PHYSARUM 69 



Plasmodium dark red. Sporangia scattered or gregarious, globose, 

 even, or somewhat wrinkled, dark red, stipitate ; stipe cylindric, even, 

 sub-concolorous or blackish ; columella small or none ; capillitium 

 free from spores, whitish, with a slight pinkish tinge; spores dark 

 brown in mass, dark red when separated, globose, smooth, 7.5-8.5 /u,. 



The capillitium is very delicate, and when cleared of spores the 

 knot-like thickenings are seen to be very small and of a dark red 

 color, to which is probably due the pinkish tinge which marks the 

 whole. A part only of the thickenings are filled with lime granules. 

 The dark red granules of the sporangium walls are abundant and 

 appear to form a continuous crust. 



This is P. atrorubrum Peck, and his description, /. c, has been 

 closely followed. The very brief description in Grevillea, however, 

 antedates the New York publication and, all inadequate as it is, no 

 doubt applies to the same thing. 



Not rare. New York, Pennsylvania, Ohio, Missouri, Iowa. 



25. Physarum pulcherripes Peck. 



1805. Physarum aurantiacum var.rufipes Alb & Schw., Cok^^ Fa«^,, p. 9+. 



1829. Diderma rufipes (Alb. & Schw.) Fries, Syst. Myc, III., p. 101. 



1873. Physarum pulcherripes Peck., Bull. Buff. Soc. Nat. Hist., I., p. 64. 



1873. Didymium erythrinum Berk., Gre<v., II., p. 52. 



1873. Didymium ravenelii Berk. & C, Grev., II., p. 53. 



1873. Physarum petersii Berk. & C, Grev., II., p. 66. 



1875. Physarum schumacheri Spr. var. rufipes Alb.& Schw.,Rost.,Mon., p. 99. 



1894. Physarum pulcherripes (Peck), Lister, Mycetozoa, p. 41. 



1896. Cytidium rufipes {A\h. Sc Schvt.) Morg., Jour.Cin.Soc. Nat.Hist., p. U. 



1899. Physarum rufipes (Alb. & Schw.) Morg., Macbr., N. A. S., p. 50. 



1911. Physarum pulcherripes Peck., List., Mycetozoa, 2nd ed., p. 49. 



Sporangia gregarious, dark-colored, sprinkled with orange flakes of 

 lime, globose, the wall thin, deciduous, stipitate ; stipe slender, erect, 

 deep red, sometimes black below, pale or orange above, and supported 

 on a well-developed hypothallus; columella scant or none; capilli- 

 tium dense, the meshes and nodes unusually small and delicate, the 

 latter reddish or yellow ; spore-mass black; spores by transmitted light, 

 violet-tinted, 8-10 ju., almost smooth. 



The striking contrast of color between sporangia and stipes renders 

 this species at sight, quite distinct from any related form. The 



