1926] 



BURT — THELEPHORACEAE OF NORTH AMERICA. XV 307 



On bark of dead Salix lasiandra. Washington. November. 



The dried fructifications of A . helveolus have some resemblance 

 in aspect to those of Stereum rujuvi but swell on softening and 

 rise to a height of 2 mm. above the bark. The paraphyses were 

 described by Bresadola as ''paraphysibus irregularibus, undulato- 

 restrictis, moniliformibus, laevibus, 3-0 \l crassis, apice interdum 

 subcapitatis " but they do not show clearly in my preparation. 



Specimens examined: 

 Washington: Spokane, alt. 576 m., J. R. Weir, 16312, type (in 



Weir Herb.). 



A. macrodens Coker, Elisha Mitchell Scientif. Soc. Jour. 36: 

 155. pi. 15, upper figs., pi. 31, f. 7-9. 1921. 



Type: part of type in Mo. Bot. Gard. Herb. 



"Forming irregular, often somewhat elongated patches about 

 2 mm. to 2 cm. long with well-defined margins and with much 

 the aspect of A. candidus; surface minutely pulverulent, pure 

 white, or pale cream when old and weathered; entire thickness 

 only about 150-190 [jl, the structure in section much obscured by 

 very small crystals and the densely branched paraphyses. Ba- 

 sidia entirely embedded, 12-15 [x thick, irregular and bent, with 

 4 long, stout sterigmata, which only reach the surface by their 

 tips. Spores commonly rectangular in outline, the surface set 

 with a few large, irregularly placed, bluntly pointed spines which 

 are up to 4 [jl long; body of spore 113/^-15 X 183^-27 [x." 



On bark of living trees of Fraxinus and Salix. New Hampshire 

 to North Carolina. May to December. Probably common. 



"In passing the plant would be taken for A. candidus, but when 

 examined is seen to be much thinner with the closely pressed 

 margin not showing a dark underside. The spores are remark- 

 able and unlike any others in the genus." 



Specimens examined: 

 New Hampshire: Chocorua, W. G. Farlow, 1. 

 New York: Alcove, C. L. Shear, 1302, 1305; East Galway, E. A. 



Burt; Poughkeepsie, W. R. Gerard, 294, comm. by N. Y. Bot. 



Gard. Herb. 

 North Carolina: Chapel Hill, W. C. Coker, 4734, type, conmi. by 



Univ. North Carolina Herb, (in Mo. Bot. Gard. Herb., 57427). 



