[Vol. 7 



128 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 





Stereum Micheneri Berk. & Curtis emend. Massee, Linn. Soc. 

 Bot. Jour. 27: 183. 1890. . Micheneri Berk. & Curtis, Gre- 

 villea 1: 162. 1873 (in part). See Ann. Mo. Bot. Gard. 1: 

 214. 1914. Corticium Nyssae Berk. & Curtis, Grevillea 1 : 166. 

 1873; Sacc. Syll. Fung. 6: 609. 1888; Massee, Linn. Soc. Bot. 

 Jour. 27: 120. 1890. C. siparium Berk. & Curtis, Grevillea 

 1: 177. 1873; Sacc. Syll. Fung. 6: 636. 1888; Massee, Linn. 

 Soc. Bot. Jour. 27: 139. 1890. 



Illustrations: Berkeley, Ann. & Mag. Nat. Hist. I. 1: 94. 

 pi 5. /. 45. 



Type: in Kew Herb, and Curtis Herb. 



Fructifications coriaceous-soft, rarely resupinate, usually more 

 or less broadly reflexed, upper surface tomentose, spongy, some- 

 times with projecting hairs 

 collapsed together into a 

 plane or wrinkled surface, 

 drying cartridge-buff to 

 cinnamon-buff, the margin 

 entire; hymenium even, 

 drying vinaceous-buff to 

 fawn color; in structure up 

 to 1-1$ mm. thick inclusive 

 of the tomentum, with the 

 intermediate layer on its 

 under side in the sub- 

 tly menial region, loosely 

 interwoven, and containing more or less numerous^ pyriform 

 vesicular bodies 15-30X10-20 /x; cystidia slender, thin-walled, 

 tapering hairs, not incrusted, 4-5 /* in diameter, protruding up 

 to 25 /x beyond the basidia; spores white in spore collection, 

 even, flattened on one side, 4^-6X2-3 ix. 



Resupinate specimens up to 6 cm. in diameter; reflexed por- 

 tion 1-2 cm. broad, 2-6 cm. laterally along substratum. 



On logs and stumps of Salix and other frondose species. 

 Ontario to Alabama, in Missouri, and in British Columbia to 

 Mexico; occurs also in Sweden, France, Italy, England, and 

 Japan. August to April. 



Stereum rugosiusculum is probably more frequent and more 

 widely distributed than shown by the specimens received, for 



m. 



Fig. 14. S. rugosiusculum. Section of hy- 

 menial region X 90; cystidium and basidia, 

 n, vesicular body, v, and spores, s, X 665. 



