North American species of Mycena.

232 NORTH AMERICAN SPECIES OF MYCENA

brous, shining, white, 2.5 cm. long, scarcely 1 mm. thick. The entire
hymenophore changes to pale-lilac on drying.
"Type collected by W. A. Murrill on the ground in mixed woods
just east of Gainesville, Fla., Oct. 29, 1938 (F 18379). A rare species,
springing a surprise by its entire change of color."
Through the kindness of Dr. Murrill I have been able to examine
a small portion of the type. The details of the tramae of the pileus
and gills could not be made out clearly, but neither of the tissues was
amyloid. No pleurocystidia or cheilocystidia were observed. The
basidia were four-spored. Spores were abundant, measured 5-6 X
3-3.5 u, were narrowly ellipsoid and very distinctly amyloid. The
systematic position of this species is a puzzle to me. Because of the
amyloid spores and the pale-avellaneous pileus it appears to be close
to M. subfusca, but it is readily distinguished from all in this group
by the change in color in drying. This change may indicate a relationship to the Adonidae or the Calodontes.
106. MYCENA SABALI Murrill
Mycologia, 8: 221. 1916
Prunulus Sabali Murrill, North Am. Flora, 9: 325. 1916.
llustrations: Text fig. 12, nos. 3-5 (p. 142).
"Pileus convex, scarcely umbonate, not fully expanding, solitary,
1 cm. broad; surface glabrous, rugose, striate, dry, pale-luteous,
slightly darker on the disk: lamellae adnate, subdistant, narrow,
white: stipe cylindric, glabrous, smooth, white, pubescent at the
base, 3 cm. long, 1 mm. thick.
"Type collected on a dead petiole of a dwarf palmetto in City
Park, New Orleans, Louisiana, September 6, 1908, F. S. Earle 77
(herb. N. Y. Bot. Gard.).
"Distribution: Known only from the type locality."
Observations.-I have examined the type and made the following
observations: The spores measure 8-11 X 5-6 u, are smooth, subellipsoid, and amyloid. Both two- and four-spored basidia were.seen. The pleurocystidia and cheilocystidia, which are abundant,
are broadly fusoid with acute apices and smooth. Many have a
highly refractive granular-appearing content similar to those of
M. erubescens. The surface of the pileus is characterized by the
presence of thin-walled pilocystidia 30-100 X 8-10,. These are