20. PHYSARUM RELATUM, Morgan, n. sp. Sporangium globose, the base umbilicate, stipitate, often cernuous; the wall a thin, violaceous membrane, rugulose and iridescent, covered with small, roundish or irregular white scales of lime. Stipe long, erect or inclined, rising from a thin hypothallus, tapering upward, white or cream color to ochraceous. Capillitium a dense net-work of tubules, more or less expanded at the angles, and almost entirely filled with white granules of lime, leaving only here and there short, slender empty spaces. Spores globose, nearly smooth, violaceous, 8-9 mic. in diameter. Growing on old wood. Sporangium .5-.6 mm. in diameter, the stipe about twice this length. The capillitium is rigid, with the abundance of lime almost as in the genus _Badhamia_. Superficially the species much resembles _Cytidium globuliferum_ or _Physarum compactum_, but the disposition of the lime on the wall and in the capillitium is altogether different. 21. PHYSARUM AURISCALPIUM, Cke. Sporangia subglobose, depressed, substipitate; the wall a hyaline membrane with a thin, closely adherent layer of minute granules of lime, over which are scattered large, irregular, orange-red scales of lime. Stipe very short, sometimes almost obsolete. Capillitium of tubules forming a loose net-work, with widely expanded angles, and mostly filled with orange granules of lime, only here and there short, slender, empty spaces. Spores globose, minutely warted, dark violaceous, 11-13 mic. in diameter. Growing on rotten wood; South Carolina, Ravenel. Sporangia .6-.8 mm. in diameter, the stipe very short. Described in _Annals of the Lyceum of Natural History of New York_, June, 1877. So fine a species ought to be found again. Cooke's specimen was examined by Lister, _Mycetozoa_, p. 61. EXPLANATION OF PLATE XIV. Fig. 56.--Craterium minimum, B. & C. _a._ Sporangia × 5. _b._ Sporangium with lid × 90. _c._ Capillitium and spores × 500. Fig. 57.--Craterium maydis, Morgan. _a._ Sporangia × 5. _b._ Sporangium × 90. _c._ Capillitium and spores × 500. Fig. 58.--Physarum obrusseum, B. & C. _a._ Sporangia × 5. _b._ Sporangium × 90. _c._ Capillitium and spores × 500. Fig. 59.--Physarum connexum, Link. _a._ Sporangia × 5. _b._ Sporangium × 90. _c._ Capillitium and spores × 500. Fig. 60.--Physarum polycephalum, Schw. _a._ Sporangia × 5. _b._ Sporangia × 90. _c._ Capillitium and spores × 500. Fig. 61.--Physarum lateritium, B. & C. _a._ Sporangia × 5. _b._ Sporangia × 90. _c._ Capillitium and spores × 500. Fig. 62.--Physarum imitans, Racib. _a._ Sporangia × 5. _b._ Sporangium × 90. _c._ Capillitium and spores × 500. Fig. 63.--Physarum relatum, Morgan. _a._ Sporangia × 5. _b._ Sporangia × 90. One divested of the wall and showing the rigid capillitium. _c._ Capillitium and spores × 500. [Illustration: The Journal of the Cin. Soc. Natural History. VOL. XIX. PLATE XIV. MORGAN ON MYXOMYCETES.] _B. Sporangia sessile._