[Vol. 7 



184 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Type: in Herb. Schweinitz and Curtis Herb. 



Fructification coriaceous, thin, small, effuso-reflexed, some- 

 times confluent along branches, often conical and attached by- 

 one side and the umbo and some- 

 times only by the umbo, the upper 

 side villose-tomentose, somewhat fur- 

 rowed, white, weathering gray; in 

 structure 200-300 \i thick below the 

 hairy covering, with intermediate 

 layer becoming bordered on the 

 upper side by a denser or colored 



Fig. 27. S. ochraceo-flavum. , , , , , T j 



Hymenium showing three cys- zone when old and Weathered, COm- 



tidia, x 488. posed of densely and longitudinally 



arranged, hyaline hyphae 3-4 m in 

 diameter; no colored conducting organs; hymenium even, 

 "yellow," becoming cream-bufT in the herbarium; cystidia not 

 incrusted, obtuse, 20-25X4-6 /*, protruding up to 15 m; spores 

 not found. 



Reflexed portion 3-5 mm. broad, and about as long; scattered 

 conical pilei 3-5 mm. in diameter. 



On dead branches of frondose species. Canada to Mississippi 

 and westward to Missouri, and in California and Mexico. 

 July to May. 



S. ochraceo-flavum may be recognized at sight by its small, 

 white, conical fructifications heavily clothed with long, soft 

 hairs and by its bright yellow hymenium. The non-incrusted 

 cystidia afford a good distinctive microscopical character for 

 separation of this species from very small specimens of S. sul- 

 phuratum. In specimens which have persisted beyond their 

 normal season of active growth, the upper side of the interme- 

 diate layer becomes hardened and pale golden. 



Specimens examined: 

 Exsiccati: Ellis, N. Am. Fungi, 17; Ell. & Ev., Fungi Col., 6; 



Ravenel, Fungi Am., 787; Ravenel, Fungi Car. 2: 31; 



de Thiimen, Myc. Univ., 10. 

 Ontario: Ottawa, J. Macoun, 2^2. 

 Vermont: Middlebury, E. A. Burt. 

 Massachusetts: D. W. Weis, comm. by C. G. Lloyd, 145 (in 



Mo. Bot. Gard. Herb., 56687); Cambridge, E. A. Burt; 



Magnolia, W. G. Farlow. 



