70 
Mycologia 
arcuate, adnexed, white at first, then pale-flesh-color; stem equal 
or slightly tapering upward, slender, hollow, glabrous, mouse- 
gray, becoming blackish in drying, often with white mycelium at 
the base; spores incarnate, angular, uninucleate, apiculate, 8-io 
X 6—7 /A. 
Pileus 1-2 cm. broad; stem 2-4 cm. long, 1-1.5 mm. thick. 
In a wood road. Stow, ^Massachusetts. August. S. Davis. 
Pileus tenuis, membranus, hemisphaericus convexus vel sub- 
planus, minute papillatus, demum umbilicatus, subscaber, hygro- 
phanus, humidus striatulus, siccus striatus, in juventate nigres- 
cente-brunneus, in senectute pallidor ; lamellae ascendentes vel 
arcuatae, adnexae, primum albae, deinde pallide incarnatae ; 
stipes aequalis vel deorsum leviter attenuatus, gracilis, fistulosus, 
glaber, murinus, in siccatate nigrescens, saepe basi albido mycelio ; 
sporae incarnatae, angulares, uninucleatae, apiculatae, 8-10 
X 6—7 /A. 
Leptonia validipes 
Pileus thin, membranous, convex, slightly depressed in the cen- 
ter or subumbilicate, fragile, minutely squamulose, dark-gray or 
grayish-brown ; lamellae thin, close, entire on the margin, ad- 
nate, white and smooth becoming pink and dusted by the spores ; 
stem stout but fragile, pruinose above, flexuous, hollow, some- 
times twisted, often bent at the base, pale-violet-gray above, white 
below with white mycelium at the base; spores angular, apiculate, 
uninucleate, 10-12 X 6-8 yu. 
Pileus 2-3 cm. broad ; stem 3-6 cm. long, 2-3 mm. thick. 
Gregarious. On humus in swamps. Stow, Massachusetts. 
August. S. Davis. 
This may possibly prove to be a large stout-stemmed form of 
Leptonia gracilipes Pk. but the description of the collector attrib- 
utes no striations to the pileus of the fresh plant. This would 
afford a ready mark of distinction between the two species. 
Pileus tenuis, membranus, convexus, in centro leviter depressus 
vel subumbilicatus, fragilis, minute squamulosus, nigrescente 
griseus vel griseo-brunneus ; lamellae tenues, confertae, aciei in- 
tegrae, adnatae, albae glabraeque, deinde incarnatae ; stipes validus, 
fragilis, supra pruinosus, flexuosus, fistulose, aliquando contortus, 
saepe basi recurvus, supra pallide griseo-violaceus, infra albus, 
basi album mycelium ; sporae angulares, apiculatae, uninucleatae, 
10-12 X 6-8 /A. 
