1926] 



BURT THELEPHORACEAE OF NORTH AMERICA. XV 257 



Fructifications long-effused, thin, closely adnate, not at all 

 separable, pale drab-gray, even, somewhat pruinose, becoming 

 cracked, the margin similar or whitish, thinning out; in section 

 150 ^ thick, colored buffy brown, composed of densely arranged, 

 interwoven, erect hyphae and gloeocystidia ; the hyphae about 

 3 \L in diameter, incrusted near the substratum; gloeocystidia 

 very numerous in all regions, usually flexuous, 40-50 X 8-12 \l, 

 but some 6-12 \l in diameter in the form of spherical brown 

 masses; spores hyaline, even, 4-6 X 3 \l few found and may not 

 belong. 



Fructification 10 cm. long, 1 cm. wide. 



On under side of small branches of Salix. Nebraska. Febru- 

 ary. Apparently local. 



C. argentatum has aspect so similar to Peniophora cinerea and 

 C. subcinerea that microscopic examination of sections is necessary 

 to separate it from these more common species. Distinguishing 

 characters are the silvery color externally and brown color within 

 and numerous gloeocystidia, some of which have the form of 

 brown spherical masses such as occur in Peniophora serialis. 



Specimens examined : 

 Nebraska: Long Pine, C. L. Shear, 1094, type. 



67. C. septentrionale Burt, n. sp. 



Type: in Mo. Bot. Gard. Herb. 



Fructifications broadly effused, adnate, thin, small pieces separ- 

 able when moist, drying snow-white, waxy, pulverulent, cracking 

 by wide fissures into rectangular masses about 3x2 mm., the 

 margin similar, composed of interwoven hyphae; in section 

 150-200 \k thick, not colored, composed of hyphae loosely arranged 

 below, suberect, bushy-branched, nodose-septate, 3-33^ \l in 

 diameter, not incrusted; gloeocystidia flexuous, up to 45 X 6 (x, 

 sometimes capitate or moniliform at apex, confined to the hy- 

 menial layer; spores hyaline, even, cylindric, 6-8 X 2-23^-3 \i y 

 not numerous; basidia with 4 sterigmata. 



Fructifications 5 cm. long, 2 cm. wide, broken off at both ends. 



On decaying, weathered, frondose wood. Alabama and Mani- 

 toba. October. 



Among the species having gloeocystidia C. septentrionale is 



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