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Cincinnati Society of Natural History. 



scanty. Rostafinski's presentation of this species applies well 

 to our specimens. 



7. Physarum connexum Link. Sporangia subglobose, 

 depressed, more or less irregular, sometimes confluent, stipi- 

 tate, or subsessile; the wall a thin violaceous, or brownish 

 membrane, rugulose, thickly covered with small white 

 roundish scales of lime, which sometimes accumulate so as to 

 make the surface rough and uneven. Stipe short, thick, 

 rugulose, from snow white to smoky or sooty, especially 

 toward the base, sometimes with a scanty calcareous hypo- 

 thallus. Capillitium a loose net-work of tubules, much 

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

 rather numerous, ellipsoidal or fusiform, sometimes confluent 

 and elongated. Spores irregularly globose, minutely warted, 

 dark violaceous, 9-1 1 mic. in diameter. 



Growing on old wood and bark. Sporangium .6-1.0 mm. 

 in diameter, the stipe usually shorter than the diameter, 

 sometimes very short ; the lime-nodules about the thickness 

 of the spores. This is a larger and rougher species than P. 

 leiicophcEiim, the sporangium is more often irregular and the 

 spores darker colored. P. confluens and P. connexum of Link. 



8. Physarum compressum A. & S. Sporangium laterally 

 compressed and much flattened, subreniform, stipitate or sub- 

 sessile ; the wall a thin violaceous or brownish membrane, 

 rugulose, thickly covered with small white roundish nodules 

 of lime, similar to those in the capillitium. Stipe short, 

 brown or blackish at least below, sometimes pallid or grayish 

 above, longitudinally rugulose. Capillitium of slender tubules, 

 forming a loose net-work; the nodules of lime small, white, 

 very numerous, roundish or ellipsoidal, often confluent end 

 to end. Spores irregularly globose or angular, minutely 

 warted, dark violaceous, 11-14 mic. in diameter. 



Growing on old stalks and leaves of Zea mays. Sporan- 

 gium variable, .6-1.0 mm. in breadth, the stipe 1 mm. or less in 

 length ; the lime-nodules about the thickness of the spores. 

 According to Saccardo this species is the same as Physarum 

 nephroedhim Rost. 



9. Physarum poeycephaujm Schw. Sporangia con- 

 fluent into a subspheric gyrose-complicate head, composed of 



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