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 Perichæna 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. in thickness, the surface with minute warts and ridges. Spores subglobose, yellow, 10-12 mic. in diameter. Growing on the inside of old bark. Plasmodiocarp about .4 mm. in thickness and various in length; in my specimens the sporangia are mostly small rings. The species looks exactly like _Ophiotheca Wrightii_, but the character of the threads is quite different.