40 NEW YORK STATE MUSEUM 
Pileus 2.5-3.5 cm broad; stem 5-8 cm long, 1-3 mm thick. 
Gregarious. Low ground under trees. Stow, Mass. September. 
S. Davis. 
This slender species closely approaches some species of Leptonia 
in general appearance. This character has suggested the specific 
name. The more or less decurrent lamellae throw the species into 
the genus Clitopilus. It differs from Clitopilus vilis Fr. 
by the color of the pileus and by its larger spores, and from 
C.subvilis Pk. by the color of the pileus and its squamulose 
center. In the dried state the pileus and stem are black and the 
margin of the pileus is sulcate striate. 
Pileus tenuis, conicus vel convexus, umbilicatus hygrophanus, 
centro umbilicoque squamulosus alibi glaber, udus,. castaneus, 
margine striatulatus, in umbilico ater; lamellae latae, late adnatae 
vel decurrentes, distantes, albae, demum incarnatae, interdum trans- 
verse venosae; stipes gracilis, aequalis, vel leviter seorsum attenu- 
atus, fibrillosus, rectus farctus cavusve, brunneus, basi abundante 
albo tomentoso; sporae subglobosae, angulares, uninucleatae, 10-12 
x 8-10 p. L' | eA 
Pileus 2.5-3.5 cm latus; stipes 5-8 cm longus; I-3 mm crassus. 
Coryneum effusum 
Forming thinly effused indefinite black patches on wood, mycelium 
subhyaline, sporophores slender, often flexuous and tapering down- 
ward, subhyaline, 12-30 » long; spores oblong or subfusiform, 
straight or slightly curved 2-septate when mature, the central cell 
black, the terminal cells subhyaline, one or both finally subtruncate, 
20-28 x 10-12 p, the central cell 10-12 yp long. 
Wood of western cottonwood, Populus occidentalis 
Rydb. Stockton, Kan. March. E. Bartholomew. 
Differs from typical species of Coryneum in forming no definite 
acervuli or subcutaneous erumpent heaps but in developing in 
effused patches on decorticated wood. 
Coryneum tenuiter effusum, in ligni superficiei areas atras in- 
definitas formans; sporae oblongae vel subfusiformae, rectae vel 
leviter curvae, in maturitate biseptatae, loculo centrale atro, ter- 
minalibus subhyalinis, saepe truncates, 20-28 x 10-12 yp, loculus 
centralis 10-12 pw longus. 
Diatrype tumidella 
Stroma orbicular, plane or convex, I-2 mm broad, surrounded 
by a black line which penetrates to the wood, erumpent and 
