238 Mycetozoa of North America 



Illustration: Lister, Mycetozoa ed. 3. pi. 165, figs. a-c. 



The species has a tendency to develop in dark, wet places, and 

 may be sought under decaying logs with a moist base beneath. 

 Both species of the genus show much variation in the length of the 

 elaters, which are often branched. 



Genus 40. CALONEMA Morgan, Jour. Cin. Soc. Nat. Hist. 

 16:27. 1893. 



Resembling Oligonema except that the threads of the capilli- 

 tium are combined to form a network. 

 A SINGLE SPECIES. 



1. Calonema aureum Morg. Jour. Cin. Soc. Nat. Hist. 16: 27. 

 1893. (N. Y. B. G. no. 11246, type material.) 



Plasmodium? Sporangia sessile, clustered, subglobose, 0.3 to 

 0.6 mm. diam., shining yellow; sporangial wall membranous, 

 yellow, translucent, marked with delicate lines of thickening 

 forming an irregular net resembling fan-tracery, with thinner 

 spots from which the lines radiate. Capillitium consisting of 

 branching yellow threads 3-5 n diam., more or less united to form 

 a network, and marked with raised lines, or rows of minute warts 

 arranged to form either an irregular reticulation, or irregular 

 spirals which are usually dextral but may be sinistral; ring-shaped 

 thickenings and scattered spines often present. Spores yellow, 

 13-15 ju diam., regularly reticulate with narrow raised bands, 

 which give a border of 1-1.5 m to the margin, and form a net 

 showing five to six meshes across the hemisphere. 



Type locality: Ohio. 



Habitat: On dead wood. 



Distribution: *Alabama, *Arkansas, Florida, *Illinois, 

 *Maryland, *Minnesota, North Carolina, Ohio, *South Carolina, 

 Tennessee, Virginia. 



Illustration: Lister, Mycetozoa ed. 3. pi. 165, figs. d-f. 



The form is practically the same as Oligonema flavidum, except 

 that the capillitium is much branched and combined somewhat 

 into a network varying in each collection. The spirals are not 

 always dextral, but may be sinistral, sometimes both directions in 

 a single sporangium. This may also be seen in the genus Oligo- 

 nema as the direction depends on the arrangement of the indi- 

 vidual warts. The spirals are not continuous thickenings as in 



