204 



[Vol. 7 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Bot. Jour. 25: 143. 1889. Corticium ephebium Berk. & Curtis, 

 Grevillea 1: 178. 1873; Sacc. Syll. Fung. 6: 618. 1888. 

 Peniophora ephebia (Berk. & Curtis) Massee, Linn. Soc. Bot. 

 Jour. 25: 151. 1889. Stereum neglectum Peck, N. Y. State 

 Mus. Rept. 33: 22. 1880. Peniophora neglecta Peck, N. Y. 

 State Mus. Rept. 40: 76. 1887. P. occidental^ Ellis & Ever- 

 hart, Torr. Bot. Club Bui. 24: 277. 1897; Sacc. Syll. Fung. 

 14: 224. 1900. Lloy delta occidentalis (Ell. & Ev.) v. Hohn. 

 & Litsch. K. Akad. Wiss. Wien Sitzungsber. 116: 791. 1907. 

 Stereum purpurascene Lloyd, Myc. Writ. 4. Letter 53: 14. 

 1914. 



Illustrations: Cooke, Grevillea 8: pi 122. f. 1879. 

 Type: in Herb. Schweinitz, Curtis Herb., and Kew Herb. 

 Fructifications coriaceous, often resupinate and effused, some- 

 times reflexed, with upper surface strigose-hairy, concentrically 

 sulcate, warm buff to pinkish buff, weathering 

 gray, often laterally confluent, the margin 

 entire; hymenium minutely bristly with the 

 cystidia, even, drying pinkish buff to drab; in 

 structure 400-600 m thick excluding the hairy 

 covering, with the intermediate layer composed 

 of longitudinally interwoven, thick-walled hy- 

 phae 4-4 J \x in diameter; cystidia large, in- 

 crusted, thick-walled, often brownish at the 

 base, conical, 100-150 X 12-20 At, emerging up to 

 40-70 m; spores white in spore collection, even, 

 10-12X6 11, somewhat flattened on one side. 



Resupinate portions 1-10 X 1-2 J cm.; reflexed 

 margin 2-8 mm. broad. 



On logs and fallen limbs of Ulmus, Tilia, 

 Robinia, Morus, etc. Canada to Texas, west- 

 ward to California, and in Mexico, Cuba, and 

 Brazil. Common. June to February. 

 Fully developed specimens of S. cinerascens may be recognized 

 by their narrowly reflexed, strigose-hairy pileus and hymenium 

 somewhat pruinose with the large, bristly, colorless cystidia. In 

 sectional preparations, these cystidia are usually slightly colored 

 at the base and more numerous and larger than in any other 

 North American Stereum; the spores are very large also. 



Fig. 36. 



S. cinerascens. 



Cystidium, c, and 



spores, s, X 488. 



