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Cincinnati Society of Natural History. 



in diameter, the stipe not longer than the diameter. This is 

 quite a robust species, both externally and in the broad, flat 

 tubules of the capillitium. 



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 hypo- 

 thallus, tapering upward, white or cream color to ochraceous, 

 Capillitium a dense net-work of tubules, more or less ex- 

 panded 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 Cytidhim globu- 

 liferum 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. Spo- 

 rangia .6-.8 mm. in diameter, the stipe very short. Described 

 in An?ials 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. 



B. Sporangia sessile. 



22. Physarum pi/umbeum Fr. Sporangia small, globose 

 or obovoid, sessile, on a narrow base, gregarious, sometimes 

 close but seldom confluent; the wall a thin violaceous mem- 



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