262 THE MYXOMYCETES 



2. Lachnobolus globosus (Schw.) Rost. 



Mon. 283. 1875. 

 PI. XVIII, Figs. 466, 467. 



1822. Arcyria globosa Schw., Schrift. Naturforsch. Ges. Leipzig. 1 : 38. 



1829. Craterium globosum (Schw.) Fr., Syst. Myc. 3 : 154. 



1894. Arcyria albida Pers. var. globosa (Schw.) List., Mycetozoa 186. 



Sporangia globose, stipitate, 0.5-1.5 mm. tall, cinereous to pale 

 yellowish, solitary or in small clusters; stipe 0.3-0.7 mm. long, con- 

 colorous, hollow, filled with spore-like cells; peridium very fragile, 

 colorless, papillose or almost smooth, evanescent above, leaving the 

 cup-like lower portion as a calyculus; capillitium pallid, not at all or 

 only slightly elastic, the threads 3.5-4.5 \x in diameter with nodes only 

 slightly swollen, seldom over 10 /* across, densely warted, connected 

 with the peridium by frequent arms; spores pallid, very minutely 

 spinulose, with a few scattered warts, globose or slightly angled as a 

 result of mutual pressure, 7-8.5 \x. 



Rostafinski placed this species in the genus Lachnobolus because of 

 the non-elastic capillitium. Miss Baskerville (1932), after studying 

 the abundant material in the University of Iowa herbarium, concluded 

 that its affinities are with Arcyria, where it is placed in the English 

 monograph. 



Eastern United States, usually on fallen catkins and burs of Castanea 

 dentata and C. pumila and coextensive in range with these hosts. 

 Also reported from Washington on an alder catkin and from Ceylon 

 on dead leaves. 



3. Lachnobolus occidentalis Macbr. 



N. A. Slime-Moulds 188. 1899. 

 PI. XVIII, Figs. 476, 477. 



1892. Lachnobolus incarnatus (Alb. & Schw.) Schroet. ex Macbr., Bull. Lab. 



Nat. Hist. Iowa 2 : 126. 

 1911. Arcyria occidentalis (Macbr.) List., Mycetozoa ed. 2. 245. 



Sporangia globose to ellipsoidal, sessile or short-stipitate, 0.5- 

 2.5 mm. tall, at first rosy, then brown or ochraceous, crowded and 

 often more or less distorted, but not heaped; stipe 0-1.5 mm. long, 

 concolorous to dark red-brown, hollow, filled with spore-like cells; 

 peridium shining with a metallic luster, very fragile in upper portion, 

 often with the sides thickened into four or five lobes where it has been 

 in contact with neighboring sporangia, these lobes remaining after 

 the more fragile upper part has disappeared ; calyculus below the lobes 

 ribbed or fluted, with frayed edges where the lobes have not formed 



