1917] 
BURT—MERULIUS IN NORTH AMERICA 341 
1801.—Xylomyzon destruens Persoon, Мус. Eur. 2: 27. 1825. 
—Меги из vastator Tode, Halle Naturforsch. Ges. Abhandl. 
1; 351. pl. 2. f. 1, 2. 1788; > Syn. Fung. 497. 1801.-М. 
domesticus Falck in Moller’s H forsch. 6: 53-55. 
text f. 12. pl. 1-3, 8. 1912. 
Illustrations: Jacquin, loc. cit.; Boudier, Icones Mye. 1: 
pl. 165; Dufour, Atlas Champ. pl. 65; КІ. Dan. pl. 2026; Fries, 
Sy. Atl. Svamp. pl. 70; Gillet, Chang. Ет. Hym.; Krombholz, 
Abbild. und Beschr. pl. 46. f. 1, 2; Patouillard, Tab. Anal. 
Fung. f. 132; Falck in Moller’s Haniska forsch. 6: text 
f. 12. pl. 1-3, 8; Lloyd, Myc. Notes 44: 616. text f. 872. 
Fructifications large, resupinate, effuso-reflexed or produ- 
cing stalked tubercules from a medial placenta, thick, spongy- 
fleshy, moist, yellow-ferruginous, drying Brussels-brown to 
warm sepia, the margin tumid, tomentose, white; hymenium 
with folds large, porose, and gyrose-dentate, the pores about 
1-2 mm. in diameter and of the same depth 
or half as deep; in structure ranging from 2 0 
to 10 mm. thick, consisting mostly of the layer <> O 
bearing the hymenium—this layer composed Fig. 25 
of densely arranged, interwoven, nodose- М. lacrymans. 
septate hyphae, of which some are colored like 51 pl. 21, f. 2h. 
the spores, thick-walled, 5—6 д in diameter, 
and the others are hyaline, 4-44 џ in diameter, and occur 
between the colored hyphae and gradually predominate 
towards the hymenium; no cystidia; spores warm sepia in a 
spore collection, citron-yellow under the microscope, even, 
9-103 54-6 и, somewhat flattened on one side. 
Fructifications large, 8-15 cm. in diameter, up to 1 em. or 
more thick when growing. 
Under side of coniferous logs in woods, usually under floors 
and timbers in buildings and very destructive to wood. 
Canada and Connecticut, westward to Arizona. June to Janu- 
ary. Rare. 
The distinguishing characters of M. lacrymans are its very 
large, thick, fleshy fructifications and its hymenium which 
dries rust-colored—nearly Brussels-brown—and is either 
somewhat regularly porose with large and rather deep pores 
