North American species of Mycena.

GLUTINIPES: CAESPITOSAE

407

"Pileus 1-3 cm. latus. Stipes 6-8 cm. longus. Sporae ellipsoideae 6-8 X 3.5-4 iu. Ad truncos, dense caespitosa, Oviedo Fla.
Cystidia rara, parva, acuta.
"This seems to be a very distinct species. It was found at Oviedo
Fla., growing in dense masses on old logs. The plants are pure white
and both pileus and stipe are very viscid, and both have a tough,
gelatinous cuticle, which can easily be stripped off entire. The pileus
is convex, and striatulate to the depressed center. The lamellae
appear adnate at first but soon seem more or less arcuate decurrent.
It could easily be considered an Omphalia, but in-so-much as several
species of Mycena which are closely related to this plant are abnormal
for Mycena in the same way it has seemed best to place this species
with them."
Habit, habitat, and distribution.-Growing in dense masses on old
logs; Florida.
Material studied.-Beardslee, December, 1932, Florida. Murrill,
September 17, 1938, Florida.
Observations.-The original account is quoted above. The following observations were made from a cluster of fruiting bodies sent to
me by Mr. Beardslee: The pellicle on both the pileus and the stipe
is easy to demonstrate in sections revived in KOH. The basidia
are very small, 14-16 X 4-5 /, and four-spored. Pleurocystidia are
scattered, measure 32-48 X 6-192 t, and are rather variable in shape.
Some are ventricose, with a rounded cylindric neck ending in a
rounded apex, and are furnished with a long contorted base; others
are narrowly fusoid, with a sharp-pointed apex and the base not at all
or only slightly elongated. In some of either type one or two obtuse
rodlike projections occur near the apex. The cheilocystidia are of
two types. They are either similar to the pleurocystidia or basidiumlike, with the apex slightly roughened or of irregular outline. Those
of the latter type are more difficult to locate, since they are embedded
in the gill edge. The subhymenium is distinctly gelatinous. The
floccose portion of both the pileus and the gill trama turns dark reddish brown in iodine and the spores dark blue. Numerous metallic
lactiferous hyphae were observed in the tissue of the stipe.
206. MYCENA AUSTINI (Pk.) Ktihner
Encyc. Myc., 10: 394. 1938
Agaricus (Omphalia) Austini Peck, Ann. Rep. New York State Mus., 28:
48. 1876.
Omphalia Austini Saccardo, Syll. Fung., 5:336. 1887.
Omphalopsis Austini Murrill, North Am. Flora, 9: 312. 1916.