North American species of Mycena.

102 NORTH AMERICAN SPECIES OF MYCENA

but soon becoming wrinkled; flesh membranous, odor and taste not
recorded; lamellae lacking; stipe 10-15 mm. long, filiform, hyaline
white, pruinose, scarcely enlarged at the base and with only a few
mycelial hairs at the point of insertion on the substratum.
Spores 10-13 (14) X 4-5 (6) A, cylindric to subcylindric, smooth,
hyaline, amyloid; basidia four-spored; margin of the pileus and apex
of stipe studded with saccate to clavate sterile cells, 19-40 X 9-27 g,
with the enlarged portion echinulate; the tissue of the stipe and
pileus remaining hyaline in iodine; trama of pileus composed of enlarged cells, the surface hyphae more or less covered with rodlike
projections, pellicle, if it exists, very rudimentary.
Habit, habitat, and distribution.-Gregarious on old rhododendron
leaves; Grassy Patch, Great Smoky Mountains National Park,
Tennessee. The old leaves are frequently found more or less curled
up on the forest floor, and the agaric usually fruits inside these curledup leaves.
Material studied.-Smith, 9848.
Observations.-The spores were very abundant both in mounts of
fresh material and also when revived in chloral hydrate to obtain
the iodine reaction. It would not be in the least surprising to come
upon specimens with gills and to find the gill edges furnished with
cheilocystidia similar to the echinulate sterile cells described above.
The characters that should be emphasized are the type of sterile cells,
the very large cylindric spores on four-spored basidia, and the purewhite color of all parts.
34. MYCENA MINUTULA (Pk.) Saccardo
Syll. Fung., 5: 263. 1887
Agaricus (Mycena) minutulus Peck, Bull. Buffalo Soc. Nat. Sci., 1: 47. 1873.
Prunulus parvulus Murrill, North Am. Flora, 9: 323. 1916.
Mycena parvula Murrill, Mycologia, 8: 221. 1916.
"Gregarious, white throughout, pileus campanulate, becoming
convex, smooth, striatulate, with a minute shiny umbo or apiculus
at the apex; lamellae broad, subdistant, attached with a slight decurrent tooth; stem slender, hollow, smooth, about 1' high, 2"-3"
broad, stem -" thick. On bark of a prostrate maple or basswood
trunk in hardwoods, Portville. Sept.
"A very small white species distinguished by the apiculus, the
interspaces are slightly reticulate. Viewed carefully in a certain