1920] __ 



BURT — THELEPHORACEAE OF NORTH AMERICA. XII o7 



26. Spongy-soft, tomentose; cystidia 36-60X9-12/x; spores 5-9X3-4^; 



New York to Mexico 66. S. spumeum 



26. Bursting out from the bark, forming a gray hymenium and becoming 



reflexed, 1-2| mm. in diameter 67. S. erumpens 



26. Corky, rigid, concentrically sulcate, bister; hymenium ruddy, be- 

 coming zonate; cystidia 30-50 X8-12iu; spores 4-6X3-5m; on 

 hemlock and other conifers, Canada to Texas and westward to 

 the Pacific coast 68. S. sulcatum 



26. Tobacco-colored and sulcate above, with a horn-like crust under the 

 tomentum; hymenium whitish; cystidia 30-36 X7m; on oak, 



North CaroHna and Ohio to Mexico 69. S. subpileatum 



27. With aspect of S. subpileatum as given above, but hymenium contains numer- 

 ous and conspicuous bottle-brush paraphyses in addition to cystidia; 



Pennsylvania to Colombia 70. S. sepium 



27. With brown, velvety hymenium and a white margin; paraphyses fihform, 



colored; spores hyahne, 6-llX3-4^ju 71. S. albobadium 



27. With aspect of dark specimens of S. albobadium, but with thicker, zonate 



hymenium and imbedded spores colored; Oregon to Mexico 



72. S. heterosporum 



27. Becoming narrowly reflexed, fuscous, 2-10 mm. in diameter; hymenium 



velvety, bister; paraphyses colored, with bushy-branched tips; Canada to 



Alabama and Arkansas 73. S. versiforme 



28. Snuff-brown and sulcate above, tomentose; hymenium pruinose, 

 zoned, containing bottle-brush paraphyses; on oak, Florida and 

 Venezuela 7^. »S. insigne 



28. Fuscous, sulcate, not tomentose but with upper surface a horn-like 



crust, 2-3 mm. thick; Mexico 75. S. durum 



28. Woody, resupinate, crowded as if confluent and then broken into 

 frustules, 2-4 mm. in diameter, above black and crust-like; hyme- 

 nium pinkish buff to whitish and pruinose; on oak. . ..76. S. frustulosum 



28. Usually resupinate, coriaceous-soft; hymenium light yinaceous-purple 

 when young, becoming avellaneous, containing fihform paraphyses 

 with short lateral prongs; aspect of Coriiciwm evolvens; Canada to 

 North Carolina 77. S. roseo-carneum 



• I. Stereum caperatum (Berk. & Mont.) Massee, Linn. Soc. 

 Bot. Jour. 27: 161. 1890; Lloyd, Myc. Writ. 4. Stip. Stere- 

 ums, 17. textf. 631. 1913. Plate 2, fig. 1. 



Thelephora caperata Berkeley & Montagne, Ann. Sci. Nat. 

 Bot. III. 11: 241. 1849; Montagne, Syll. Crypt. 175. 1856; 

 Sacc. Syll. Fung. 6:523. 1888. 



Illustrations: Lloyd, loc. cii.; Engl. & Prantl, Nat. Pflanzen- 

 fam. (i: 1**): 124. f.H-J. 



Type: in Kew Herb. 



Pileus coracelous, infundibuliform, drying pinkish buff, the 

 upper side with elevated radial ridges and usually densely tomen- 

 tose with coarse fibers ; in structure 600-700 m thick, composed of 

 densely, longitudinally arranged, thick-walled, hyaline hyphae 

 8 M in diameter ; stem central or sometimes absent, with attach- 

 ment by a tomentose disk; hymenium pale pinkish buff, some- 

 what radially rugose, glabrous ; hair-hke cystidia not incrusted, 

 3-4| n in diameter, flexuous, often constricted near the outer end, 



