PHYSARUM 53 



thicker and more calcareous stipes than is usual in Philadelphia 

 specimens. The walls of the sporangia when fully matured 

 generally rupture into several petal-like segments which finally 

 become reflexed. The description given by Berkeley is entirely 

 insufficient. N. A. T., 2489. 



Rare. Pennsylvania, Ohio, Louisiana, Texas. 



33. PHYSARUM GALBEUM Wingate. 



1890. Physarum galbeum Wingate, Ellis, N. A. F., 2491 (no description). 

 1892. Physaruin petersii Berk, and Curt., Mass., Mon., p. 296 (in part). 

 1894. Physarum berkeleyi Rost., Lister, Mycetozoa, p. 48 (in part). 



Sporangia scattered, globose, stipitate, often nodding, golden 

 yellow, the peridium exceedingly thin, breaking up into patches 

 on which the yellow lime granules are conspicuous ; stipe non- 

 calcareous, pale brown or amber colored, longitudinally wrinkled, 

 about one and one-half times the diameter of the peridium ; 

 columella none ; hypothallus none ; capillitium dense, extremely 

 delicate, the nodes only here and there calcareous, the lime 

 knots when present small, angular, yellow ; spore-mass pale 

 brown; spores almost smooth, lilac or violet-tinted, 7.5-10 /*. 



Distinguished among the small delicate species with which it 

 will be naturally associated, by the yellow, richly calcareous wall 

 of the sporangium and the almost limeless capillitium. The 

 stipe is hollow and contains irregular masses of refuse granular 

 matter, but no lime so far as we have been able to discover. P. 

 flavicomum, to which the species is related most closely, differs in 

 having the wall non-calcareous, iridescent, as well as in the color 

 throughout ; the character of the capillitium, in which lime is 

 abundant ; the absence of refuse matter in the stem. 



Pennsylvania, Iowa, Minnesota. 



34. PHYSARUM FLAVICOMUM Berkeley. 



PLATE XV., Figs. 3, 3 a. 



1845. Physarum flavicomum Berkeley, Hook. Jour. Bot., IV., p. 66. 

 1873. Physarum cupripes, Berk, and Rav., Grev., II., p. 65. 

 1875. Physarum berkeleyi, Rost., Man., p. 105. 



