252 Mycetozoa of North America 



reddish brown, filled with spore-like cells. Capillitium a rather 

 close, elastic network of flattened or terete pale red threads 2-5 fi 

 diam., with thickenings in the form of prominent cogs or spines 

 and half-rings arranged in a loose spiral; with many attachments 

 to the cup and usually without free ends. Spores pale red, nearly 

 smooth, marked with a few scattered warts, 6-8 n diam. (Plate 

 16, FIG. 14.) 



Type locality: Europe. 



Habitat: On dead wood. 



Distribution: Common and abundant throughout North 

 America. 



Illustration: Lister,- Mycetozoa ed. 3. pi. 174. 



This common species is also very variable and connected by 

 intermediate forms with A. incarnata. Very small forms ap- 

 proach A. insignis. 



8. Arcyria insignis Kalch. & Cooke; Kalch. Grevillea 10: 143. 

 1882. 



Plasmodium watery white (Lister). Total height 0.5 to 1.5 

 mm. Sporangia stalked, gregarious, or clustered in small, scat- 

 tered groups, ovoid or cylindrical, 0.3 to 0.4 mm. diam., flesh- 

 colored or pink; cup of sporangium delicately membranous, 

 plaited, nearly smooth or reticulate and spinulose. Stalk thick- 

 ened upwards, furrowed, 0.2 to 0.4 mm. long, red, filled with 

 spore-like cells. Capillitium a close, elastic network of pale pink, 

 delicate threads 2-3 /x diam., usually with a few bulbous free ends, 

 flattened, marked with transverse bands and short spines ar- 

 ranged in a lax spiral, closely and minutely spinulose or nearly 

 smooth elsewhere. Spores almost colorless, nearly smooth, 6-8 y. 

 diam. 



Var. dispersa Hagelstein, Mycologia 21: 298. 1929. (N. Y. B. G. no. 1272, 

 type.) 



Sporangia solitary, scattered; otherwise as in the typical form. 

 (Plate 14, fig. 4.) 



Type locality: Africa, probably. 



Habitat: Usually on pithy stalks, occasionally on dead wood; 

 var. dispersa, on dead leaves and stems. 



Distribution: *Canal Zone, *Indiana, Iowa, Kansas, Massa- 

 chusetts, New Hampshire, New Jersey, New York, *Oregon, 

 Pennsylvania, Quebec, *Washington; var. dispersa, New York. 



