PHYSARUM 61 



had rather badhamioid capillitium. The sessile physarums of Fries 

 were also before him, those especially, "floccis albis." Of these one 

 shall be B. panicea, one B. lilacina and one B. verna, described as 

 having rather delicate colorless capillitial tubes combined in a loose 

 net, the calcareous deposits about the enlarged intersections scanty, 

 the spores 12.5 jx. 



The description of the fructification as a whole is a condensed 

 statement of that which describes P. vernum, and all taken together 

 indicates some physarum. See now No. 3 preceding, p. 51. 



P. plumbeum Fr. belongs here. It has similar spores, the only dif- 

 ference is a less calcareous peridium and more scattered habit of 

 fructification with more nearly regular, depressed-globose sporangia. 



P. cinereum Pers. as cited by Link, op. cit., is apparently a bad- 

 hamia, may be P. vernunij while P. griseum is probably the present 

 species. 



14. Physarum virescens Ditmar. 



Plate VIII., Figs. 7,7 a, 1 b. 



1817. Physarum virescens Ditmar, Sturm, Deutsch. Fl. Pilze, I., p. 123, 

 PI. 61. 



1875. Physarum ditmari Rost, Mon., App., p. 8. 



1892. Physarum ditmari Rost., Macbn, Bull. Lab. Nat. Hist. la., II., p. 155. 



1894. Physarum 'virescens Ditmar, Lister, Mycetozoa, p. 65. 



1909. Physarum virescens Ditmar, Torrend, Flo. d Myx., No. 207. 



1911. Physarum virescens Ditmar, Lister, Mycetozoa, 2nd ed., p. 83. 



Sporangia sessile, crowded or heaped in small bunches, a dozen or 

 more sporangia in one pile, spherical, ovoid or elongate, yellow or 

 greenish yellow; peridium thin, fragile; capillitium delicate, with 

 rather small, irregular, yellowish, calcareous nodes; columella none; 

 spores bright violet, minutely roughened, 7—9 /x. 



This species occurs more commonly on moss-tufts, with which it is 

 frequently con-colorless, or escaped on dead leaves, etc. The peridium 

 is flecked with calcareous scales or grains stained yellow or green, and 

 to these the whole fruit owes its peculiar color. The color and 

 aggregate, heaped sporangia are distinctive macroscopic characters. 



In the Monograph, p. 113, Rostafinski adopted properly Ditmar's 

 name for this species. Upon later consideration, in the Appendix, 



