North American species of Mycena.

446 NORTH AMERICAN SPECIES OF MYCENA

evenly covered with a dense layer of cystidia (appearing pubescent
under a lens).
Spores 4-6.5 y, globose to subglobose, verrucose, yellowish in
iodine; basidia four-spored; pleurocystidia and cheilocystidia similar
and abundant, 40-90 X 8-12 p, fusoid-ventricose to nearly cylindric,
with a long neck and obtuse apex, smooth or somewhat incrusted;
gill trama homogeneous, yellowish in iodine, pileus trama homogeneous below a well-differentiated pellicle, yellowish in iodine,
numerous short hairlike branches arising from the cells of the hyphae
of the pellicle, producing a turflike surface covering, occasional cystidia also projecting from the pellicle.
Habit, habitat, and distribution.-Single to scattered on humus
under redwood, fall; California. Fairly abundant during one season.
Material studied.-Smith, 33-962, 218, 954, 3718, 3731, 3739,
3756, 3784, 3884, 9042, 10672, 10775.
Observations.-The details of the pellicle are very difficult to
ascertain even with the aid of an oil-immersion lens. However, the
turflike covering produced by the branches of the cells forming the
pellicle is readily visible under the usual magnifications. The cells
of the pellicle are not arranged in a palisade as in M. nodulosa and
are even less conspicuous. In age the slender projections forming
the turflike zone may collapse, and under such conditions the pellicle
does not appear at all distinctive. As Kiihner has suggested, the
presence of an incrustation on the cystidia and its location are not
valuable characters in this particular group of species. M. trachyspora is readily distinguished from M. bryophila by the absence of a
pseudorhiza. Ktihner has placed my specimens under M. bryophila.
After restudying them in the light of his conclusions, I find it impossible to agree that they represent only one species.
229. MYCENA NODULOSA A. H. Smith
Mycologia, 28:411. 1936
Illustrations:
Text fig. 54, nos. 5-7 (p. 444).
Smith, Mycologia, 28, fig. 3, 1-3.
Pileus 1-3.5 cm. broad, obtusely conic, becoming campanulate or
expanded and with a conic umbo, margin appressed against the stipe
when young, striate to the disc when moist, surface at first appearing
hoary because of numerous projecting cystidia (very finely pubescent