Lamproderma 177 



colorless at the tips. Spores dark purplish brown, 11-18 n diam., 

 regularly reticulate with narrow, raised bands, that form a net 

 with from 8 to 24 meshes on the hemisphere, and show as a border 

 0.5-1.5 n wide. 



Type locality : Germany. 



Habitat: On herbaceous stalks (Colorado collection). 



Distribution: Colorado. 



Illustration: A^Iacbr. & Martin, Myxomycetes pi. 13, figs. 

 309, 310. 



The only American collection was by Dr. Fred J. Seaver, 

 Curator of the New York Botanical Garden, associated with 

 P. J. Swope, at Middle Boulder, Colorado, in July 1929. The 

 collection is typical, with finely reticulate spores. 



8. Lamproderma atrosporum Meylan, Bull. Soc. Vaud. Sc. Nat. 

 46:51. 1910. {N.Y.B. G. nos. 7247, 8046, 11335, authentic 

 material.) 



Plasmodium black (Meylan). Sporangia scattered or clus- 

 tered, subglobose or ovoid, stalked or sessile, glossy purple-black 

 with silvery or iridescent reflections, 0.8 to 1.4 mm. diam.; sporan- 

 gial wall purplish, at length breaking up into fragments. Stalk 

 black, 0.1 to 1 mm. high, on a dark membranous hypothallus. 

 Columella cylindrical or clavate, about half the height of the 

 sporangium. Capillitium consisting of nearly black or purple- 

 brown threads, branched and anastomosing, slightly flexuose or 

 closely crisped, dark to the tips of the branchlets, which are often 

 thickened and adhere to the sporangial wall. Spores brownish 

 purple or purplish gray, 11-15 /i diam., either closely and min- 

 utely spinulose or marked with scattered spines, or more or less 

 completely reticulate with rows of minute warts or raised bands. 



Type locality: Switzerland. 



Habitat : On dead leaves, twigs, and stems. 



Distribution: California, *Oregon, Quebec, Utah. 



Illustration: Lister, Mycetozoa ed. 3. pi. 133, figs. f-i. 



Dr. C. L. Shear found this species in the Yosemite Valley of 

 California in 1915. The spores are beautifully reticulate with 

 spines. Another collection by Dr. J. W. Groves, at Burnet, 

 Quebec, in 1939, has the spines more or less confluent, forming a 

 broken reticulation of raised ridges accompanied by spines. In 

 the Utah specimen, collected by S. J. Harkness in 1881, the spores 

 are spinulose. These specimens illustrate the variation in the 



