4 



Cincinnati Society of Natural History. 



of slender tubules, combined into an irregular network, 

 attached on all sides to the wall of the sporangium, and bear- 

 ing everywhere short pointed or uncinate free branchlets ; 

 the lime in thin transverse plates and irregular nodules. 

 Spores globose, violaceous. 



The peculiar characteristic of this genus is the short free 

 hooked and pointed branchlets of the capillitium. 



i. Ciknkowskia reticulata A. & S. Plasmodiocarp 

 more or less elongated, curved and flexuous, simple or 

 branched, sometimes confluent and reticulate, breaking away 

 first along the upper surface, leaving an irregular margin. 

 The wall a firm yellow membrane, with thinner hyaline areas 

 and with thicker yellow-brown or red-brown spots ; the outer 

 surface without any lime, smooth, and shining; the inner 

 surface with a dense layer of yellow granules raised at 

 intervals into transverse ridges, these are connected with 

 broad thin flat plates of lime which traverse the capillitium, 

 forming imperfect septa to the sporangium. Capillitium con- 

 sisting of slender yellow tubules, forming a network of 

 irregular meshes, with slight expansions at the angles and 

 bearing along the sides short pointed or uncinate free branch- 

 lets ; the tubules containing a few scattered yellow nodules 

 of lime various in size and shape. Spores globose, very 

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



Growing on old wood, bark, leaves, etc. Plasmodiocarp in 

 veins .3-. 5 mm. in thickness, sometimes forming a net-work 

 a centimeter or more in extent. This curious Myxomyces 

 seems very rare in America. I have met with it but once. 

 The specimen in the herbarium of Schweinitz, marked 

 Physarum reticulatum, is not this species, though it answers 

 well enough to the original description. 



III. I^kocarpus Link. Sporangia subglobose or obovoid, 

 stipitate or sessile; the wall a more or less' thickened mem- 

 brane, the external surface destitute of lime, polished and 

 shining, irregularly dehiscent. Stipe short, poorly developed 

 or sometimes wanting. Capillitium of slender tubules, form- 

 ing an irregular net-work more or less expanded at the angles ; 



4 



