216 Mycetozoa of North America 



yellow by transmitted light, spinulose, 9-12 ^ diam. (Plate 13, 

 FIG. 1.) 



Type locality: Denmark. 



Habitat: On dead wood. 



Distribution: Throughout North America, and not un- 

 common. 



Illustration: Lister, Mycetozoa ed. 3. pi. 152. 



Darker forms, lead-colored to nearly black, are occasionally 

 found, and are due to the presence of refuse matter. Reddish 

 forms, not rare, are due to incomplete maturity. The aethalia, 

 particularly the larger ones, have a habit of splitting, with many 

 cracks, on drying, eventually breaking into tufts of sporangia for 

 better dispersal of the spores. Early developments are usually 

 small, but later in the season, in October, they may be very large 

 and of many aethalia. 



Genus 34. ENTERIDIUM Ehrenberg, Jahrb. Gewachsk. 

 1(2): 55. 1819. 



Aethalium composed of confluent interwoven sporangia, their 

 walls perforated with large openings; sporangia more or less evi- 

 dent; capillitium none. 



Type species: Enteridiiun olivaceum Ehrenb. 



Spores war ted. 



Aethalia usually 1 cm. diam. or more. 1. E. olivaceum 



Aethalia 1 to 2 mm. diam. 2. E. minuttim 



Spores reticulate; aethalia large. 3. E. Rozeanum 



1. Enteridium olivaceum Ehrenb. Jahrb. Gewachsk. 1 (2): 57. 

 1819. 



Plasmodium rose-red (Lister). Aethalium pulvinate, de- 

 pressed, 1 mm. to 3 cm. long, 1 to 3 mm. thick, smooth or rugulose, 

 dark olive-brown, rarely dark bluish green, often glossy; sporan- 

 gial walls yellow-olive, or dark green, membranous, perforated 

 with wide openings forming a network or pseudo-capillitium with 

 broad winged boundaries to the meshes. Spores in clusters of 

 6 to 20, sometimes free, pale olive or brown, thickened and warted 

 on one side, 9-12 /x diam. 



Type locality: Germany. 



Habitat: On dead wood. 



Distribution: *California, New Hampshire, New Jersey, 

 New York, *Oregon, Washington. 



