102 A Monograph of the Myxogastres. 



sporangium, apex rather obtuse ; branches of the capillitium 

 springing from apex of columella, dichotomously branched, fili- 

 form, fuliginous; spores globose, 9 10 /* diameter, pale smoky- 

 violet, minutely echinulate. 



Lamproderma nigrescens, Sac., Michelia, II., p. 262; Sacc., 

 Syll., vii., 1, no. 1354 (not of Host.). 



On fallen leaves of Buxus, Robinia Pinus, heaps of chips, &c. 

 Selva, N. Italy. 



Distinguished from L. physarioides by its smaller size and 

 smaller spores, and from L. violaceum by the black spherical 

 sporangium, etc. (Sacc.) 



Saccardo's name is antedated by Rostafinski's. 



Lamproderma arcyrioides, Rost. (figs. 145 148). 



Gregarious or scattered, springing from a firm hypothallus; 

 sporangia globose, shortly elliptical or obovate, wall thin, 

 blackish, with blue, purple, green, or reddish metallic tints ; 

 stem usually becoming thinner upwards, blackish, shining, 

 sometimes obsolete, passing directly into the sporangium as 

 a short columella that breaks up at the apex into several 

 equal, ascending branches, these again produce numerous lateral 

 brandies, at some distance from the base, that anastomose laterally 

 and form a dense, irregular network, threads pale greyish- 

 brown; spores globose, dirty violet, minutely warted, 11 16 p 

 diameter. 



Lamproderma arcyrioides, Host., Mon., p. 206 ; Cke., Myx. 

 Brit., p. 50 ; Sacc., Syll., vii., n. 1353. 



E,Ksicc. Rab., Herb. Myc., 431; Roum., Fung. Gall., 908; 

 FuckeL, Fung. Rhen., 1447 ; Rab., Fung. Eur., 797. 



On rotten wood, dead leaves, &c. Britain (New Forest, 

 Scarborough, Carlisle); France; Germany; Sweden; Denmark; 

 United States. 



From l - 5 3 mm. high. Near to L. violacea, but dis- 

 tinguished by the larger and more coarsely warted spores, and 

 in the main branches of the capillitium remaining unbranched 

 for some distance at the base. 



