Sporangia stipitate, the stipe extended as a columella, which entirely traverses the sporangium and forms at the apex an expanded disk; from this depends the capillitium. =Key to the Species of Enerthenema= _A._ Spores free 1. _E. papillatum_ _B._ Spores in clusters 2. _E. berkeleyanum_ 1. ENERTHENEMA PAPILLATUM (_Pers._) _Rost._ PLATE V., Fig. 3. 1801. _Stemonitis papillata_ Pers., _Syn._, p. 188. 1828. _Enerthenema elegans_ Bowm., _Trans. Linn. Soc._, XVI., p. 152. 1862. _Comatricha obtusata_ Preuss, Sturm, _Deutschl. Flora_, Pl. LXX. 1876. _Enerthenema papillatum_ (Pers.) Rost., _Mon. App._, p. 28. Sporangia scattered or crowded, stipitate, spheroidal, naked, black fuscous, above, shining, adorned with a minute, black papilla; stipe black, opaque, conical or attenuate upward, about equal to the peridium; columella at the apex expanded into a shining disk; capillitium springing from the lower side of the disk or from its edge, made up of scarcely forked threads which are free below; spores violaceous or fuscous black, minutely warted, 10-12 mu. Rare. Wisconsin, Ohio, South Carolina, Illinois, Pennsylvania, Iowa, Colorado. This is one of the few species so well marked that Persoon's description, _l. c._, is definitive: "Stylidio toto penetrante. Capillitium exacte globosum, sub-compactum, in eius apice stylidium papillae in modum prominet." For this reason Bowman's specific name _elegans_ is discarded. 2. ENERTHENEMA BERKELEYANUM _Rost._ 1876. _Enerthenema berkeleyanum_ Rost., _Mon. App._, p. 29. 1913. _Enerthenema syncarpon_ Sturgis, _Myxo. Col._, II., p. 448. This species corresponds to the preceding in all respects except in the fact that the spores are clustered in groups of four to twelve and are a little larger, 11-13 mu, strongly spinulose on the exposed surface. Dr. Sturgis reports this from Colorado, _l. c._, but discards Rostafinski's specific name on the ground that the type has disappeared; only the spores of some fungus hyphae remain in the place and these may have been mistaken by Berkeley. This seems hardly possible since such supposition would not account for the generic reference either by Berkeley (and Broome) or by Rostafinski. The description in the _Monograph_ is minute as that of one who had the form under his lenses. Rostafinski _saw_ Berkeley's specimens. For a similar case, see under _Prototrichia metallica, Mycetozoa 2nd ed._, p. 261. South Carolina, type; Colorado. =2. Clastoderma= _Blytt_ 1880. _Clastoderma_ Blytt, _Bot. Zeit._, XXXVIII., p. 343. Sporangium globose, distinct, stipitate; the columella short or obsolete; the capillitium of few sparsely branched threads, which bear at their tops the persistent fragments of the peridium, but are not otherwise united.