Sporangia gathered in clusters of four to eight, surmounting coalescent, or sometimes divergent stalks, rusty-brown, or pallid, the peridium evanescent above; the coalescing stalks forming, especially below, a clustered column, 2 mm. in height, equalling the sporangia, dull reddish-brown in color; capillitium of rigid, tubular, generally simple threads, attaching above by delicate tips, below by a broader sometimes branching base, sometimes conjoined near the peridial wall, now and then at irregular intervals inflated slightly or anon bulbose, roughened by projecting spinules, one-third the diameter, brownish or yellow; spores reddish-brown, faintly marked by reticulating bands over large part of the surface, 5-5.5 mu. This peculiar species looks at first very little like a myxomycete. The stiff projecting hairs of the capillitium are hyphal in appearance and under the lens recall the phycomycetes; but the spores and withal the general structure seem to claim recognition here. Rostafinski was inclined to make a trichia of it, because of the hair-like capillitium, and markings on the threads, Massee found indistinct spiral markings even, enough to suit at least the prototrichias. Mr. Lister would put it near the tubifers. Father Torrend thinks of the dianemas, margaritas, etc., because of simple capillitium attached above and below! Spore-characters are probably the index most reliable, and the partial reticulation suggests association with _Tubifera_ and for the present it may find station there, as in the English monograph. Rare. Collected three times: twice in Ceylon, once in Jamaica. By the courtesy of Dr. Farlow, late lamented, we record the western specimens. _D._ RETICULARIACEAE Fructification aethalioid; the sporangia sometimes poorly defined, intricately associated, borne on a common hypothallus and covered above by a common cortex; the lateral walls variously perforate and incomplete, form a pseudo-capillitium; spores umber or ochraceous. =Key to the Genera of the Reticulariaceae= _A._ Spores umber. _a._ Sporangia wholly indeterminate, their walls much consolidated below, fraying out above into long, slender threads, 1. RETICULARIA _b._ Sporangia bounded, more or less distinctly, by broad perforate plates throughout 2. ENTERIDIUM _B._ Spores ochraceous 3. DICTYDIAETHALIUM =1. Reticularia= (_Bull._) _Rost._ 1791. _Reticularia_ Bulliard, _Champ. de la France_, p. 95, in part. 1873. _Reticularia_ (Bulliard) Rost., _Versuch_, p. 6.