66 THE NORTH AMERICAN SLIME-MOULDS 



and specimen do not correspond. By that name the species has 

 however, been hitherto known in the United States. 



Eastern United States, common ; rare west of the Mississippi. 



Reported from Brazil, Japan and the tropic islands round the 

 world. Portugal. 



20. Physarum citrinum Schumacher. 



1803. Physarum citrinum Schum., Enum. PL SaelL, II., p. 201. 

 1911. Physarum citrinum Schum., List., Mycetozoa, 2nd ed., p. 51. 



Sporangia gregarious, scattered, globose, somewhat flattened below, 

 pale yellow, citrine, stipitate; the peridium thin, covered almost com- 

 pletely with small calcareous scales ; stipe stout, erect, fragile, tapering 

 upwards, furrowed, opaque, arising from a small hypothallus which is 

 anon continuous from one sporangium to the next; columella small, 

 conical, yellow ; capillitium a rather dense, delicate network, the 

 calcareous nodules yellow, numerous, roundish, and generally small ; 

 spore-mass black; spores under the lens violaceous, almost smooth, 

 about 8 jLt. 



This species seems to be rare in the United States. It resembles 

 somewhat P. jnelleum, from which it is distinguished by its yellow 

 stipe. P. galbeiitn is a smaller form, and lacks the columella. Rosta- 

 finski strangely confused the synonymy here, including even P. 

 rufipes Alb. & Schw. 



New England, Ohio, Colorado. 



21. Physarum globuliferum (Bull.) Pers. 



1791. Sphaerocarpus globuliferus Bull., Champ., PI. 484, Fig. 3. 



1801. Physarum globuliferum Pers., Syn., p. 175, T. III., Figs. 10, 11, 12. 



1829. Diderma globuliferum Fries, Syst. Myc, III., p. 100. 



1876. Physarum peter sii farloivii Rost., Mon., A pp., p. 6. 



1879. Physarum albicans Peck, Rep. N. Y. Mus., XXX., p. 50. 



1893. Physarum columbinum Macbr., Bull. Lab. Nat. Hist. Io<wa, II., 384. 



1899. Physarum globuliferum (Bull.) Pers., Macbr., N. A. S., p. 45. 



1911. Physarum globuliferum Pers., Lister, Mycetozoa, 2nd ed., p. 48. 



Sporangia gregarious, stipitate, globose, or slightly depressed above, 

 pale blue-gray or pure white ; stipe sometimes equal to the sporangium, 

 generally longer, slender, slightly wrinkled, white, or yellow, pallid, 



