PHYSARUM 63 



suggestive; it is a diderma gone wandering into the camp of the physa- 

 rums if one may judge from Miss Lister's graphic plate. 



The name given to this species by Mr. Lister is antedated by over a 

 century. Schumacher (Enum. PI. Saell. 2 : 199. 1803) gave the name to 

 what Fries thought was a perichaena; at any rate not a physarum. 

 Fries makes Schumacher's combination a synonym for Perichana 

 quercina Fr., which Rostafinski in turn makes synonymous with 

 Perichana corticalis (Batsch) Rost. According to the International 

 Rules as revised at Cambridge, the name Physarum luteo-album cannot 

 be revived even though the earlier name is universally regarded as 

 non-valid. A new name must, therefore, be applied, and we suggest 

 listeri, as suggested in N. A. Slime-Moulds, 2nd ed., p. 71. 



Var. aureum Ronn, as distributed by Jaap, No. 84, does not seem to 

 differ from the typical form sufficiently to justify its recognition. 



Colorado; Europe, India. 



32. Physarum perfectum M. E. Peck 



Am. Jour. Bot. 19 : 134. 1932. 



Sporangia loosely gregarious, grayish white, globose, stipitate, 

 0.6-0.8 mm. in diameter; hypothallus very thin, colorless, wide spread- 

 ing; stipe yellowish white, stout, calcareous, nearly smooth, slightly 

 narrowed upward, equalling or a little surpassing the diameter of the 

 sporangium; columella well developed, white, conical, nearly one-third 

 the height of the sporangium; peridium a thin membrane, evenly 

 granular with included lime and thickly sprinkled with round, mainly 

 superficial, white scales of lime; capillitium moderately dense with 

 abundant, rounded and elongated, pale yellowish, calcareous nodes; 

 spores minutely roughened, violaceous brown, 10-11 (x. 



Seemingly a well-marked species, having a trim, finished appearance. 

 Two or three colonies have been found in the neighborhood of Salem, 

 Oregon. The most striking structural feature is the stipe. Other fea- 

 tures suggest P. melleum (Berk. & Br.) Mass., but the color and greater 

 size at once distinguish it. 



Oregon: on decaying bark of Populus sp. 



33. Physarum globuliferum (Bull.) Pers. 



Syn. Meth. Fung. 175. 1801. 

 PI. V, Figs. 76, 77, 78. 



1791. Spharocarpus globulifer BuR., Champ. 134. 



1791. Stemonitis globulifera (Bull.) Gmel, Syst. Nat. 2 : 1469. 



1805. Trichia globulifera (Bull.) DC, Fl. Fr. 2 : 253. 



