[Vol. 5 

 306 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



18. Tawny olive, not cracl^ed, up to 90 /i 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 7-9X3^ fi and by containing crystalline masses 12-15 n 

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



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

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

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

 in Jamaica 34' H. opaca 



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

 setae 36-45 X5-J )tt; 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 fi^ ^ v(**^ ^i^y,*-* 

 thick; setae abundant, 60-75X8-9 fi, starting m all parts of the P^^^^'^ai 

 fructification ; with general aspect of resupinate H. ruhiginosa 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. ; 'v>*^ 



* 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. rO^^- 



*Not stratose 18-20: '^'^^ 



** Stratose 21-23 /p-*^^^ 



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 fi thick 24-25 



** Setigerous layer more than 50 fi 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 fi and not having cystidia. . 31-36 ^. ^^^^ 



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



A>* 



' -^ 



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; E. Soc. Sci. Upsal. 

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

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



