The l\fyxoniycetes of the Miami Valley, Ohio. 145 



lime, the upper part gradually breaking away. Stipe long, 

 erect, tapering upward, pale yellow-brown, darker below, 

 expanding into a small brown hypothallus ; the columella 

 central, large, discoid, or sometimes rough and irregular, pale 

 ochre or yellowish. Capillitium of much-branched colorless 

 threads, radiating upward and downward from the columella. 

 Spores globose, very minutely warted, dark violaceous, g-ii 

 mic. in diameter. Plate VII, Fig. 38. 



Growing on old leaves, sticks, etc. Sporangium .5-. 6 mm. 

 in diameter, the stipe about twice the diameter. 



4. DiDVMiuM MiCROCARPUM, Fr. Sporangium small, 

 globose, the base slightly umbilicate, stipitate ; the wall a 

 dark-colored membrane, covered with abundant snow-white 

 crystals of lime. Stipe long, slender, erect, delicately striate, 

 yellow-brown to blackish in color, expanded at the base into 

 a small hypothallus; the columella small, globose, sessile or 

 substipitate, pale yellow-brown. Capillitium of pale brown 

 threads, somewhat branched and forming a loose net. Spores 

 globose, very minutely warted, violaceous, 6-7 mic. in 

 diameter. 



Growing on old wood, leaves, mosses, etc. Sporangium 

 .4-.5 mm. in diameter, the stipe two or three times as long. 

 The species is more particularly distinguished by its small 

 spores. 



5. DiDVMiUM :minus. Lister. Sporangium depressed-glo- 

 bose, the base umbilicate, stipitate, rarely sessile and pla.'-mo- 

 diocarp ; the wall a dark-colored membrane with a thin 

 layer of stellate crj-stals of lime, breaking up gradually 

 and falling away. Stipe erect or sometimes bent at the 

 apex, variable in length, rarely wanting, from pale brown 

 to blackish in color, rising from a small h^-pothallus ; the 

 columella reaching the center, brown or blackish, rough, 

 convex, subglobose or pulvinate, substipitate. Capillitium 

 of slender colorless threads, radiating from the columella and 

 more or less branched outwardly. Spores globose, very 

 minutely warted, violaceous, 8-10 mic. in diameter. Plate 

 VII, Fig. 39. 



Growing in vast abundance in Spring on old leaves, bark, 

 wood, etc. Sporangium .4-. 6 mm. in diameter, the stipe 

 scarcely longer but usually shorter than the diameter of the 



