[Vol. 12 

 298 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Specimens examined: 

 Canada : locality not given, J. Macoun, 57, type. 



74. P. tenella Burt, n. sp. 



Type: in Mo. Bot. Gard. Herb, and Farlow Herb. 



Fructifications effused, white, tender, thin, loosely attached, 

 separable when moistened, velvety, setulose with the large 

 cystidia, the margin indeterminate, thinning out; in section 

 150-200 \l thick, not colored, composed of a dense hymenial 

 layer 75-90 y. thick, borne on a loosely interwoven layer composed 

 of thin-walled, hyaline hyphae 3-4 (i in diameter, nodose-septate, 

 sometimes granule-incrusted; hymenial layer composed of basidia, 

 gloeocystidia, and incrusted cystidia; gloeocystidia numerous, 

 flexuous, tapering from the base, 45-75 X 5-8 \i; cystidia very 

 large, heavily incrusted, conical, 60-100 X 15-20 n, wholly im- 

 mersed, or protruding beyond the basidia up to 75 {x; spores 

 copious, hyaline, even, 7^-9 X 3-4 [l. 



Fructifications 1-2 cm. in diameter. 



On coniferous bark. New Hampshire and Massachusetts. 

 September and October. Rare. 



P. tenella is distinguished from P. pubera by occurrence on 

 coniferous, rather than frondose, substratum, by being so loosely 

 attached to the substratum that small portions needed for sec- 

 tioning may be separated from the substratum when moistened, 

 and by the loosely interwoven hyphal layer equalling or exceeding 

 in thickness the hymenial layer and containing no gloeocystidia 

 nor cystidia. 



Specimens examined : 

 New Hampshire: Chocorua, W. G. Farlow, type (in Mo. Bot. 



Gard. Herb., 7617). 

 Massachusetts: Cambridge, A. P. D. Piguet, comm. by W. G. 



Farlow, 30. 



75. P. duplex Burt, n. sp. 

 Type: in Burt Herb. 



Fructifications small, effused, thin, adnate, somewhat mem- 

 branaceous, small pieces separable when moistened, becoming pale 

 pinkish buff in the herbarium, even, not cracked, not shining, the 



