North American species of Mycena.

324 NORTH AMERICAN SPECIES OF MYCENA

Kauffman studied the Rock River collection when it was fresh; in his
notes he described both the cap and the stipe as glutinous and stated
that the fungus was a segregate of M. vulgaris. When revived in
KOH, the fruiting bodies of M. laevigata from Oregon have more
conspicuously gelatinous layers on their pilei and stipes than do those
on the Michigan specimens. They were not more than subviscid to
the touch when fresh.
Kiihner, recognizing that the Michigan specimens were very distinct from M. vulgaris, gave them a new name, M. pseudovulgaris.
However, he had not seen any fresh material. Therefore, since I
had seen both and did not place them together when I published on
M. laevigata (Smith, 1937), it was logical for him to assume that the
two were different. From my observations on various collections in
North America I would say that the color differences between American and European specimens do not appear to be of taxonomic importance.
My collections of M. laevigata from Ontario strongly resembled an
Omphalia in the manner in which the gills were attached. Additional
collections from the West Coast in 1937 clearly indicated, however,
that such a resemblance is not a constant character. M. semivestipes
frequently shows the same type of variation. In addition, I have
compared my specimens with material from the Union of Soviet
Socialist Republics sent to me by Dr. Rolf Singer. The cystidia,
spores, and pellicle of the pileus and the outer layer of the stipe tissue
are identical with those of my collection 8157 from Oregon. The
dried specimens are also strikingly similar.
157. Mycena semivestipes (Pk.), comb. nov.
Omphalia semivestipes Peck, Bull. Torr. Bot. Club, 22: 200. 1895.
Prunulus semivestipes Murrill, North Am. Flora, 9: 334. 1916.
Omphalia curvipes Peck, Bull. Torr. Bot. Club, 34: 345. 1907.
Prunulus curvipes Murrill, North Am. Flora, 9: 329. 1916.
Mycena subalcalina Atkinson, in Douglas, Am. Journ. Bot., 5: 37. 1918.
Illustrations:
Plate 74; Text fig. 40, nos. 6-7 (p. 320).
Hard, The Mushroom, Edible and Otherwise, fig. 91 (as M. alcalina).
Smith, Mycologia, 29: 351, fig. 2 b (as M. tintinnabulum).
Pileus 1-3.5 cm. broad, very obtuse to convex when young, the
margin usually incurved, becoming expanded and slightly umbonate,
convex or plane at maturity, occasionally the disc slightly depressed,