92 THE MYXOMYCETES 



1805; Physarum nutans var. coccineum Fr., 1829; Physarum striatum 

 var. aurantiacum Fr., 1829). This is a bright orange phase, arising 

 from an orange plasmodium. Brandza, who would restrict P. viride 

 to delicate yellow forms with long slender stalks and fusiform yellow 

 nodes, notes that the two forms never occur together and believes 

 that they represent distinct species. Common. 



Var. incanum Lister, Mycetozoa 47, 1894 (Stemonitis bicolor Gmel., 

 1791 ; Physarum luteum Pers. 1801 ; Trichia lutea DC, 1805). Yellowish 

 gray, with pale yellow nodes. Common. 



Var. hinnuleum G. List., Jour. Bot. 62 : 17, 1924, from India, is 

 described as with fawn colored sporangia and nodes and buff spores. 



Common and world-wide in its distribution. 



74. Physarum bethelii {Macbr.) List. 



Mycetozoa ed. 2. 57. 1911. 



1899. Tihnadoche bethelii Macbr. in litt. 



1913. Physarum viride Pers. var. bethelii Sturgis, Colo. Coll. Pub. Sc. Ser. 

 12 : 439. 



Sporangia scattered, globose, umbilicate below, 0.5-1 mm. in diam- 

 eter, iridescent-blue, or sometimes tinged by the presence of delicate 

 pale yellow calcareous scales, stipitate; stipe rather short, black or dark 

 brown, equal; capillitium dense, radiating from the black, slightly in- 

 trusive summit of the stipe, and ascending from the base of the pe- 

 ridium; the nodules not numerous, elongate, branching betimes, pale 

 yellow; spores minutely roughened, 10-12 jx. Plasmodium yellow. 



Both Miss Lister and Mr. Hagelstein agree with Dr. Sturgis in con- 

 sidering this merely a variety of P. nutans. Doctor Brandza believes it 

 distinct. The material at hand seems sufficiently distinct to justify 

 retaining it, pending fuller information. 



This beautiful, delicately tinted little species is clearly tilmadochoid 

 in the Friesian sense. The capillitium persists after the fall of the upper 

 filmy peridium, adherent below to the persisting peridial base. Col- 

 lected thus far only by Professor Bethel and by Professor Sturgis, 

 Colorado, by Mr. Hagelstein in Long Island and by Professor Brandza 

 in Rumania. 



75. Physarum rigidum G. Lister 



Mycetozoa ed 3. 36. 1925. 

 1911. Physarum viride Pers. var. rigidum Lister, Mycetozoa ed. 2. 56. 



Sporangia gregarious, stalked, lenticular, often umbilicate above, 

 yellow, dull orange or iridescent from absence of lime granules; stalk 

 slender, orange or yellow above, dark below from included refuse 





