92 THE NORTH AMERICAN SLIME-MOULDS 



Sturgis, Notes on Some Type Specimens of Myxo., in the N. Y. Mu- 

 seum, Trans. Conn. Acad. Arts and Sci., Vol. X., Pt. 2, p. 470, says 

 that of the type almost nothing remains, that the name P. ornatum 

 PL "should be discarded." 



49. Physarum galbeum Wing. 



1890. Physarum galheum Wing., Ell., A'^. A. F., 2491 (no description). 



1892. Physarum petersii Berk. & C, Mass., Mon., p. 296, in part. 



1894. Physarum berkeleyi Rest., List., Mycetozoa, p. 48, in part. 



1899. Physarum galbeum Wing., Macbr., N. A. S., p. 53. 



1911. Physarum galbeum Wing., List., Mycetozoa, 2nd ed., p. 59. 



Sporangia scattered, globose, stipitate, often nodding, golden yel- 

 low, 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; hypo- 

 thallus none; capillitium dense, extremely delicate, the nodes only 

 here and there calcareous, the lime knots when present small, angu- 

 lar, yellow; spore-mass pale brown; spores almost smooth, lilac- or 

 violet-tinted, 7.5-10 jx. 



Distinguished among the small delicate species with which it will 

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

 globose 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. 



50. Physarum tenerum Rex. 



1890. Physarum tenerum Rex., Proc. Phil. Acad., p. 192. 



1894. Physarum polymorphum Rost. van obrusseum, Lister, Mycet., p. 48. 



1899. Physarum obrusseum (Berk. & C.) Rest., Macbr., A'^, A. S., p. 52. 



1911. Physarum tenerum Rex, List, Mycetozoa, 2nd ed., p. 52. 



