108 THE NORTH AMERICAN SLIME-MOULDS 



1893, Craterium pedunculatum Trent., Macbr., BuU. Lab. Nat. Hist. loiva, 

 II., p. 385. 



1894. Craterium pedunculatum Trent, Lister, Mycetozoa, p. 70. 

 1899. Craterium minutum (Leers) Fr., Macbr., N. A. S., p. 78. 

 1911. Craterium minutum Fr., List., Mycetozoa, 2nd ed., p. 94, 



Sporangia scattered, gregarious, cyathiform or turbinate, grayish 

 brown, stipitate, the peridial wall rather thick, double, opening by a 

 distinct lid which lies usually below the slightly thickened and everted 

 margin of the cup ; stipe paler, translucent, about equalling in height 

 the peridial cup, longitudinally wrinkled, with hypothallus scant or 

 none; capillitium physaroid, the calcareous nodules large, white, and 

 generally aggregated at the centre of the cup ; spore-mass black, spores 

 by transmitted light violaceous, minutely warted, 8-10 yu,. 



This is the most highly differentiated of the whole series. The 

 cup is shapely and well defined, while the lid is not only distinct, but 

 is a thin, delicate membrane of slightly different structure when com- 

 pared with the peridial wall. It is in all the specimens before us 

 much depressed below the mouth of the sporangium, and the whole 

 structure in our specimens corresponds with Fries' description of C. 

 pendunculatum. Trent., while specimens received from Europe cor- 

 respond to Fries' account of C. minutum Leers. Nevertheless we are 

 assured that the two forms are in Europe developed from the same 

 Plasmodium, and therefore adopt the earlier specific name as above. 

 N. A. F., 2500. This is probably Fungoides cojivivalis of Batsch 

 and Micheli. 



In this species yellow sporangia are sometimes seen. Miss Currie 

 reports from Toronto such variation and in Europe the case seems 

 not unusual. 



In fact, there is a yellow tinge about the sporangia of every species 

 listed here, except the first. With the same exception, the Plasmo- 

 dium in every case is yellow. 



Common throughout the eastern United States, west to Iowa, 

 Colorado, and south to Louisiana; cosmopolitan. 



5. Physarella Peck. 

 1882. Physarella Peck., Bull. Torr. Bot. Club, IX., p. 61. 



Sporangium pervious to the base, the interior walls forming a per- 

 sistent spurious columella; capillitium composed of filaments with 



