North American species of Mycena.

114 NORTH AMERICAN SPECIES OF MYCENA

vinaceous brown in iodine; pileus trama with a thin pellicle the
hyphae of which bear numerous short projections; tramal body
vinaceous brown in iodine and composed entirely of greatly enlarged
hyphal cells; stipe tissue deep vinaceous brown in iodine.
Habit, habitat, and distribution.-Scattered to gregarious on bases
of hardwood trees, old nut husks, pieces of pine bark, and other debris
on the forest floor, usually late in the fall during cold weather, not
abundant; New York and Michigan.
Material studied.-Smith, 39-490, 32-501, 32-553, 32-599, 32-618,
32-627, 32-631, 32-661, 33-890, 66, 66a, 80, 80b, 1260, 4440, September 18, 1931, Michigan. Atkinson, 13801, 13942. Mains, 32-272.
Observations.-M. mirata is one of the species very frequently
neglected by the collector because of its small size and the lack of
sufficient fruiting bodies to make a worth-while collection. Its cystidia and spores, along with the small size, are its most outstanding
characters. The colors vary greatly, depending on the amount of
available light. Carpophores in deep shade are nearly always paler
than those in open areas. Sometimes the cap is white except for a
fuscous central eyespot.
Some difficulty will very likely be experienced in distinguishing
M. capillaris from M. mirata. If the two-spored forms are compared,
the shape of the spores and particularly their width will serve to
distinguish them at once. Since the four-spored form of M. mirata
has not been reported, no comparison of it can be made with the fourspored form of M. capillaris. I have examined the type of M. mirata
and found the microscopic characters to be as given in the description.
When growing in the open, M. mirata has a very strong tendency to
develop numerous white-strigose hairs at the base of the stipe; in fact,
this is so pronounced that the base often appears decidedly echinulate.
As pointed out under M. capillaris, that species, when fruiting in
the open, is inserted onto the substratum by a naked base.
42. MYCENA SUPINA (Fr.) Gillet
Les Hym6n., p. 279. 1874
Agaricus supinus Fries, Syst. Myc., 1: 142. 1821.
Illustrations:
Plate 10 B; Text fig. 8, nos. 5-6 (p. 111).
Lange, Flora Agar. Dan., 2, pl. 57 D.
Smith, Am. Journ. Bot., 22, pl. 3, fig. 4.