1915] 



BURT THELEPHORA.CEAE OF NORTH AMERICA. V 749 



Hole, Priestman's Eiver region, W A. Murrill, N. Y. Bot. 

 Gard., Fungi of Jamaica, 180, immature specimen. 



SEBACINA 



Sebacina Tulasne, L. R. and C, Ann. Sci. Nat. V. 15 : 223- 

 226. pi. 10. f. 6-10. 1872; Linn. Soc. Bot. Jour. 13:35. 1873; 

 Brefeld, Untersuch. Myk. 7:102-106. pi. 6. f. 22-26. 1888; 

 Patouillard, Essai Taxon. Hym. 24, 25. 1900 (with the exclu- 

 sion of section Hirneolina). Exidiopsis Brefeld, Untersuch. 

 Myk. 7:94. pi. 5. f. 20-22. 1S8S. Sty pella Moller, A., Bot. 

 Mitth. a. d. Tropfen. 8, Protobasidiomyceten 166. pi. 4. f. 6, 7. 

 1895. 



Fructification coriaceous, membranaceous or floccose, gela- 

 tinous, waxy or pulverulent, resupinate, with habit of Corti- 

 cium; basidia longitudinally septate, close together or scat- 

 tered, sometimes between bushy conidiophores ; spores color- 

 less, producing in germination a similar spore or a cluster of 

 conidia. 



The type species of the genus is Corticium incrustans Pers. 



Sebacina incrustans occurs sometimes on the ground and 

 incrusting herbaceous stems and various erect objects but is 

 often on decaying wood ; S. Helvelloides occurs on the ground 

 and incrusting erect objects ; S. chlorascens has been observed 

 incrusting the mossy bases of living trees ; the other species 

 have been recorded only on dead wood and bark. A few mem- 

 bers of this genus are thick and spongy and were originally 

 included in Thelephora; usually the species are thin and 

 Corticium-\ike in general habit and were in several instances 

 published under Corticium. In the dried conditions some 

 species of Sebacina may be tentatively recognized as such by 

 having the hymenial surface glassy or resembling dried carti- 

 lage ; but such a separation from Corticium is very uncertain, 

 for some species of Sebacina dry with a dull, soft surface and 

 some true Corticiums assume the appearance of dried carti- 

 lage in drying. 



It seems probable that it will always be difficult to deter- 

 mine resupinate species of Hymenomycetes ; it is not possible 

 to do so from the descriptions alone of the earlier botanists. 

 European authors have recently been enlarging such descrip- 



