North American species of Mycena.

414 NORTH AMERICAN SPECIES OF MYCENA

33-403, 33-514, 33-771, 123, 414, 533, 1052, 4585, 5074, 6243, 6300,
6399, 7236, 7587, 7658, 9340, 9539, 10153, 10405, 15083, Michigan,
October 1, 1931; September 6, 1932; June 5, 1941. Atkinson, eleven
packets. Ellis and Everhardt, North American Fungi no. 3506.
Hesler, 10410. Kauffman, Kentucky, New York, Michigan. Kelly,
1077, 1678, 1702. Mains, 5068. Oakes, July 20, 1922. Overholts,
869, 925, 1534, 1535, 4278, 4563, 9851, 11070. Povah, FP 14, FP
258, Fl. 150. Wehmeyer, 568, 568a.
Observations.-Beardslee and Coker pointed out that pleurocystidia as well as cheilocystidia are present. Both types have been
found on all collections in the University of Michigan Herbarium.
The gelatinous subhymenium is not always readily demonstrable in
water mounts of fresh material but shows up well in sections revived
in KOH. The mycelium is often orange, but tends to fade where
exposed to light. The species is not closely related to Heliomyces,
as has been suggested, at least no more so than Hygrophorus laetus
or other Mycenae with gelatinous subhymenia.
211. Mycena lilacifolia (Pk.), comb. nov.
Agaricus lilacinus Peck, Ann. Rep. New York State Mus., 24: 63. 1872.
Agaricus lilacifolius Peck, ibid., 29: 66. 1878.
Omphalia lilacifolia Peck, ibid., 45: 94 (34). 1893.
Omphalina lilacifolia Murrill, North Am. Flora, 9: 346. 1916.
Clitocybe lilacifolia Singer, Lloydia, 5: 105. 1942.
Pileus 8-25 mm. broad, broadly convex with a flattened disc and
an incurved margin when young, in age with a flattened or somewhat
depressed disc, the margin usually remaining sloped abruptly downward (as in a truly conic species, thus causing the cap to be helmetshaped), surface glabrous, viscid to glutinous, translucent-striate,
"Naples yellow" on the disc, "cream color" toward the margin (bright
to pale yellow), buttons often dull lavender but quickly changing to
yellow, odor and taste not distinctive; lamellae "pale lilac," gradually
becoming pallid or retaining a lilac tinge, subdistant to moderately
close, 23-26 reach the stipe, two tiers of lamellulae, narrow (2 mm. -),
unequally decurrent, at first arcuate to subdecurrent, edges even; stipe
1-3 (4.5) cm. long, 1-2.5 mm. thick, equal or the base slightly enlarged, tubular, cartilaginous-fragile, glabrous, slimy-viscid, concolorous with gills when very young, lower portion soon becoming
yellow but the basal mycelium remaining lilac, in age pallid above or
with a persistent lilac tint.