38 THE NORTH AMERICAN SLIME-MOULDS 



Sporangia stlpitate or sessile, orbicular discoidal, irregularly 

 elongated or plasmodiocarpous, averaging about 1 mm. in width, gen- 

 erally stipitate, and when stipitate, flattened or depressed above, plane 

 or slightly umbilicate below; the peridium simple, more or less trans- 

 lucent from the varying number of innate granules, sometimes cov- 

 ered with circular flat masses of lime, gray except the point of attach- 

 ment to the stipe which is brown; stipe short, black, rough, plicate; 

 capillitium dense at the centre, radiant at the periphery where it 

 meets the sporangial wall, white; spores violaceous black, minutely 

 warted, 12-15 fx. 



This is a beautiful species, easily known by its discoidal or almost 

 annulate sporangia mounted upon short dark black stipes. The 

 stipe in western collections is sometimes very short, but generally suf- 

 fices to raise the sporangium, a little at least, above the substratum. 

 Sessile and plasmodiocarpous forms do occur with the typical stipitate 

 phase, but may be regarded here as elsewhere as indicative of incom- 

 plete development. Plasmodium cream-colored, or pale yellow. 



Pennsylvania, Ohio, Iowa, Nebraska, South Dakota, Colorado. 



9. Badhamia magna Peck. 



Plate XIV., Fig. 1. 



1871. Dictydium magnum Peck, Rep. N. Y. State Mus., XXIV., p. 84. 



1879. Badhamia magna Peck, Rep. N. Y. State Mus., XXXI., p. 56. 



1894. Badhamia macrocarpa Rost., Lister, Mycetozoa, p. 34, in part. 



1892. Baliamia <varia Mass. Mon. Myxog., p. 319, in part. 



1894. Badhamia magna Peck, List., Mycetozoa, p. 33. 



1899. Badhamia capsulifera (Berk.) Macbr., A''. A. S., p. 68. 



1911. Badhamia magna Peck, Lister, Mycetozoa, 2nd ed., p. 34. 



Sporangia globose or ellipsoid, .7-1 mm., pale iridescent, stipitate; 

 peridium thin with slight calcareous deposits, rugulose, opening ir- 

 regularly, white ; stipe long flaccid, straw-colored ; capillitium an 

 elegant uniform net, its threads stiffened by slight deposits of lime, 

 the nodes little thickened, badhamioid ; spores free, dusky with a 

 shade of violet, minutely spinulose, about 10 fi. 



This beautiful species closely resembles some forms of B. utricu- 

 laris from which it differs chiefly in its unclustered smooth spores. 



