1873. _Didymium bulbillosum_ Berk. & Br., _Jour. Linn. Soc._, XIV., p. 84. 1898. _Diachaea bulbillosa_ Lister, _Jour. Bot._, XXXVI., p. 165. 1911. _Diachaea bulbillosa_ Lister, _Mycetozoa, 2nd ed._, p. 119. Sporangia gregarious, globose, small, iridescent purple, stipitate; stipe conical, white, sometimes brown, half-a-mm., half the total height; columella clavate, white or brown; capillitium of purple-brown threads united to form a lax net; spores violet-grey, marked with scattered warts "6-8 in a row across the hemisphere", 7-9 mu. Java, _Berkeley & Broome, op. c._ Toronto, Canada; cited here by courtesy of Miss Currie who gives the spores 7.8 mu. 5. DIACHAEA THOMASII _Rex._ PLATE V., Fig. 6, 6 _a_. 1892. _Diachaea thomasii_ Rex, _Proc. Phil. Acad._, p. 329. Sporangia gregarious, more or less crowded, purple and bronze, iridescent, globose sessile or short stipitate; stipe, when present, very short, thick, tapering rapidly upward, orange; hypothallus orange, prominent venulose, continuous; columella ochre yellow, rough, cylindric, tapering upward to one-half the height of the sporangium, obtuse; capillitium lax, of slender brown rigid threads, radiating from the columella in every direction, anastomosing to form a loose, large-meshed network; spore-mass brown; spores by transmitted light violaceous, minutely, unevenly warted, 10-12 mu. The peculiar orange color of the calcareous deposits in stipe and columella easily distinguish this species. The capillitium is also distinctive, rigid, simple, and comparatively scant, lamprodermoid. Rex calls attention to the fact that under low magnification the spores appear spotted; but the spots are occasioned simply by the closer aggregation, at particular points, of the ordinary papillae. A southern species. All the specimens so far reported are from the mountains of North Carolina. The specimens referred to under this name by Lister, _Mon._, p. 92, as coming from "Kittery, U. S. A." (Kittery, Maine?), are, no doubt, according to Mr. Lister's figures, _Comatricha caespitosa_ Sturgis. See under that species. _C._ LAMPRODERMACEAE Sporangia distinct, generally gregarious, more or less spherical; capillitium developed chiefly or solely from the summit of the columella. =Key to the Genera of the Lamprodermaceae= _A._ Columella percurrent; capillitium from a disk at the apex 1. ENERTHENEMA _B._ Columella scarce reaching the centre of the sporangium. _a._ Capillitium not forming a net 2. CLASTODERMA _b._ Capillitium forming an intricate net 3. LAMPRODERMA _c._ Minute, capillitium rudimentary 4. ECHINOSTELIUM =1. Enerthenema= _Bowman_ 1828. _Enerthenema_ Bowman, _Trans. Linn. Soc._, XVI., p. 152.