196 THE MYXOMYCETES 



1.2 mm. in length; columella reaching half way to the summit and 

 giving rise to the pallid or hyaline, branching columella; spores dark 

 purple, strongly spinulose, 12-15 /x. 



A very distinct species, the sporangia when full of spores marked 

 by a network of silvery blue over black. The nearly transparent wall 

 often remains in large part after spore discharge. We have seen no 

 American examples. 



Rare: Colorado, ace. to Lister; Europe. 



8. Lamproderma carestice (Ces. & de Not.) Meylan 



Bull. Soc. Vaud. Sc. Nat. 57 : 368. 1932. 

 PI. XIII, Figs. 316, 317. 



1879. Stemonitis carestice Ces. & de Not., Erb. Crit. Ital. No. 888. 

 1894. Lamproderma violaceum Rost. var. carestice List., Mycetozoa 130. 

 1917. Lamproderma sauteri Rost. var. carestice Meylan, Bull. Soc. Vaud. Sc. 

 Nat. 51 : 264. 



Sporangia sessile, ovate, smaller above, 13^-2 times as tall as broad, 

 violet-blue with shining metallic tints above; columella cylindrical, 

 about half the height of the sporangium; capillitium dense, dark; 

 spores papillate, 11-14 /x. 



Distinguished from L. sauteri by the elongated, sessile sporangia, the 

 dense dark capillitium and the paler spores which average somewhat 

 smaller. 



Europe. 



9. Lamproderma violaceum (Fr.) Rost. 



Vers. 7. 1873. 

 PL XIII, Figs. 318, 319. 



1829. Stemonitis violacea Fr., Syst. Myc. 3 : 162, non Roth 1788, nee Schum. 



1803. 

 1882. Lamproderma nigrescens Sacc, Michelia 2 : 262, non Rost. 

 1892. Lamproderma saccardianum Massee, Mon. 101. 

 1892. Tilmadoche berkeleyi Massee, Mon. 332. 



Sporangia closely gregarious or scattered, depressed-globose, more 

 or less umbilicate below, metallic blue or purple, sessile or short- 

 stipitate, 0.3-1 mm. in diameter; stipe usually rather stout, dark 

 brown or black, even; hypothallus, when the sporangia are crowded, 

 a thin, continuous, purplish membrane, when the sporangia are scat- 

 tered, discoidal; columella cylindric or tapering slightly upward, the 

 apex obtuse, black, attaining the center of the sporangium; capil- 

 litium lax and flaccid, made up of flexuous threads branching and 

 anastomosing to form a network, open in the interior, more dense 



