4-.6 mm. in width. This is plainly _Perichaena cano-flavescens_,
Raunkier. I do not find any threads of a capillitium in my specimens.

II. OPHIOTHECA, Currey. Plasmodiocarp terete and more or less elongated,
bent and flexuous, sometimes annular or reticulate, the surface not
polished or shining: the wall a thin membrane, with a thin outer layer
of minute scales and granules, irregularly dehiscent. Capillitium of
very slender loosely-branched threads, with the surface minutely warted
and spinulose. Spores globose, oval or somewhat irregular, yellow.

Distinguished from Perichaena by the terete plasmodiocarp and by the more
spinulose capillitium. _Cornuvia_ of Rostafinski.

1. OPHIOTHECA CHRYSOSPERMA, Currey. Plasmodiocarp globose or oblong to
elongated, and bent or flexuous, sometimes annular or branched and
reticulate, dull brown in color; the wall a thin yellowish membrane,
with a thin yellow-brown outer layer, irregularly dehiscent. Capillitium
of slender loosely-branched threads, 2-3 mic. in thickness, the surface
minutely spinulose. Spores subglobose, yellow, 8-9 mic. in diameter.

Growing on the inner surface of old bark of Quercus, etc. Plasmodiocarp
.4-.5 mm. in thickness, variable in length. _Cornuvia circumscissa_ of
Rostafinski's monograph.

2. OPHIOTHECA WRIGHTII, B. & C. Plasmodiocarp more or less elongated,
bent and flexuous, very commonly in small rings, from brownish-ochre to
brown or blackish in color, not polished; the wall a thin yellow
membrane, with a thin brown outer layer, irregularly dehiscent.
Capillitium of slender loosely-branched threads, 2-3 mic. in thickness,
furnished with numerous straight or bent long-pointed spinules. Spores
subglobose, yellow, minutely warted, 10-12 mic. in diameter. See Plate
I, Fig. 14.

Growing on the inside of bark of Acer, Carya, etc. Plasmodiocarp about
.5 mm. in thickness, variable in length, often in small rings 1-2 mm. in
diameter. The prickly threads are quite characteristic; the spinules are
3-5 mic. in length. _Hemiarcyria melanopeziza_, Speg., is evidently the
same thing.

3. OPHIOTHECA VERMICULARIS, Schw. Plasmodiocarp terete and more or less
elongated, bent and flexuous, sometimes annular or reticulate, the
surface not polished, brownish in color; the wall a thin yellow
membrane, covered on the outside by a more or less thickened brown layer
of scales and granules, irregularly dehiscent. Capillitium of slender
loosely branched threads, 2-3 mic.