"Plasmodium pink"; sporangia sometimes flat-hemispheric, more often ill-defined, united in irregular, depressed, netted plasmodiocarps, generally dull brown; peridium opaque, didermatous, capillitium of simple or rarely branching filaments, variously beaded or marked with spiral bands, lightly attached at either end, occasionally twisted together; spore-mass dull brown, the spores in clusters of four or more, colorless by transmitted light, more or less verruculose, ellipsoidal, about 8-10 mu. Our specimens are from the mountains of Alberta. A curious, flat plasmodiocarp, an inch or more in length. It suggests _Hemitrichia serpula_ prematurely dry. 3. DIANEMA ANDERSONI, _Morg._ _Dianema andersoni_, _Morg._ MS., _non. pub._ Sporangium globose, sessile or sub-stipitate, seated on a thin brownish hypothallus; the wall a thin smooth pinkish membrane, when dry rugulose and iridescent, the inner surface somewhat thickened below and brownish at the base. Capillitium arising out of the thickened base, the threads hyaline or pinkish, ascending, flexuous, simple, or branched a time or two, the extremities attached on all sides to the wall of the sporangium. Spores globose, very minutely warted, pale, pinkish, 10-11 mu, in diameter, free. Growing on old wood and bark of _Alnus_; British Columbia, _W. B. Anderson_. Sporangium spherical, 6-8 mm. in diameter, sessile or on a very short stipe. This species differs from D. harveyi Rex in the _uniform pinkish_ color of the wall and of the spores; the dividing threads are furnished remotely with minute roundish tubercles as in _Didymium_; the spores are somewhat larger than in _D. harveyi_. _B._ PERICHAENACEAE =Key to the Genera of the Perichaenaceae= _A._ Sporangia more or less plasmodiocarpous in type, terete; dehiscence irregular 1. OPHIOTHECA _B._ Sporangia more or less polygonal in outline, or round, depressed; dehiscence circumscissile 2. PERICHAENA =1. Ophiotheca= _Currey_. 1869. _Ophiotheca pallida_ Berk. & C., _Jour. Linn. Soc._, X., p. 350. Fructification generally plasmodiocarpous, terete, bent or flexuous, often annular or cornuate, rarely globose, opening irregularly, peridium thin, not polished, covered more or less strongly with a distinct layer of scales or granules; capillitium of slender, loosely branching filaments, the surface rough to strongly spinulose; spores yellow. As a generic name _Ophiotheca_ plainly has priority. _Cornuvia_ as understood by Rostafinski has no representative so far in our region. =Key to the Species of Ophiotheca= _A._ Plasmodiocarp usually upon herbaceous stems, slender 1. _O. vermicularis_ _B._ Plasmodiocarp on rotting bark, logs, etc, _a._ Pale brownish or yellowish 2. _O. chrysosperma_ _b._ Chestnut brown or blackish 3. _O. wrightii_ 1. OPHIOTHECA VERMICULARIS (_Schw._) _Macbr._