128 Mycetozoa of North America 



columella, and capilHtium may vary in color, and the form of the 

 capillitlum may be different in otherwise similar collections. The 

 spores occasionally are very dark and coarsely spinose, appearing 

 in those respects somewhat like the spores of D. intermedium, a 

 related species, but the latter is distinguished by the shape of the 

 sporangia, and the long, tapering stalks. Many of the variations 

 have been regarded as distinct species in the past, although now 

 it is generally admitted that they are all phases of the same 

 form. The species often forms thin, effused or netted plasmodio- 

 carps, without a columella, which if accompanied by normal 

 sporangia may be readily recognized. If not, the determination 

 is more difficult, as they may appear like plasmodiocarps of 

 D. anellus or some other species of Didymium. Var. claviforme 

 Sturg. (Colo. Coll. Pub. Sc. Ser. 12: 27. 1907), from Colorado, 

 is hardly worthy of recognition. It is one of the numerous varia- 

 tions of the species that may occur. 



14. Didymium Sturgisii Hagelstein, Mycologia 29: 397. 1937. 



Didymium anomalum Sturg. Colo. Coll. Pub. Sc. Ser. 12: 444. 1913. (N. 

 Y.B.G. no. 13109, type.) Kot D. anoinalum (Rost.) Massee. 1892. 



Plasmodium? Sporangia forming very thin, white or grayish 

 white, rounded or irregularly shaped, effused plasmodiocarps up 

 to 10 mm. across, 0.1 to 0.2 mm. thick, rough, pitted, or wrinkled; 

 sporangial wall membranous, hyaline or yellowish, sprinkled 

 with white or grayish, angular or stellate crystals of lime. Colu- 

 mella none. CapilHtium of numerous, hyaline tubes, widely 

 expanded for the greater part, and enclosing crystals of lime, 

 terminating in short, slender threads attached to the upper and 

 lower sporangial walls. Spores violet-brown, 10-12 fu. diam., 

 minutely warted, with some of the warts arranged in clusters. 

 (Plate 10, fig. 1.) 



Type locality: Colorado. 



Habitat: On dead bark. 



Distribution: Colorado, Iowa, Minnesota, *Montana, New 

 Jersey, New York, Pennsylvania. 



Illustration: Lister, Mycetozoa ed. 3. pi. 213, as D. ano- 

 malum. 



The widely expanded threads of the capilHtium are filled 

 with lime-crystals, and form columns connecting the top of the 

 plasmodiocarp with the base. They are weakly attached with 



