1918] 
BURT—THELEPHORACEAE OF NORTH AMERICA. X 359 
Type: authentie specimen from Fries reported in Kew 
Herb. by Massee, loc. cit. 
Fruetifieations 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 џ thick, composed 
of densely interwoven hyphae 3 y in 
diameter, colored like the fructifica- 
. rugata. 
tion, and of very numerous setae 60— Section Ди young fructifica- 
10x 8-12 lis emerging up to 50 m tion, a, and ШТ frueti- 
я 2 fieation, b, X 
somewhat cylindric below, taper- 
ing above, distributed throughout the fructification; spores 
white in collection on slide, even, allantoid, 44-7 X 14-2 p. 
Very variable in size, ranging from 24X1 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, andin 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 44-7 14-2 u. 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 д. 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. 
