Physarum 47 



at the axils, firmly attached to the base of the sporangium, and 

 usually persistent after dispersal of the spores; lime-knots usually 

 small, angular, yellow. Spores violet-brown, nearly smooth, 7-10 

 n diam. 



Type locality: Australia. 



Habitat: On dead wood 



Distribution: Common in the eastern United States; Colo- 

 rado, Iowa, *Minnesota, Ontario, Quebec. 



Illustration: Lister, Mycetozoa ed. 3. pi. 32, figs, a, b. 



This species forms large colonies, and is probably common 

 everywhere, as it is eastward. The conspicuoHs feature by which 

 it may be distinguished from other species with reddish stalks, is 

 the persistent base of the sporangial wall to which the capillitium 

 is attached by erect threads, and the persistence of the capillitium 

 after dispersal of the spores. 



21. Physarum galbeum Wing.; Macbr. N. A. Slime-Moulds 53. 

 1899. (N. Y. B. G. nos. 6152, 7612, authentic material). 



Plasmodium? Sporangia scattered, usually erect, globose, 0.3 

 to 0.6 mm. diam., smooth, bright yellow, stalked; sporangial wall 

 membranous, with rather dense clusters of yellow lime-granules. 

 Stalk subulate or almost cylindrical, 0.6 to 0.8 mm. high, trans- 

 lucent yellow, or yellow above and orange-red below. Capil- 

 litium a dense network of pale yellow threads or flattened strands; 

 lime-knots reduced to scanty deposits of lime in the expanded 

 axils of the branches. Spores pale violet, almost smooth, 7-10 /x 

 diam. 



Type locality: Pennsylvania. 



Habitat: On dead leaves and stems, occasionally on wood. 



Distribution: *Iowa, Massachusetts, ^Minnesota, New York, 

 *Nova Scotia, *Ohio, *Oregon, Pennsylvania, Vermont, Virginia. 



Illustration: Lister, Mycetozoa ed. 3. pi. 199, figs. d-f. 



This species forms very small developments of a few scattered 

 sporangia on leaves. It is probably widely distributed, but rarely 

 reported because of the difficulty in finding it. The characters 

 that distinguish it from related species are the scattered habit; 

 the yellow stalks without lime; and the nearly limeless, pale yellow 

 capillitium. It resembles, superficially, some phases of P. tene- 

 rum and P. flavicomum. 



