physarum] physaraceae 49 



Mass. Mon., 297 ; Macbr. N. Am. Slime-Moulds, 45. Sphaero- 

 carpus globulifer Bull. Champ., 134, t. 484, fig. 3 (1791). 

 Stemonitis globulifera Gmel. Syst. Nat., ii. p. 1469 (1791). 

 Diderma globuliferum Fries Syst. Myc, iii. 100 (1829). 

 Physarum Petersii var. Farlowii Rost. Mon., App. p. 6 

 (1876). P. albicans Peck, in Rep. New York Mus., xxx. 50 

 (1878) ; Mass. I.e., 312. Physarum columbinum Macbr. in 

 Bull. Nat. Hist. Iowa, ii. 384 (1893). P. relatum Morgan 

 Myx. Miami Valley, 98 (1896). P. delicatissimum Speg. in 

 Anal. Mus. Nac. Buen. Aires, vi. 199 (1899) ? Didymium 

 subroseum Peck I.e., xxviii. 54 (1879). D. longipes Mass. 

 I.e., 236 (1892)? 



PI. 16. — a. sporangia ; b. capillitiuni and spores ; c. spore ; (Philadelphia). 



The types of P. Petersii var. Farlowii Rost., and P. albicans Peck 

 are the same species as the specimen of P. globuliferum in the Strass- 

 burg collection. P. columbinum Macbride, from Iowa (B.M. 1012), 

 is also P. globuliferum ; it has snow-white, occasionally red-brown, 

 stalks, and well-developed conical columellae. In the specimen from 

 Dr. Rex (B.M. 1202) marked by him "P. Petersii var. Farlowii, con- 

 globate form," the sporangia are in clusters of from 6 to 14 together, 

 as in the compound forms of P. polycephalum. Prof. Macbride has seen 

 the type of P. relatum Morg., and considers it to be a delicate form of the 

 present species. 



Hab. On dead wood. — Poland (Strassb. Herb.) ; Sweden (B.M. 

 2100) ; Switzerland (B.M. 2101) ; Bohemia (B.M. 2102) ; Bonin 

 Islands (K. 333) ; Borneo (B.M. 1200a) ; New Zealand (B.M. 2104) ; 

 Philadelphia (B.M. 1202); Ohio (B.M. 1199); Iowa (B.M. 1015); 

 Japan (B.M. 2103). 



7. P. pulcbripes Peck in Bull. Buff. Soc. N. Hist., i. 64 

 (1873). Plasmodium ? Total height 1 to 2 mm. Sporangia 

 stalked, globose, yellow-orange, orange-red to dark brown, 

 sometimes grey from the absence of lime, about 0*5 mm. diam. ; 

 sporangium- wall membranous, with deposits of lime usually 

 abundant, sometimes scanty. Stalk vermilion-red or red- 

 brown, 0*5 to 1*5 mm. long, - l mm. thick, somewhat narrowed 

 upwards, densely charged with red or brown lime-granules, 

 brittle. Columella conical. Capillitium with red or reddish- 

 brown lime-knots, in other respects as in P. globuliferum. 

 Spores violet-brown, almost smooth, 6 to 8 //. diam. — Mass. 

 Mon., 315. P. Petersii Berk. & Curt, in Grev., ii. 66 

 (1873) ; Mass. I.e., 295, in part. P.Ravenelii Mass. I.e., 281. 

 P. rufipes Macbr. N. Am. Slime-Moulds, 50 (1899). Didymium 

 erythrinum Berk, in Grev., ii. 52 (1873) ; Mass. I.e., 249. 

 D. Ravenelii Berk. & Curt, in Grev., ii. 53. Cytidium rufipes 

 Morg. Myx. Miami Valley, 81 (1896). 



PI. 17. — a. sporangia ; b. capillitium and spores ; c. spore ; (Philadelphia.) 

 A frequent species in the United States, differing from P. globuli- 

 ferum chiefly in the red colour of the lime ; this character appears to 

 be constant. Prof. Macbride has named the present species P. rufipes. 



