Physarum 51 



dark gray from absence of lime, smooth or rugulose; sporangial 

 wall membranous, usually with evenly distributed lime-deposits, 

 thicker at the base. Stalk cylindrical from a broader base, 

 rugulose, flesh-colored or pinkish, translucent, or opaque with 

 refuse matter, 0.2 to 0.5 mm. high. Capillitium a dense network 

 of fragile, angular, branching, white lime-knots with short con- 

 necting threads. Spores purplish brown, spinulose, with a paler, 

 smoother area of dehiscence, 8-9 /x diam. 



Type locality: Colorado. 



Habitat: On dead wood and twigs. 



Distribution: California, Colorado, *Montana, *Oregon, 

 *Washington. 



Illustration: Lister, Mycetozoa ed. 3. pi. 204. 



Certain phases of P. ohlatum or Crateriiim leucocephalum var. 

 scyphoides may be confused with P. carneum, but the spores and 

 short, pinkish stalks of the latter are characteristic. P. citrinel- 

 lum is a larger form with usually prominent, double walls and 

 stout stalks. A collection made by W. C. Blasdale, in California 

 in 1893, is the present species. (N. Y. B. G. no. 5709.) 



27. Physarum brunneolum (Phill.) Massee, Mon. 280. 1892. 

 Diderma brunneolum Phill. Grevillea 5: 114. 1877. 



Plasmodium yellow (Lister). Sporangia globose to subglo- 

 bose and slightly depressed, 0.6 to 1.7 mm. diam., stalked or 

 sessile, rarely forming plasmodiocarps, gregarious, yellow-brown 

 to brown, glossy; sporangial wall dehiscing in revolute lobes, or 

 breaking up into fragments, consisting of two layers, the outer 

 yellowish brown, cartilaginous, the inner membranous, enclosing 

 abundant deposits of white lime-granules. Stalk firm, cylindri- 

 cal, red-brown or nearly black, without lime, 0.1 to 0.4 mm. high. 

 Capillitium a network of colorless threads with numerous, large, 

 irregular, white lime-knots, combined occasionally to form a 

 pseudo-columella. Spores purplish brown, spinulose, 8-10 fx 

 diam. 



Type locality: California. 



Habitat: On dead wood. 



Distribution: California, Colorado, *Montana. 



Illustration: Lister, Mycetozoa ed. 3. pi. 69. 



This species is based upon a collection made by Harkness in 

 California in 1877. It is rare, and has been collected infrequently 



