286 A Monograph of the Myxogastres. 



threads of capillitium hyaline, here and there with irregular 

 swellings containing lime, internodes long, slender, some of the 

 nodes empty ; spores globose or angularly subglobose, 11 13 /* 

 diameter, blackish-violet, minutely verruculose. 



Physarum nefroideum, Host., Mon., p. 93, figs. 80 82 ; Cke., 

 Brit. Myx., figs. 8082. 



Physarum compressum, Sacc., Syll., vii., 1, n. 1167. 



On leaves, rotten wood, &c. Britain (Lyndhurst, New 

 Forest) ; Germany ; Italy. 



Closely allied to P. Phillipsii, but differing in the structure 

 of the capillitium, the nodes containing lime are much smaller, 

 the internodes long and slender, and many of the nodes are 

 empty and collapsed, or contain air only and not lime. 



Physarum candidum, Host, 



Sporangia strictly or irregularly globose, sessile or stipitate, 

 dehiscjg irregularly, wall charged with lime, snow-white ; stem 

 white, elongated, plicate, 1 mm. high, rigid, crustaceous, capillitium 

 with snow-white roundish nodes containing lime; spores pale 

 violet, muricate, 12 15 p diameter. 



Physarum candidum, Host., Mon., p. 96; Sacc., Syll., vii., 1, 

 n. 1170. 



On rotten wood. Juan Fernandez. 



Physarum simile, Rost. 



Gregarious, stipitate, sporangia globose, grey, densely covered 

 with small white lumps of lime, rigid ; stem usually twice as 

 long as sporangium, equal, or slightly thickened below, and 

 passing into a small, orbicular hypothallus, yellmvish, sometimes 

 with a pink tinge, rigid, filled with particles of lime, usually 

 longitudinally wrinkled ; columella subcylindrical, whitish, one- 

 fourth the height of the sporangium or less; capillitium dense, 

 threads thin, colourless, forming an irregular network, swellings 

 of nodes or interstitial parts small, elliptical or triangular, with 

 colourless or yellowish granules of lime ; spores dingy lilac, very 

 minuted vcmiculose, 7 8 /* diameter. 



