e* 



[Vol. 13 

 308 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



A. subcruentatus (Berk. & Curtis) Burt, Mo. Bot. Gard. Ann. 

 7: 237. 1920; Zeller, Mycologia 14: 179. 1922. 



Stereum subcruentatum Berk. & Curtis, Am. Acad. Arts & Sci. 

 Proc. 4: 123. 1858; Sacc. Syll. Fung. 6: 567. 1888. 



Type: in Farlow Herb. 



Fructifications small, sometimes effuso-reflexed, with the re- 

 flexed portion up to 1-2 mm. broad but more frequently resupin- 

 ate, somewhat discoid, with the margin free all around and 

 slightly elevated in one fructification grown out so as to be 

 attached by the vertex; upper side of reflexed pileus whitish at 

 the margin, avellaneous nearer the substratum, somewhat radi- 

 ately rugose, mealy; hymenium even, white or becoming pinkish 

 buff; pulverulent; in section 500-1000 p. thick, not colored, com- 

 posed of suberect, densely interwoven hyphae among a great 

 amount of obscuring crystalline and mineral matter which is 

 often in masses up to 45 X 15 |&; hyphae about 2 pi in diameter; 

 hymenial portion up to 600 |i thick, composed of several layers, 

 containing more or less numerous imbedded spores resembling 

 the basidiospores; paraphyses simple, filiform, probably torulose, 

 about 2-3 \i in diameter, basidiospores copious at surface of 

 hymenium, hyaline, even, somewhat flattened on one side, 12- 

 18 X 9-12 tx. 



Fructifications 2-15 mm. in diameter. 



On bark of Tsuga Sieboldii in Japan and on bark of living 

 trunks of Picea sitchensis and Douglas fir in California and Ore- 

 gon. August and September. 



A. subcruentatus has hymenial surface and spores suggestive of 

 A. disciformis but is a very distinct species by having its fructi- 

 fications effuso-reflexed when on the bark of standing trunks, by 

 occurrence on conifers, thick and zonate hymenial portion, and 

 presence of imbedded spores. 



Specimens examined : 

 Oregon: Corvallis, S. M. Zeller, 1809 (in Mo. Bot. Gard. Herb., 



56330). 

 California: Requa, W. H. Snell (Mo. Bot. Gard. Herb., 55860) 



and E. E. Hubert, comm. by J. R. Weir, 9946 (in Mo. Bot. 



Gard. Herb., 56229). 

 Japan: C. Wright, 265, type, Fungi U. S. Pac. Expl. Exp. (in 



