Peck, _Rep. N. Y. Mus._, XXVI., p. 74.
1875. _Trichia contorta_ Rost., _Mon._, p. 259.

Sporangia gregarious, or crowded, small, ellipsoid or reniform, arcuate,
dark red brown, sessile; hypothallus none; capillitial mass ochraceous
or dull yellow, the elaters few, irregular, the spirals uneven,
irregular, often projecting and thin, though generally flat or obscure,
the apices more or less swollen, ending in a curved tip; spore-mass
concolorous, spores beneath the lens bright yellow, papillose, 10-12 mu.

This species resembles the preceding in color, but is of less aggregate
habit, and the sporangia are more plasmodiocarpous, reniform, arcuate,
etc. The capillitium is also distinctive, the sculpture irregular,
uneven with general lack of symmetry. Our description is made up from
specimens of _T. reniformis_ Peck, which appears to be the American form
of Rostafinski's species.

Rare. New York, Montana?

3. TRICHIA IOWENSIS _Macbr._

PLATE III., Figs. 3, 3 _a_, 3 _b_; PLATE X., Fig. 5.

1892. _Trichia iowensis_ Macbr., I_a., Bull. Lab. Nat. Hist._, II.,
p. 133.

Sporangia sessile, gregarious, spherical or reniform, with no
hypothallus, purple brown; spores and spore-mass yellow; elaters with
three or four spiral bands unevenly distributed, and with occasional
inflations, sparingly branched, spinulose, especially where inflated,
spinules long, 3-6 mu, recurved, often bifid or trifid, especially at or
near the acuminate tip; spores delicately warted, 9-11 mu.

This species occurs not rarely and is found on the bark of _Populus_, so
far, exclusively. The sporangia are inconspicuous until opening by
fissure they display the yellow spores and capillitial threads. The
species is immediately recognized by its elaters, whose numerous and
lengthened spinules are unlike those of any cognate form, reminding one
of the capillitium of _Ophiotheca_. Related to the two preceding, but
distinct by its spinulose capillitium.

Iowa, Missouri; Black Hills, South Dakota.

_Trichia andersoni_ Rex carefully described by Morgan, _Myx. Mi. Val._,
p. 38, belongs with this first group, four small species, the
inconspicuous. To the present writer in each the structure seems
distinct. In the herbarium a small bit of Anderson's material has rested
long; but it must not be lost to sight. The species is sure to be taken
again in the cool mountains, somewhere abundant; as these stretch from
Alberta to far Alaska. The capi