Physarum 43 



15. Physarum Newtoni Macbr. Bull. Nat. Hist. S. U. Iowa 2: 

 390. 1893. 



Plasmodium dark violet (Macbr. & Martin). Sporangia sim- 

 ple, gregarious, short-stipitate or sessile, globose or flattened, 

 when not globose depressed and deeply umbilicate above, purple, 

 smooth, thin-walled, stipe when present very short and concolor- 

 ous; columella none; hypothallus none; capillitium abundant, 

 delicate, with more or less well developed nodules, which are also 

 concolorous; spores by transmitted light dark brown, thick- 

 walled, rough, nucleated, about 10 /x. 



Type locality: Colorado. 



Habitat: On sticks. 



Distribution: *Colorado, *Oregon. 



Illustration: Lister, Mycetozoa ed. 3. pi. 28. 



The description is the original one of Macbride based on the 

 type collection from Colorado which I have not seen. Two speci- 

 mens from Japan in the Herbarium of the New York Botanical 

 Garden, believed to be P. Newtoni, differ materially from the 

 description of the Colorado collection. The sporangia are purple, 

 globose, 0.6 mm. diam., on stalks 0.6 to 0.8 mm. high, rising from 

 a well-marked, circular hypothallus. The sporangial wall is 

 rough with many large clusters of purple lime-granules and refuse 

 matter, thicker at the base, and persisting for nearly half the 

 height of the sporangium. There is no columella. The capil- 

 litium has delicate, branched, pale violet threads, attached to the 

 sporangial wall, and converging inward, with many irregular, 

 purple lime-knots. The spores are purplish red, irregularly 

 spinulose, 8-10 /i diam. 



16. Physarum psittacinum Ditm. in Sturm, Deutsch. FI. Pilze 1: 

 125. 1817. 



Plasmodium orange (Lister). Sporangia gregarious or occa- 

 sionally loosely clustered and angled, globose, 0.5 to 1 mm. diam., 

 purplish blue mottled with red, iridescent, stalked; sporangial 

 wall membranous, thin, hyaline, sprinkled with orange spots of 

 granular matter, limeless. Stalk erect, or curved, furrowed, 

 tapering upward, without lime, vermilion or orange-red, rising 

 from a well-developed hypothallus of the same color. Columella 

 none. Capillitium a close network of flat, arching, colorless or 

 yellowish threads, broad at the axils; lime-knots numerous, 



