The Myxomycetes of the Miami Valley, Ohio. 



i r 



Physarum albicans Peck. The specimens with the columella 

 well nigh obsolete, may be Tilmadoche columbina Rost. 



6. CyTidium MKLLEUM B. & Br. Sporangium globose, 

 stipitate or subsessile ; the wall a thin yellowish membrane, 

 rugulose, covered by large irregular scales of lime, honey- 

 color to golden-yellow, breaking up irregularly. Stipe short, 

 sometimes very short or nearly obsolete, snow-white, expand- 

 ing at the base into a small white hypothallus, tapering up- 

 ward and entering the sporangium as a short obtusely conical 

 columella. Capillitium a loose net-work of delicate tubules 

 with broad vesicular expansions containing much lime ; the 

 nodules numerous, white or sometimes yellow, large, irregu- 

 lar, lobed, and branched. Spores globose, nearly even, pale 

 violaceous, 7-9 mic. in diameter. 



Growing on old leaves, sticks, herbaceous stems, etc.; not 

 uncommon in this region. Sporangium 4--5 mm. in diameter, 

 the stipe about the same length or much shorter. Didymium 

 melletim B. & Br. Didymium chrysopeplum B. & C. also be- 

 longs here and not with C. citrinum. 



§2. RKxiKiyLA. Sporangium ellipsoidal or pyriform, the 

 columella prolonged nearly to the apex of the sporangium. 



7. Cytidium pknetrale Rex. Sporangium ellipsoidal 

 or pyriform, stipitate; the wall a thin pellucid membrane, 

 covered with small scales of lime, yellow-gray to greenish- 

 yellow, rupturing at maturity into two to four segments. 

 Stipe long, slender, translucent, pale red to dark red in color, 

 tapering upward, entering the sporangium and prolonged 

 nearly to the apex as a slender columella. Capillitium of 

 very slender tubules, radiating from numerous points of the 

 columella, forming a delicate net-work of very small meshes, 

 scarcely expanded at the angles; the nodules of lime small, 

 not numerous, roundish or obtusely angled, white or yellow- 

 ish. Spores globose, very minutely warted, pale violaceous, 

 5-5~6-5 mic. in diameter. 



Growing on old wood. A rare and singular species. 

 Sporangium .5-. 7 mm. in height by .3~.5 mm. in diameter, the 

 stipe two or three times the height of the sporangium. 

 There is an affinity between this species and the Physarella. 

 The obscure Tilmadoche hians Rost., may be the same as the 

 present species. 1 1 



