1920] 



BURT THELEPHORACEAE OF NORTH AMERICA. XII 105 



pallida in Persoon's 'Icones et Descriptiones Fungorum' already- 

 cited. Our specimens and that from Bresadola have the 

 hymenium distinctly setulose with hair-like cystidia. Some of 

 the specimens in Kew Herbarium under the name of Thelephora 

 Sowerbeyi have hair-like cystidia, but these organs are few or 

 absent in whole sections from other specimens. The original 

 specimen of Helvella pannosa from Sowerby in Berkeley Her- 

 barium at Kew has hair-like cystidia. I concluded that these 

 cystidia are variable in abundance in English specimens and 

 that Thelephora Sowerbeyi and Helvella pannosa as represented 

 by the specimen from Sowerby should be kept with Thelephora 

 pallida. Although the specific name pannosa of Sowerby was 

 at first adopted by Fries, this was dropped later when Berkeley 

 found this species, as understood by Sowerby, to be based upon 

 a mixture of two species which were separated as Thelephora 

 Sowerbeyi and T. multizonata; T. pallida has priority over T. 

 Sowerbeyi. 



S. pallidum may be distinguished from T. Willeyi forms of S. 

 diaphanum by its occurrence in small concrescent clusters, by 

 short villose or tomentose stem, and by thicker pileus with upper 

 surface split radially into stiff straight fibrils. 



Specimens examined: 

 Austria: G. Bresadola. 

 England: from Sowerby, under the name Helvella pannosa (in 



Kew Herb.); Cornwall, C. Rea, 1 (in Mo. Bot. Gard. Herb., 



56241); Hereford, Mrs. Wynne (in Kew Herb., under the 



name Thelephora Sowerbeyi). 

 Vermont: Brattleboro, C. C. Frost (in Univ. Vermont Herb.); 



Grand View Mountain, E. A. Burt. 

 Connecticut: Waterbury, C. C. Hanmer, 1191. 

 North Carolina: Blowing Rock, G. F. Atkinson, comm. by 



Cornell Univ. Herb., 4192. 



16. S. elegans (Meyer) Lloyd, Myc. Writ. 4. Stip. Stereums, 

 24. textf. 589. 1913. (Not S. elegans of earlier authors.) 



Plate 3, fig. 15. 



Thelephora elegans Meyer, Fl. Essequeboensis, 305. 1818; 

 Fries, Syst. Myc. 1 : 430. 1821; Epicr. 545. 1838. (But here 

 abridged in an important respect so that following authors 

 modified the description to apply to more common species). 



