Sporangia gregarious, metallic blue with brilliant iridescence, globose, stipitate; stipe white, short, tapering upward; hypothallus white, venulose, a network supporting the snowy stipes; columella white, cylindric, passing the centre, obtuse; capillitium lax, of slender, anastomosing, brown, translucent threads; spores in mass black, by transmitted light dark-violaceous, very coarsely warted, 7-10 mu. This is perhaps the most showy species of the list. The globose brilliantly iridescent sporangia are lifted above the substratum on snow-white columnar stalks; these are again joined one to another by the pure white vein-like cords of the reticulate hypothallus. The plasmodium may spread very widely over all sorts of objects that come in the way, dry forest leaves and sticks, or the fruit and foliage of living plants. Closely resembling the preceding, but differing in the globose sporangia, it may be instantly recognized under the lenses by its coarsely papillate spores. Not common. New York, Pennsylvania, Ontario, Ohio, Iowa, Nebraska. 3. DIACHAEA SUBSESSILIS _Pk._ 1879. _Diachaea subsessilis_ Pk., _Rep. N. Y. Mus. Nat. History_, XXXI., p. 41. 1894. _Diachaea subsessilis_ Pk., Lister, _Mycetozoa_, p. 92. Sporangia gregarious or closely crowded, small, about .5 mm., dull iridescent-blue, greenish-gray, etc., globose or depressed-globose, short-stalked or nearly sessile; stipe generally very short, reduced sometimes to a mere persistent cone, white; columella obsolescent or reduced to white conical intrusion of the stipe; capillitium radiating from the stipe, brown, consisting of branching, anastomosing threads, paler at the tips; hypothallus very scanty or none; spores minutely warted, the papillae arranged in an irregular, loose net-work, violet-brown, paler under the lens, 10-12 mu. This species is easily recognizable by its diminutive size and generally defective structure; i. e. it has the appearance of a degenerate or depauperate representative of some finer form. Besides the type, yet to be seen in Albany, Dr. Sturgis reports the species from Connecticut and from the Isle of Wight! A small gathering is before me from Colorado. Every sporangium is borne upon a calcareous pedicel, very short indeed, but real. The _var. globosa_ referred to in the English text under _D. leucopodia_ has not appeared so far as reported, on this side the sea, but even such variety could scarcely in the hands of a collector take the place of the form now under consideration. Specimens of _D. subsessilis_ from Europe correspond remarkably with those described by Drs. Peck and Sturgis. Mr. Lister would have our species a synonym for _Lamproderma fuckelianum cracovense_ (Rost.) Cel. Rare; from Connecticut to Colorado. 4. DIACHAEA BULBILLOSA (_Berk. & Br._) _List._