Physarum 69 



The species is easily recognized by the parallel walls dehiscing 

 along the ridge. Sometimes the species forms rounded plasmo- 

 diocarps like P. hitectum, but the latter has larger and smoother 

 lime-knots, and larger and darker spores. Yellowish or yellowish 

 brown forms approach P. bogoriense and are sometimes difficult 

 to separate if the manner of dehiscence is obscure. 



43. Physarum bogoriense Racib. Hedwigia 37: 52. 1898. 



Plasmodium? Sporangia scattered or gregarious, sessile on a 

 narrow base, subglobose, ovoid and angular at the top, or forming 

 flexuose plasmodiocarps, reddish brown, yellow, or nearly white; 

 sporangial wall of two layers, the outer smooth, white on the 

 inside, charged with white lime-granules, usually marked with 

 pale lines of dehiscence, and breaking away in reflexed lobes from 

 the inner, persistent, membranous wall. Capillitium of numerous 

 white, smooth-walled, rounded or branching lime-knots, small or 

 large, connected b>' hyaline threads. Spores violet-brown, spin- 

 ulose, 8-10 /i diam. 



Type locality: Java. 



Habitat: On dead leaves and ground matter. 



Distribution: Antigua, *California, *Canal Zone, Colorado, 

 Florida, Louisiana, New York, North Carolina, Ontario, Penn- 

 sylvania, Puerto Rico, Quebec, *Saint Croix, South Carolina, 

 Virginia. 



Illustration: Lister, Mycetozoa ed. 3. pi. 50. 



When prominent, the manner of dehiscence by reflexed lobes 

 is characteristic of this species. It may be otherwise, longitu- 

 dinally along the sharp, upper edges of the plasmodiocarps, the 

 sides separating from the inner walls. The spores and lime-knots 

 are similar to those of P. bivalve, but the lime-knots are smooth. 



49. Physarum bitectum Lister, Mycetozoa ed. 2. 78. 1911. 



Physarum Diderma Lister, ]our.Bot. 29: 260. 1891. (N.Y.B.G.nos. 11813, 

 11816, authentic material.) Not P. Diderma Rost. 1874. 



Plasmodium white (Lister). Sporangia scattered, sessile, sub- 

 globose or obovoid, 0.6 to 0.8 mm. diam., or forming curved or 

 flexuose plasmodiocarps 2 to 6 mm. long, rounded or slightly 

 compressed laterally, smooth, white or bufl", sometimes purplish 

 brown below from absence of lime, or entirely limeless; sporangial 



