PHYSARUM 45 



say nothing of the stouter, larger, in every way coarser form, 

 called by Rostafmski P. nefroidcum. For points of difference 

 between this species and Tilmadoche (PJiysaruvi) nutans, see 

 under that species. 



We are inclined to think the species less common in this coun- 

 try. It certainly has not yet been noted west of the Mississippi, 

 and specimens under this name from various correspondents 

 often turn out to be P. nefroideinn. Rostafinski's synonymy 

 here cannot be confirmed. Spharocarpus albus Bull, is, in all 

 its varieties, probably Tilmadoche nntans, and Link's descrip- 

 tions, P. conflncns etc., are entirely inadequate. 



Rare. Maine, Pennsylvania. 



22. PHYSARUM TROPIC ALE Macbr. n. s. 



PLATE XV., Figs. 4, 4 a, 4 b. 



Sporangia scattered, gregarious, turbinate, short stipitate, 

 blue gray, about i mm. in diameter ; peridium above iridescent 

 green, blue, etc., dotted with minute flecks of white lime, below 

 lime-less, purple or bronze shading to the brown of the stipe ; 

 stipe short, stout, slightly rugose, cylindric, non-calcareous, 

 brown ; columella none ; hypothallus none ; capillitium abun- 

 dant, white, the nodes generally calcareous, small, uniform, 

 angular, white, uniformly distributed ; spore-mass, black ; spores 

 dark violet brown, distinctly and closely warted, 12-15 /JL. 



A large, handsome species, recognizable by the peculiar 

 turbinate sporangium, with its iridescent peridial wall in which 

 green strongly predominates above, bronze below. The distinc- 

 tion between the upper and lower peridium would suggest 

 Craterium, but the internal structure is not at all Craterium-Mke. 

 The capillitium is typically of PJiysarum. The color suggests 

 P. IcncopJiccum violascens Rost. From this it is distinguished 

 by its much larger sporangia, larger and rougher spores. 



Mexico ; C. L. Smith. 



23. PHYSARUM GLOBULIFERUM (Bull?) Pcrs. 



1791. Spharocarpus globuliferus Bulliard, Champ., PI. 484, Fig. 3. 



