MITRICHIA LEIOCARPA (_Cke._) _Macbr._

1877. _Hemiarcyria leiocarpa_ Cke., _Ann. Lyc. Nat. Hist. N. Y._,
XI., p. 405.
1891. _Hemiarcyria varneyi_ Rex, _Proc. Phil. Acad._, p. 396.

Sporangia simple, obovate or pyriform, rarely almost globose, pallid,
with a stem of the same color, as long as the diameter of the
sporangium; spore-mass and capillitium concolorous, or with slight
ochraceous tint; capillitium forming a loose net, the tubes branching in
a reticulate manner; spirals three, thin, prominent, along the convex
sides of the tubes mixed with a few obtuse spines; spores globose, with
a thin membrane, 12-14 mu.

Such is the original description of this distinctly American species.
_H. varneyi_ Rex should differ in having spirals seven or eight, and
spore only 6.25 mu. Mr. Lister, who has compared types of both species,
declares them the same! The present writer has been unable to secure
authentic specimens.

Pennsylvania.

7. HEMITRICHIA INTORTA _List._

1891. _Hemiarcyria intorta_ Lister, _Jour. Bot._, p. 268.
1891. _Hemiarcyria longifila_ Rex, _Proc. Phil. Acad._, p. 396.
1894. _Hemitrichia_ intorta List., _Mycetozoa_, p. 176.

Sporangia gregarious, globose-turbinate or pyriform, golden-yellow,
stipitate; peridium thin, translucent, shining, opening at the summit
irregularly, leaving a funnel-shaped receptacle below; stipe dark red
brown, solid, rugulose; capillitium of threads sparingly branched, but
looped and doubled upon themselves and constantly intertwisted,
orange-yellow, 3-4 mu in diameter, with spirals four, sparingly
spinulose, even and regular, the longitudinal striae conspicuous; spores
in mass concolorous, under the lens yellow, delicately warted, globose,
9-10 mu.

Concerning this species, Dr. Rex says: "Externally this species
resembles _H. clavata_ Pers., and has probably often been mistaken for
it. The capillitium, however, in its structural details and habit of
growth, is widely different. The partial untwisting of the loops of the
capillitium by drying, after the rupture of the sporangium, causes it to
be projected and elongated sometimes two or three times the length of
the sporangium." Outwardly the open sporangium, by the projecting free
tips, reminds one of a trichia. The capillitium is like that of _H.
vesparium_, but less rough, and, of course, different in color.

Rare. Fairmount Park, Philadelphia; Ohio, Iowa.

8. HEMITRICHIA CLAVATA (_Pers._) _Ro