Physarum. ' 313 



Didymwm subroseum is apparently the same species, with a 

 pinkish tinge to the peridium. (Peck.) 



Physarum effusum, Schw. N r f- 



Broadly effused or vermiform, sinuous, and combined to form 

 a reticulation, whitish, almost membranaceous, very much flat- 

 tened ; threads of capillitium and mass of spores blackish. 



Physarum effusum, Schweinitz, Syn., Fung. Amer., Bar., n. 

 2297; Sacc., Syll., vii., 1 n. 1211. 



Broadly effused on ashes or soot ("pulvere vaporario "). Salem ; 

 United States. 



" : I 



Physarum elegans, Sz. 1 



Sporangia crowded, subrotund, difformed, convex, flattened 

 above, subrugose, clear amethyst-colour ; spores blackish-brown ; 

 threads of capillitium thickish. 



Physarum elegans, Schweinitz, Syn., Fung. Amer., Bar., n. 

 2294; Sacc., Syll., vii., 1, n. 1213. 



Salem ; United States. 



Physarum piceum, Fr. "! 



Scattered ; sporangia sessile, globose, pitch-black, shining ; 

 capillitium threads very slender, and with the spores, smoky- 

 black. 



Physarum piceum, Fr., Syst. Myc., iii., p. 143; Sacc., Syll., 

 vii., 1, n. 1222. 



On heaped up decorticated oak branches. Sweden. 



Sporangial wall very thin, membranaceous, very smooth, but 

 rugulose, dehiscing irregularly, the size of a turnip-seed; 

 capillitium threads very slender, almost inconspicuous. (Fries.) 



Physarum antiades, Fries. D'<Urma 



Sporangia globose, smoky-brown, marked with sinuous lines ; 

 stem branched, blackish, sulcate ; threads and spores brown. 



Physarum antiades, Fr., Syst. Myc., iii., p. 135 ; Sacc., Syll., 

 vii., 1, n. 1209. 



