O Stipe when present black + Globose, small .5 mm. 6. _B. affinis_ ++ Larger, spores strongly spinulose 7. _B. macrocarpa_ +++ Discoidal or annulate 8. _B. orbiculata_ OO Stipes membranous yellowish + Stipes long, sporangia iridescent 9. _B. magna_ ++ Stipes short or none; iridescent 10. _B. foliicola_ _c._ Sporangia grey, spores adherent i. Stipe when present yellowish + Wall iridescent, spores uniformly marked 11. _B. utricularis_ ++ More calcareous, spores strongly marked on one side 12. _B. capsulifera_ +++ Colorado, spores anon barred 13. _B. populina_ ii. Stipe when present black 14. _B. papaveracea_ _d._ Sporangia brown, lilacine i. Sessile 15. _B. lilacina_ ii. Stipitate, columellate 16. _B. rubiginosa_ 1. BADHAMIA OVISPORA _Racib._ 1884. _Badhamia ovispora_ Racib., _Myx. Ag. Cracov._, XII., p. 72. Sporangia sessile depressed-globose or plasmodiocarpous, white or ochraceous, covered by dense calcareous scales; capillitium white, the lime-granules sometimes aggregate at the center to form a pseudo-columella; spores not adhering, brownish-purple ellipsoidal, 8 x 10-10 x 15 mu. Reported from Bohemia, England, Pennsylvania. 2. BADHAMIA VERSICOLOR _Lister_. 1901. _Badhamia versicolor_ List., _Jour. Bot._, XXXIX., p. 81. 1911. _Badhamia versicolor_ List., _Mycetozoa 2nd ed._, p. 35. Sporangia scattered or clustered, minute, .3-.5 mm., grey or flesh-colored, sessile, the calcareous deposits slight; capillitium white or apricot-colored; spores ovoid, 8 x 10-9 x 12 mu, clustered, purplish, and warted at the broader end, elsewhere colorless and smooth. This little species, as it comes to us, is grey, very uneven in size, .2-.5 mm. and generally irregular in form and habit, perhaps scarce mature. The capillitium is white, physaroid. The spores furnish the distinguishing character. Sometimes globose, about 9-10. They are most of them definitely and permanently affected in shape by the fact of cluster-association, narrower in the direction of the cluster center. The indications are that these may become globose with maturity. Colorado,--_Bethel_; Scotland. 3. BADHAMIA DECIPIENS (_Curtis_) _Berk._ 1848. _Physarum decipiens_ Curtis, _Am. Jour. Sci._, VI., p. 352. 1873. _Badhamia decipiens_ Berk., _Grev._, II., p. 66. 1873. _Physarum chrysotrichum_ Berk. & C., Grev. II., p. 66. 1876. _Badhamia chrysotricha_ (Berk. & C.) Rost., _App._, p. 4.