The remarkable shape of the sporangium and the peculiar regularity of the surface net, the lateral columella, all combine here to warrant the erection of a distinct species. Dr. Rex referred this to _S. baeuerlinii_ Mass. At that time he had not the author's description, and had seen only a very poor fragment received with notes in a letter. Mr. Massee's description makes it immediately evident that whatever other affiliations _S. baeuerlinii_ may have, by description it has at least none with _S. fenestrata_ nor with our northern form of _S. splendens_. Massee's species is described as having the "mass of spores black", the capillitium with "branches springing from the columella; the main branches more and more numerous, thicker and irregular towards the apex of the sporangium, and often form irregular flattened expansions":--etc. This suggests some form of _S. dictyospora_ Rost.: see under our No. 5. Possibly for such reasons Lister referred it to _S. splendens_ Rost., which as we have just seen, was undoubtedly regarded by the author as a form of the _fuscous_ group. The long, slender, simple columella is not only lateral, but occupies indeed the sharp vertical angle of the triangular, prismatic sporangium. Furthermore, the sporangium is at maturity strangely twisted, so that the columella in its ascent accomplishes one or more spiral turns. In forms collected by Dr. Rex, which seemed to him most nearly to agree with Massee's species, the inner capillitium is somewhat abundant, but the character of the columella just the same. Pennsylvania, Ohio, Kansas, Colorado, Iowa; India! 11. STEMONITIS SMITHII _Macbr._ 1893. _Stemonitis smithii_ Macbr., _Bull. Lab. Nat. Hist. Ia._, II., p. 381. 1894. _Stemonitis microspora_ List., Morg., _Jour. Cin. Soc._, p. 54. 1911. _Stemonitis ferruginea_ var. _smithii_ Lister, _Mycetozoa, 2nd ed._, p. 150. Sporangia in small clusters, close-packed and erect, not spreading, bright ferruginous prior to spore dispersal, cylindric, stipitate, of varying height; stipe jet-black, shining, about one-third the total height; hypothallus generally well developed; columella black, gradually tapering, at length dissolving in capillitial threads and net some distance below the diminished plumose apex; capillitium of fuscous threads, the inner network of abundant, sparingly united branches uniformly thickened, the surface net very delicate, composed of small, regular, polygonal meshes, the peridial processes few; spore-mass bright ferruginous, spores by transmitted light pale, almost colorless, smooth, 4-5 mu. The species as thus constituted includes forms varying in size from 2.5-3 mm. only. The common form heretofore known everywhere in America as _S. ferruginea_ is from 10-15 mm. high. The _type_ to which the specific name _S. smithii_ was originally applied is 2.5 mm. high and rejoices in smooth, almost colorless spores, 4-5 mu.