North American species of Mycena.

EUMYCENA: TYPICAE

293

branched, giving rise to two or several contorted fingerlike projections;
pleurocystidia not differentiated; gill trama dark vinaceous brown in
iodine; pileus trama with a thick adnate pellicle, beneath it a region
of inflated cells irregularly arranged (the hypoderm), their contents
dark brown, the remaining tissue filamentous, all except the pellicle
vinaceous brown in iodine.
Habit, habitat, and distribution.-Gregarious to subcespitose under
hardwoods, particularly maple and basswood, from June to October;
North Carolina, Massachusetts, New York, and Michigan. Rare in
North America.
Material studied.-Smith, 5036, 6259. Atkinson 10225, Blowing
Rock, North Carolina, and various collections from New York.
Observations.-The cheilocystidia, colors of the pileus, cartilaginous
consistency, and striate stipe distinguish M. polygramma. M. vitilis,
M. pullata, and M. praelonga have probably all been misidentified as
M. polygramma in North America because of the striations occasionally present on their stipes. M. vitilis is quickly distinguished by its
cystidia; M. pullata, by its color; and M. praelonga, by its habitat on
sphagnum. M. megaspora is also very close to M. polygramma, but is
readily distinguished by its much larger spores and generally smooth
stipe or by having fibrils only toward the base. It is also distinguished by its cystidia. These are the usual clavate-roughened type
with numerous short rodlike projections over the apices. The cheilocystidia of M. polygramma are somewhat intermediate between the
smooth and the roughened types. Both species have the same stature, colors, consistency, sordid-reddish stains in age, and welldeveloped pseudorhiza. The stipes of M. polygramma may be glabrous and polished in off-season forms, and these are indistinguishable
macroscopically from carpophores of M. megaspora.
STIPE LONG; CHEILOCYSTIDIA ROUGHENED
142. MYCENA MAGNA Murrill
Mycologia, 8: 220. 1916
Prunulus magnus Murrill, North Am. Flora, 9: 338. 1916.
Illustration: Text fig. 34, no. 7 (p. 289).
"Pileus very large for the genus, broadly convex, not fully expanding, gregarious to subcespitose, reaching 5 cm. broad; surface dry,
glabrous, striate, avellaneous, slightly darker on the disk when dry: