North American species of Mycena.

MURRILL'S SEMITROPICAL SPECIES 4

457

The type consists of a single very small fruiting body. A small
portion was sectioned, and the spores were found to measure 7-8 X
4 u. They were ellipsoid instead of globose. Spherical spores were
found in the mount along with one-celled brown spores and others
which were muriform and had blackish-brown walls. The hyaline
ellipsoid spores occurred along the hymenium in groups of four, and
from this I assume that they were produced on the basidia. No
differentiated sterile organs were seen, and the pileus trama did not
revive well enough to be studied. Iodine reactions were not taken.
MYCENA FUMOSIAVELLANEA Murrill
Mycologia, 8: 220. 1916
Prunulus fumosiavellaneus Murrill, North Am. Flora, 9: 340. 1916.
Illustrations: Text fig. 55, nos. 5-6 (p. 451).
"Pileus minute, delicate, conic to campanulate, gregarious, 4 mm.
broad, 5 mm. high; surface glabrous, striate, avellaneous with a
fumosous tint, margin entire, pallid, appressed when young: lamellae
adnate, distant, broad, white: spores globose, smooth, hyaline, 5 -7.5 /: stipe very slender, equal, smooth, whitish-pulverulent, about
2 cm. long.
"Type collected on dead wood at Chester Vale, Jamaica, 900 -1200 m. elevation, December 21-24, 1908, W. A. & Edna L. Murrill
310 (herb. N. Y. Bot. Gard.).
"Distribution: Known only from the type locality."
The spores of the type measure 8-9 (10) X 5-6 pz and are broadly
ellipsoid, strongly amyloid, and smooth. The basidia are mostly
two-spored and measure 18-20 X 7 it. The cheilocystidia are clavate
to filamentous, roughened with short rodlike projections or the apices
covered with contorted fingerlike processes, hyaline and gelatinous in
age. The pileus is covered with a gelatinous pellicle 50-75, thick,
the tissue beneath it is vinaceous brown in iodine, the subhymenium
is not gelatinous but the gill edges gelatinize appreciably. The stipe
is surrounded by a thick outer layer of gelatinous hyphae.
The examination of the microscopic characters of the type has
revealed certain discrepancies between the specimens and Murrill's
description. The spores are not globose. The error was very likely
caused by the large number of immature spores found in mounts.
These appear globose unless one is careful to orient them properly.
The drawings (text fig. 55, no. 5 [p. 451]) were made from spores