



18. Raw umber to mummy-brown, somewhat cracked, 30-75 /* thick; 

 setae 36-45X5-7 n; on Thuja and Tsuga; Vermont to Florida 

 and in British Columbia 35. H. tenuis 



18. Bister to warm sepia, somewhat colliculose, not cracked; 150-200 /i 

 thick; setae abundant, 60-75X8-9 fi, starting in all parts of the 

 fructification; with general aspect of resupinate E. rubiginosa but 

 thin and adnate; in Vermont, Maryland, Ohio, and Kentucky 

 36. H. fuliginosa 



Arrangement of the Species 



I. Stipitate species 1- 2 



II. Dimidiate, umbonate-sessile and reflexed species, many of which occur 

 resupinate. 



a. Hyphal layer not differentiated into an intermediate layer proper 



and a bordering, denser, dark zone on its upper side 3-7 



b. Hyphal layer differentiated into an intermediate layer and at 



least a bordering, denser, dark zone on its upper side. 



* Setigerous layer not more than 50 fi thick 8-10 



** Setigerous layer more than 50 fi thick 11-15 



c. No hyphal layer 16-17 



III. Resupinate species, none of which occur reflexed. 



a. Hyphal layer not differentiated into an intermediate layer proper 



and a bordering, denser, dark zone on the side towards the sub- 

 stratum. 



* Not stratose 18-20 



** Stratose 21-23 



b. Hyphal layer differentiated into an intermediate layer and at 



least a bordering, denser, dark zone on the side towards the 



substratum. 



Setigerous layer not more than 50 m thick 24-25 



Setigerous layer more than 50 /x thick 26-28 



c. No hyphal layer — setigerous layer seated directly on the sub- 

 stratum. No. 17 is nearly always resupinate. 



* Setae small, 27-45X4^-5 fi 29 



Both setae and colorless, incrusted cystidia present 30 



Setae larger than 27-45X4^-5 /i and not having cystidia. . 31-36 



IV. Dimidiate, somewhat flabellate species whose structure is not known. . . 37 



1. Hymenochaete damaecornis Link ex Leveille, Ann. Sci. 

 Nat. Bot. III. 5 : 151. 1846; Sacc. Syll. Fung. 6 : 589. 1888; 

 Massee, Linn. Soc. Bot. Jour. 27 : 96. 1890. Plate 16, fig. 1. 



Stereum damicorne Link, Ges. Naturforsch. Freunde Berlin 

 Mag. 3 : 40. 1809; Fries, Epicr. 546. 1838; R. Soc. Sci. Upsal. 

 Actis III. 1 : 109. 1851 ; Lloyd, Letter 46 : 6. 1913.— Thelephora 

 damaecornis Link ex Fries, Linnaea 5 : 524. 1830. — Eymeno- 



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