188 



Mycetozoa of North America 



Junction zone between cup and net broad, with 

 numerous perforations merging gradually into 

 the firm, distinct net; cup strongly ribbed; plas- 

 modic granules 1-2 ix diam. 

 Junction of cup and net more or less sharply defined. 

 Nodes of net flattened, thickened, or inconspicu- 

 ous. 

 Plasmodic granules in typical examples large, 

 2-2.5 /x diam.; spores in mass yellowish 

 brown. 

 Cup distinct, toothed and occasionally per- 

 forated at the margin; spores evenly 

 warted or nearly smooth. 

 Similar to C. piriformis but spores irregu- 

 larly warted. 

 Plasmodic granules smaller than 2 ix diam. 

 Cup distinct, toothed; net with well defined 

 regular meshes; nodes prominent, flat- 

 tened or thickened; spores golden yellow 

 in mass. 

 Cup well developed, dentate, with promi- 

 nent intervening teeth extending into 

 a loose, irregular net with very large 

 meshes; nodes often inconspicuous. 

 Sporangia minute; cup when present well 

 defined; often without cup or nodes; 

 spores ochraceous. 

 Nodes of net always thickened, convex, angular 

 or branching. 

 Cup present or more or less obsolete, often 

 irregular at the margin; nodes angular and 

 branching; meshes of net close and regular; 

 spores ochraceous. 

 Similar to C. intricata but nodes convex or 



round. 

 Similar to C. intricata but meshes of net larger; 



habitat on leaves. 

 Cup always present and distinct, rim even and 

 regular; stalk 4 to 10 times the height of the 

 sporangium; spores reddish or brownish in 

 mass. 

 Cup wanting. 



Sporangia small, on long stalks; net extending to 

 the top of the stalk or a small basal disc; nodes 

 thickened and rounded; spores ochraceous in 

 mass. 

 Cup replaced by nine or more free ribs; nodes 

 flattened. 

 Sporangia red. 



2. C. macrocarpa 



3. C. piriformis 



4. C. dictyospora 



5. C. aurantiaca 



6. C. rufa 



7. C. minutissima 



8. C. intricata 



9. C. tenella 



10. C. laxa 



11. C. latiguescens 



12. C. microcarpa 



13. C. splendens 



14. C.ferriiginea 



