1829. _Stemonitis ferruginea_ Ehr., Fries, _Myc._ III., p. 158, Syn. excl. 1899. _Stemonitis axifera_ (Bull.) Macbr., _N. A. S._, p. 120, in part. 1904. _Stemonitis flavogenita_ Jahn, _Abh. Bot. Ver. Brandenb._, XLV, p. 265. 1911. _Stemonitis flavogenita_ Jahn, List., _Mycetozoa, 2nd ed._, p. 149. Sporangia cylindric, obtuse, closely fasciculate, "cinnamon brown," stipitate, 5-7 mu; stipe short, black, columella ceasing abruptly below the apex; capillitium a loose net-work with many broad expansions; the peridial net very delicate, the meshes small but uneven, 6-15 mu, with many projecting points; spores pale ferruginous, verruculose, 7-9 mu. This is _S. ferruginea_ Ehr. of Fries with its plasmodium yellow. Fries says "flavicat," _becomes_ yellow, if one may follow the analogy of corresponding Latin verbs of color, so that the record of color-changes in the present species is yet to be recorded. Until further experience may advise to the contrary, we may assume that all stemonites cinnamon-brown in color, with widened columella-tip, and pale yellowish spores 7-9 mu in diameter, have at some time in their history a yellow plasmodium, and accordingly represent in America the new-found species. The larger spores, and, the strange proliferate development of the columella-tip, to which Miss Lister has happily called attention, constitute the essential diagnostic features here. Our only specimens so far are from Oregon. 14. STEMONITIS PALLIDA _Wingate._ PLATE XIII., Fig. 3 1897. _Stemonitis pallida_ Wing., _N. A. F._, Ell. and Ev., No. 3498. 1899. _Stemonitis pallida_ Wing., Macbr., _N. A. S._, p. 123. 1911. _Stemonitis pallida_ Wing., List., _Mycetozoa, 2nd ed._, p. 149. Sporangia gregarious, or somewhat clustered, erect, cylindric obtuse, short, blackish brown, rubescent, becoming pallid, stipitate; stipe short, black, polished, rising from a thin, brown, or iridescent hypothallus; columella percurrent, ceasing abruptly at the apex; capillitium filling the interior with abundant branches which form at the surface a close-meshed net, little developed above, making the apex very blunt; spores in mass, dark brown, by transmitted light dusky, nearly smooth, 7.5 mu. This species is well recognized at sight, among the fuscous forms, by its scattered, erect habit. In color it is not unlike _S. fusca_, but has an added reddish tinge. In form it is peculiar by virtue of the blunt rounded apex which seems to be a constant character. The spores under moderate lens are perfectly smooth, under the 1-12 they present very delicate low scattered papillae. Rare; eastern part of United States. 15. STEMONITIS CAROLINENSIS _Macbr._ PLATE XIII., Fig. 5.