PHYSARUM 27 



f Columella none. 



1. Stipe crimson . . .28. P. pulcherrimum 



2. Stipe pale, calcareous at top, 32. P. obrusseum 



3. Stipe yellow ... 24. P. maculatum 

 ft Columella present. 



1. Stipe brilliant orange ... 29. P. rufipes 



2. Stipe dull, calcareous within . 27. P. ravenelii 



3. Stipe yellow . . . . 38. P. citrinum 

 *** Stipe non-calcareous. 



f Columella none. 



1 . Sporangia yellow. 



a. Stipe also yellow . . 33. P. galbeum 



/3. Stipe reddish or fuscous. 



Spores minutely spinulose, 



1 6. P. auriscalpium 



10 Spores rough spinulose, 17. P. variabile 



2. Sporangia iridescent ; lime none, or flecks only. 



a. Stipe red ... 30. P. psittacinitnt 

 /3. Stipe fuscous . . 34. P. flavicomum 

 y. Stipe thick, black . . 22. P. tropicale 



8. Stipe channelled . . 21. P. leucophcenm 



3. Sporangia white or gray, with encrusting lime. 



a. Sporangia with persistent, non-calcareous base, 



31. P. nodulosum 



|3. Sporangia small, botryoid, 20. P. nicaragitense 

 y. Sporangia larger, often sessile or plasmodio- 

 carpous . . . 19. P. nefroideitm 



8. Capillitium, with a white, central, calcareous 

 nodule . . . 35. P. nucleatiun 



ft Columella two-thirds the height of the sporangium, non- 

 calcareous ..... 36. P. penetrate 



i. PHYSARUM ELLIPSOSPORUM Rost. 



PLATE X 0; , Figs. 3, 3 a, and 3 b. 



1831. Enteridiiim cinereuin Schw., N. A.F., No. 2365. 



1875. Physarum ellipsosporum Rost., Mon., App., p. 10. 



1884. sEtJialiopsis stercoriformis Zopf, Pilsthiere, p. 150. 



1894. Fuligo ellipsospora Lister, Mycetozoa, p. 67. 



1896. Fuligo cinerea (Schw.) Morgan, Cin. Soc. Nat. Hist., p. 105. 



Plasmodium milk-white, watery. Plasmodiocarp long and 



widely effused, anon winding, here and there reticulate, always 



'applanate, the peridial cortex membranaceous, firm, thick, and 



