1918] 



BURT THELEPHORACEAE OF NORTH AMERICA. X 359 



Type: authentic specimen from Fries reported in Kew 

 Herb, by Massee, loc, cit. 



Fructifications resupinate, widely effused, closely adnate, 

 cracked into small 4-6-sided areas, sometimes grumous, drying 

 from cinnamon-brown to bister and 

 Rood's brown and sometimes weath- 

 ered to mouse-gray, the margin thin- 

 ning out and sometimes paler; in 

 structure 150-500 n thick, composed 

 of densely interwoven hyphae 3 /x in 

 diameter, colored like the fructifica- g- c^fi^jgata. 



tion, and of very numerous setae 60- Section of young fmctifica- 

 70x8-12 /x, emerging up to 50 /z, ^^^,^1'^ ^l^'xls"'"'' '""""''' 

 somewhat cylindric below, taper- 

 ing above, distributed throughout the fructification; spores 

 white in collection on slide, even, allantoid, 4^7x1^-2 a*- 



Very variable in size, ranging from 2jXl cm. to 20x7 cm., 

 sometimes much larger. 



Very common on dead fallen limbs and trunks of frondose 

 species, such as beech, maple, birch, and alder, rarely on conif- 

 erous wood. Canada to Texas and westward to Ohio and 

 Kentucky, and in Jamaica. July to April. 



The distinguishing characters of H. corrugata are its closely 

 adnate fructification, which cracks into small, polygonal areas 

 about 1-3 to a mm. and sometimes scales off, distribution of 

 the rather stout setae throughout the whole very dense fruc- 

 tification from substratum to hymenium, and white, allantoid 

 spores about 4^-7x11-2 /x. American collections of H. corru- 

 gata have a broader range in color than the European collec- 

 tions cited below. H. insularis Berk, is based upon a specimen 

 Rood's brown in color, with whitish margin, orbicular form, 

 and thickness of 160 /*. I have tried to regard H. insularis as 

 a distinct species but it intergrades too completely in all its 

 characters with typical H, corrugata. H. episphaeria (Schw.) 

 is very near H corrugata but is less cracked, extremely thin, 

 and has most of its setae starting conspicuously on a dark de- 

 limiting zone next to the substratum. 



