1834. _Physarum vermicularis_ Schw., _N. A. F._, No. 2296. 1869. _Ophiotheca pallida_ Berk. & C., _Jour. Lin. Soc._, X., p. 350. 1873. _Ophiotheca umbrina_ Berk. & C. Grev., II., p. 88. 1876. _Perichaena pallida_ (Schw.) Rost., _Mon. App._, p. 34. Plasmodiocarp very slender, terete, elongate, flexuous or reticulate, annular, etc., of dull gray or neutral tint; the peridium thin, translucent, but with a delicate granular outer coating; capillitium of slender threads, frequently branched, warted and usually minutely spinulose; spore-mass ochraceous yellow; spores by transmitted light pale yellow, minutely roughened, 10 mu. Perhaps common, but seldom collected, probably overlooked on account of protective coloration; the color is about that of the habitat, the weathered surface of dead herbaceous stems and roots. On dead corn stalks not infrequent. Differs from other species of the genus in having smoother capillitium, for which reason Rostafinski calls the present species _Perichaena vermicularis_. _O. pallida_ Berk. & C. seems to us to be the same thing, _N. A. F._, 726. New England, New Jersey, South Carolina, Ontario, Ohio, Iowa. 2. OPHIOTHECA CHRYSOSPERMA _Currey_. 1854. _Ophiotheca chrysosperma_ Currey, _Quart. Mic. Jour._, II., p. 240. 1875. _Cornuvia circumscissa_ (Wallr.) Rost., _Mon._, p. 290. 1911. _Perichaena chrysosperma_ Lister, _Mycetozoa, 2nd ed._, in part, p. 248. Plasmodiocarp elongate, bent and curved in various ways, spherical, more rarely annular or even reticulate, yellowish or ochraceous brown, opening irregularly; peridium thin, with yellowish outer layer; capillitium rather abundant, of threads slender, sparingly branched and minutely but distinctly spinulose; spore-mass yellow, spores by transmitted light pale, almost smooth, about 8 mu. Occurs on the inner bark of deciduous trees, especially of oak. Not common. This is possibly _Cornuvia circumscissa_ (_Wallr._) of Rostafinski's monograph; but it is doubtful to what Wallroth referred. Rostafinski's other citations are equally uncertain. Currey's figures and description alone merit recognition. Ohio, Iowa, Tennessee; Canada. 3. OPHIOTHECA WRIGHTII _Berk._ PLATE II., Figs. 7, 7 _a_, 7 _b_. 1868. _Ophiotheca wrightii_ Berk. & C., _Jour. Linn. Soc._, X., p. 349. 1876. _Cornuvia wrightii_ (Berk. & C.) Rost., _Mon. App._, p. 36. 1892. _Cornuvia wrightii_ (Berk. & C.) Macbr., _Bull. Lab. Nat. Hist. Ia._, II., p. 122. 1911. _Perichaena chrysosperma_ Lister, _Mycetozoa, 2nd ed._, p. 248.