DiANEMA 267 



Spores in mass pale pinkish gray, becoming yellowish with age, 

 nearly colorless by transmitted light, minutely warted, 8-13 n 

 diam. 



Type locality: England. 



Habitat: On dead wood. 



Distribution: *California, Colorado, *Iowa, Kansas, New 

 Hampshire, *New York, *Nova Scotia, Oregon, Pennsylvania, 

 Quebec, ^Washington. 



Illustration: Lister, Mycetozoa ed. 3. pi. 196. 



The species was found repeatedly in upper Quebec, near Lake 

 St. John, in August 1938, but is not collected often. The develop- 

 ments range from sporangia to large, broad plasmodiocarps, the 

 latter usually showing the primary sporangial formation. Varie- 

 ties based on the plasmodiocarpous forms are hardly worth 

 recognizing. 



Genus 46. DIANEMA Rex, Proc. Acad. Nat. Sc. Phila. 

 1891:397. 1891. 



Sporangia sessile or forming plasmodiocarps; sporangial wall 

 membranous or cartilaginous; capillitium consisting of nearly 

 straight slender threads, attached above and below to the sporan- 

 gial wall. 



Type species: Dianema Harveyi Rex. 



Sporangial wall membranous, translucent; spores free. 



Threads of capillitium nearly simple, attached to the 



sporangial wall by short branches. 1. D. Harveyi 



Threads of capillitium branching freely above. 2. D. nivale 



Plasmodiocarps broad; threads of capillitium rigid, at- 

 tached by acuminate extremities to the sporangial 

 wall; spores reticulate. 3. D. depressum 



Plasmodiocarps with cartilaginous walls; spores clustered. 4. D. corticatum 



1. Dianema Harveyi Rex, Proc. Acad. Nat. Sc. Phila. 1891: 397. 

 1891. 



Plasmodium white (Lister). Sporangia solitary or in small 

 clusters, sessile, and subglobose, hemispherical, or cushion-shaped, 

 flattened above, 0.5 to 2 mm. diam., 0.35 to 1 mm. high, some- 

 times elongate and bent into an irregular horseshoe shape, dull 

 red or gold-bronze, shining; sporangial wall membranous, thin, 

 translucent, pale purplish or olivaceous, marked with the per- 

 sistent ends of the capillitium when the rest of the threads have 



