[Vor. 1 
146 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
KEY TO THE SPECIES 
Context «Мйе............... ЗР т т oe Pere у ОЕ 1. L. betulina 
Contest БОИ... аки токов еее sees 1 
1. Tubes оғ interspaces 1 mm. or more broad; lamelle usually not much anas- 
UT erence Soe eka eae ek ee е” 3. L. sepiaria 
1. Tubes or interspaces less than 1 mm. broad; lamell freely anastomosing. . . . . 
2. L. vialis 
т. L. betulina L. ex Fries, Epicr. Syst. Myc. 405. 1838. 
Agaricus betulinus L. Sp. Plant. 1176. 1753. 
Plant annual, sessile, often imbricate; pileus dimidiate, 2-5 
x 2-9 x 0.3-1 cm., coriaceous to somewhat corky, prevailing 
color grayish to brownish, marked with many narrow, multi- 
colored zones, tomentose; margin thin and acute; context white, 
usually not more than 1 mm. thick; hymenium usually lamellate 
but sometimes poroid, the lamelle coriaceous, about 1 mm. 
apart, 0.3-1 em. broad, white or whitish; spores globose, smooth, 
hyaline, 5-6 шіп diameter. 
On all kinds of dead wood of deciduous trees. Common. 
L. flaccida Fries as reported from Ohio is but a form of this 
species. The plant is well represented by Hard (Mushrooms 
f. 185-86), Lloyd (Photogr. pl. 14), and fairly well in Cooke, 
Illustrations pl. 1125. 
2. L. vialis Peck, Ann. Rept. N. Y. State Mus. 26: 67. 
1874. 
Dedalea pallido-fulva Berk. Hooker’s Lond. Jour. Bot. 
6: 322. 1847. 
Pileus annual, sessile, imbricate or single, dimidiate or lat- 
erally connate, 1-4 x 2-7 x 0.2-0.8 cm., coriaceous or corky, 
grayish brown to cinnamon-brown, often darker at the base, 
subtomentose to glabrous, azonate or subzonate, margin acute; 
context brown, floccose-fibrous to soft-corky, 1-4 mm. thick; 
hymenium more or less poroid or labyrinthiform, rarely decid- 
edly lamellate, pores or lamelle averaging 2-3 to a mm., 1-3 
mm. broad, concolorous with the surface of the pileus; spores 
cylindrical to elliptical, smooth, hyaline, 2.7—4 x 7-8.2 и. 
On dead wood of both deciduous and coniferous trees. Com- 
mon. 
The species was described from Ohio as Dedalea pallido- 
fulva Berk. and so reported by Morgan. 
