DIDYMIUM 107 



yellowish, poorly developed or obsolete; spores dark blackish purple, 

 almost opaque, distinctly and coarsely spiny, 12-15 p. 



The scaly outer wall is distinctive. A collection submitted by 

 M. Meylan is certainly distinct from D. dubium (= D. wilczekii). 



Swiss Alps. 



2. Dedymium fulvum Sturgis 



Mycologia 9 : 327. 1917. 

 PL VIII, Fig. 175. 



Sporangia gregarious, sessile, elongate or forming curved plasmodio- 

 carps, sometimes confluent, rarely subglobose, concave beneath, pale 

 raw umber in color, 0.5-0.8 mm. in width, occasionally seated on a 

 concolorous, membranous, lime-encrusted hypothallus which may form 

 pseudo-stalks; sporangium wall membranous, stained with yellow 

 blotches, thickly sprinkled with clusters of large acicular crystals of 

 pale yellowish lime; columella very much flattened or obsolete; cap- 

 illitium an abundant network of delicate, almost straight or flexuose, 

 pale purple or nearly hyaline threads, frequently with dark, calyciform 

 thickenings as in Mucilago, and occasionally showing fusiform, crystal- 

 line blisters; spores dark purplish brown, coarsely tuberculate, the 

 tubercles usually arranged in curved lines, paler and smoother on one 

 side, 12.5-14.5 /*. 



Colorado. 



3. Dedymium ochroedeum G. Lister 



Jour. Bot. 69:297. 1931. 



Sessile, pulvinate or forming slender plasmodiocarps 0.5 mm. broad, 

 pale brown or ochraceous, slightly grooved; wall pale orange, thickly 

 clothed with stellate crystals, sometimes divided into small areolae, 

 each with a darker raised center to which a crystal adheres; hypothallus 

 scanty, yellowish red; floor orange colored with scanty deposits of 

 lime forming a low columella; capillitium a loose network of slender, 

 pale purplish threads; spores pale purplish gray, nearly smooth, 5-7 /*. 



Resembling D. fulvum, differing in the more slender plasmodiocarps, 

 the delicate capillitium and the small, pale, nearly smooth spores. 



New York; India, Japan. 



4. Dedymium complanatum (Batsch) RosL, non Fuck. 1869 



Mon. 151. 1875. 

 PI. VII, Figs. 151, 152, 153. 

 1786. Lycoperdon complanatum Batsch, Elench. Fung. Cont. 1 : 251. 



Fructification plasmodiocarpous, creeping, flattened, thin, vein-like, 

 annulate or reticulate, the dark colored peridium covered with white, 



