The Myxomycetes of the Miami Valley, Ohio. 



i7 



bent or curved at the apex, longitudinally rugulose, brown or 

 blackish at the base, becoming paler upward and cinereous or 

 whitish at the apex. Capillitium of very slender threads, 

 rising from the base of the sporangium, forming a net-work 

 with much elongated meshes, scarcely expanded at the angles ; 

 the nodules of lime white or yellow, ellipsoidal or fusiform, 

 often very small and few in number, sometimes rather large 

 and numerous. Spores globose, very minutely warted, viola- 

 ceous, 8-10 mic. in diameter. 



Growing on wood, bark, mosses, etc. A very common 

 species. Sporangium .4-. 5 mm. in diameter, the stipe 1-2 

 mm. in length, the lime-nodules commonly not thicker than 

 the spores, but sometimes from once to twice their diameter. 

 Under this name I have included all the lenticular species of 

 Persoon's Synopsis, % Physarum nutans, P. luteum, P. viride 

 and P. aureum. There is no difference in these species, 

 except in the color of the granules of lime ; the form of the 

 sporangium and the shape and color of the stipe are the same 

 in all of them. No two authorities agree in the presentation 

 of this species. 



2. Physarum cupripks B. & R. Sporangium orbicular, 

 much depressed, the base umbilicate, stipitate, cernuous; the 

 greater part of the wall thin and delicate, with a scanty cov- 

 ering of yellow granules of lime, becoming naked and then 

 brassy and iridescent, after maturity soon disappearing ; the 

 lower basal portion thicker and more persistent, with a layer 

 of small yellow scales of lime. Stipe long, flexuous, bent at 

 the apex, plicate, pale brown to yellow-brown, darker toward 

 the base. Capillitium of slender tubules, forming a dense 

 persistent net-work, more or less expanded at the angles; the 

 lime-nodules small, numerous, yellow, angular and fusiform, 

 below often confluent. Spores globose, very minutely warted, 

 violaceous, 8-10 mic. in diameter. 



Growing on old wood ; rare. Sporangium .4-. 5 mm. in 

 diameter, the stipe two or three times this length. The lime 

 nodules are found both on the sides and at the angles of the 

 meshes, and are fusiform or angular accordingly ; the lime is 

 scanty above, but in the lower part of the capillitium the 

 nodules sometimes run together into lobed and branched 

 forms. This is Physarum berkeleyi of Rostafinski's mono- 

 graph. 17 



