North American species of Mycena.

98 NORTH AMERICAN SPECIES OF MYCENA

Habit, habitat, and distribution.-On fallen twigs of Sequoia sempervirens; December 2, 1935, Orick, California. Known from the
type locality, Prairie Creek State Park.
Material studied.-Smith, 3720.
Observations.-Although the spores are amyloid and the gills foldlike, the species does not appear to be congeneric with Delicatula integrella. The development is altogether different. The young fruiting
bodies of D. integrella are characterized by the presence of a veil, and
the development of the hymenium is at least hemiangiocarpic. In
M. paucilamellata the development appears to be gymnocarpic.
There are no traces of a veil. My study of the latter was made from
freehand sections of fresh material and an examination of the whole
button stages under the low power of a microscope as well as under
a hand lens.
Mycena paucilamellata is very well characterized by its long,
narrow amyloid spores and smooth obtuse ventricose cystidia as well
as by its minute size and foldlike gills. It was found in great quantity, but, as one can readily imagine, the fruiting bodies make very
poor herbarium specimens when dried.
30. Mycena litoralis, sp. nov.
Illustrations: Text fig. 6, nos. 9, 11 (p. 85).
Pileus 2-4 mm. latus, campanulatus vel cuspidatus, glaber, subrugulosus, striatus, candidus; lamellae distantes, plicatae vel angustae, decurrentes, albidae; stipes 1 cm. longus, 0.5 mm. crassus,
fragilis, albidus, demum candidus, pruinosus; sporae 6-8 (9) X 3-4 t,
ellipsoideae; cheilocystidia 24-32 X 8-11 J, fusoide ventricosa. Specimen typicum in Herb. Univ. Mich. conservatum. Legit A. H. Smith,
n. 3470, prope Siltcoos Outlet Forest Camp, Florence, Ore., Nov.
14, 1935.
Pileus 2-4 mm. broad, campanulate or cuspidate, the umbo very
prominent, surface moist and watery, shining white, somewhat rugulose around the disc, otherwise even, glabrous, distantly translucentstriate when moist, opaque and becoming sulcate when faded, margin
appressed against the stipe at first, not discoloring, flesh thin, white,
fragile, taste mild, no odor; lamellae distant, veinlike or very narrow,
decurrent, hymenial tissue forming a collar on the stipe for some
distance down, edges even, whitish; stipe 1 cm. long, 0.5 mm. thick,
equal, fragile, translucent-white, soon opaque and shining white,