44 Mycetozoa of North America 



sharply angular, often branching or confluent in the center, 

 bright orange, obscurely granular, sometimes hyaline and trans- 

 lucent. Spores pale violet-brown, minutely warted, 7-10 ju diam. 



Var. fulvum A. & G. Lister, Jour. Bot. 44: 228. 1906. 



Stalk and base of sporangium fulvous yellow instead of ver- 

 milion. 



Type locality: Germany. 



Habitat: On rotten wood and mossy logs. 



Distribution: Florida, Maine, Massachusetts, New Hamp- 

 shire, New York, Ontario, *Oregon, Pennsylvania, Quebec, Ver- 

 mont, *West Virginia; var. fulvum, Florida, *Minnesota, Penn- 

 sylvania. 



Illustration: Lister, Mycetozoa ed. 3. pi. 29. 



Like P. pulcherripes , the favorite habitat is on very wet, rotten 

 wood, often causing imperfect developments. It bears little re- 

 semblance, however, to P. pulcherripes, as it is practically limeless 

 except for the lime-knots, and there is no columella. 



17. Physarum viride (Bull.) Pers. Ann. Bot. Usteri 15: 6. 1795. 



Sphaerocarpus viridis Bull. Herb. Fr. pi. 407, fig. 1. 1788; Bull. Champ. 135. 



1791. 

 Physarum aureum Pers. Neues Mag. Bot. 1: 88. 1794. 



Plasmodium yellow (Lister). Sporangia subglobose or lentic- 

 ular, sometimes concave beneath, nodding, 0.3 to 0.5 mm. diam., 

 yellow, stalked; sporangial wall membranous, dehiscing in frag- 

 ments, with innate clusters of yellow lime-granules. Stalk sub- 

 ulate, slender, striate, gray or straw-colored, sometimes yellow at 

 the top shading to red below, usually brown or black in the lower 

 half from enclosed refuse matter, rarely with lime. Columella 

 none. Capillitium a loose, irregular network of slender, acutely 

 branching, hyaline threads, with fusiform, yellow lime-knots. 

 Spores pale brownish lilac, almost smooth, 7-10 n diam. (Pl.vte 

 15, FIG. 2.) 



Var. aurantium (Bull.) Lister, Mycetozoa 47. 1894. 



Sphaerocarpus aurantiiis Bull. Herb. ¥r. pi. 484, fig. 2. 1790; Bull. Champ. 

 133. 1791. 



Sporangia and lime-knots orange. 



Var. incanum Lister, Mycetozoa 47. 1894. 



