1917] 
BURT—MERULIUS IN NORTH AMERICA 343 
28. M. aureus Fries, Elenchus Fung. 1: 62. 1828; Hym. 
Eur. 592. 1874; Sace. Syll. Fung. 6: 415. 1888. 
M. vastator Fries, Syst. Мус. 1: 329. 1821, but not of Tode. 
Illustration: Fl. Dan. pl. 2027, f. 2 super. 
Type: authentie specimen unknown to me. г 
Fructification resupinate, effused or sometimes effuso- 
reflexed with a narrowly reflexed margin, membranaceous, 
soft, cottony next the substratum and on upper side of the 
reflexed portion, readily separable, margin and upper surface 
of pileus drying buff-yellow; hymenium drying ochraceous 
orange to russet, radiately plicate-porose, Er 
gyrose-crisped, the folds about 1-1 mm. apart, 22 4 
with the radiate or longitudinal folds the more Fig. 26 
prominent at first and towards the margin, : : 
the edges thin and acute; in structure 300-400 „Spores Х 87). 
pl. 21, f. 25. 
и thick, with the folds standing out up to 1 
mm. more, composed of loosely interwoven, nodose-septate 
hyphae 21-4 и in diameter; spores cylindric, even, 3-44 13-2 
и, very pale, slightly colored and concolorous with Ше basidia 
and hyphae in lactic acid preparations, yellowish in a spore 
collection; no cystidia. 
Fructifications small, often laterally confluent, usually 
about 4 cm. broad and 1 em. long. 
On decaying pine wood. Canada to North Carolina and 
westward to Montana and Arizona. August to November. 
Apparently rare. 
M. aureus is well characterized by its small, nearly circular, 
yellow fructifications, with margin along the upper side occa- 
sionally free or slightly reflexed, golden yellow hymenium, 
and small, cylindric spores whose color is so slight as likely 
to be disregarded unless seen in the mass in spore collections. 
Specimens examined: 
Exsiccati: Ellis, N. Am. Fungi, 508; Romell, Fungi Exs. 
Seand., 119. 
Sweden: Stockholm, L. Romell, in Romell, Fungi Exs. Seand., 
119; Femsjó, С. С. Lloyd, 09125 (in Lloyd Herb.). 
Austria: Trento, G. Bresadola. 
Canada: Billings Bri, J. Macoun, 52 (in N. Y. Bot. Gard. 
