80 THE NORTH AMERICAN SLIME-MOULDS 



38. Physarum compressum Jib. ^ Schw. 



Plate XVIIL, Fig. 14, and Plate XIX., Fig. 12 and Fig. 4. 



1805. Physarum compressum Alb. & Schw., Fung. Lus., p. 97. 



1875. Physarum nefroideum Rost, Mon., p, 93, in part. 



1875. Physarum affine Rost., Mon., p. 94. 



1909. Physarum compressum Alb. & Schw., Torrend, Fl. des Myx., p. 197. 



1911. Physarum compressum List., Mycetozoa, 2nd ed., p. 70. 



Sporangia more or less scattered, compressed-^dbost, or compressed- 

 reniform, i. e. often umbilicate, stipitate, sessile, or elongate as if 

 plasmodiocarpous, calcareous, white or ashen ; peridium thin, covered 

 with squamules, opening irregularly, usually by apical cleft; stipe, 

 when present, short, stout, more or less sulcate, dark brown or ashen ; 

 capillitium a rather loose net, the nodules white, variable in size and 

 shape; spores purplish-brown, delicately roughened, about 10-12.5 /x. 



P. affine R. was in this connection set up for European types com- 

 pressed indeed, but more strongly reniform. The author says in his 

 further description that the form affine is less definitely umbilicate, 

 has white stems, etc. ; allantoid, one would now say. Such forms 

 now begin to appear in America; and if for these a specific name is 

 needed, it is provided, P. affie Rost., Plate XIX., Fig. 4. 



This seems to be a cosmopolitan species, now that we have found 

 it. However, in North America it is rare. It is reported from Penn- 

 sylvania, from Colorado; Harkness found it in California, and the 

 writer has often collected it in Oregon, on Mt. Rainier, Washington, 

 and in California. Europe. 



39. Physarum notabile nom. nov. 



Plate IX., Figs. 2, 2 a, 2b; Plate XV., Fig. 2 ; and Frontispiece. 



1873. Didymium connatum Peck, Rrp. N. Y. Mus., XXVI., p. 74. 

 1879. Physarum polymorphum (Mont.) Rost., Peck, Rep. N. Y. Mus., 

 XXXI., p. 55. 



1893. Physarum leucophaeum Fr., Ellis, A^. A. F., No. 2396, second exhibit. 



1893. Physarum leucophaeum Fries, Macbr., Bull. Lab. Nat. Hist. loiva, 

 II., p. 156. 



1894. Physarum compressum Alb. & Schw., List., Mycetozoa, p. 53, in part. 

 1896. Physarum connexum Link., Morg., Jour. Cin. Soc, p. 92, in part. 

 1896. Physarum confluens Pers., Morg., /. c, p. 94. 



1899. Physarum nefroideum Rost., Macbr., N. A. S., p. 41, in part. 

 1911. Physarum connatum Lister, Mycetozoa, 2nd ed., p. 71. 



