46 A Monograph of the Myxogastres. 



oval ball-shaped clusters of from 5 25. Only the convex surface 

 warted, 11 12 /u, diameter. 



Enteridium Rostrupii, Raunk., Myx. Dan., p. 1 06 (in English). 



On fir-stumps and rotten oak branches autumn. 



Denmark. 



From the above description alone it is difficult to indicate 

 the points of difference between the present species and E. 

 olivaccum. 



Enteridium macrosporum, Raunk. 



Aethalia hemispherical, 2 mm. diameter, at first reddish, later 

 olive. Spores in oval ball-shaped clusters of from 5 25. 

 Only the convex surface spinulose, 12 14 /x diameter. 



Entcridiuin macrosporum, Raunk., Myx. Dan., p. 106, t. 2, 

 f. 1. 



On rotten fir branches. Autumn. Near Copenhagen. 



This species I have only found once, and then but very few 

 specimens. It seems to be especially different from the other 

 species of Enteridiitm in the size of the spores and the par- 

 ticularly developed sculpture of their convex surface. (Raunk.) 



Enteridium Rozeanuni, Wing. (f. 108). 



Aethalium of irregular shape, globose, ovoid, or rounded- 

 pyramidal, attached to the substratum by a wide base. Vari- 

 able in size, from 5 30 mm. in diameter. Cortex and mass 

 of spores ferruginous brown; occasionally the cortex shining; 

 sometimes membranaceous, pellucid. Interior structure very 

 variable, the walls of the individual sporangia (which form a 

 capillitium) membranaceous, pellucid, band-like, combined into 

 an all-sided network attached uniformly to all sides of the 

 cortex. The bands have triangular or polygonal expansions 

 at the angles where they join each other. Spores globose, 

 about two-thirds of the surface covered with a delicate, regular, 

 fine-meshed network, the remainder with simple warts or 

 elongated ridges. The warted portion has the outline of a 

 wide spindle lying at the poles of the little sphere. Spores 

 measure 7'5 9 /x. 



