[Vol. 7 



128 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 



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

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

 villea i: 162. 1873 (in part). See Ann. Mo. Bot. Card, i: 

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

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

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

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

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



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

 pi. 5. /. 45. 



Type: in Kew Herb, and Curtis Herb. 



Fructifications coriaceous-soft, rarely resupinate, usually more 

 or less broadly refiexed, 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- 

 hymenial 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 11 in diameter, protruding up 

 to 25 IX 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; refiexed 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 



n^ 



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

 menial region X 90; cystidium and basidia, 

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



