132 THE MYXOMYCETES 



hyaline threads, branched and anastomosing toward the extremities; 

 spores pale brownish purple, faintly spinulose, 8-10 ix. 



New York, Colorado; Europe. 



Var. album G. Lister (= Chondrioderma radiatum var. album Tor- 

 rend), with white or bluish white sporangia and white or creamy 

 columellae, and var. roseum Meylan, with pale pink sporangia and 

 stalks and dull pink columellae, occur locally in Europe. 



14. Diderma sauteri {Rost) Macbr. 



N. A. Slime-Moulds 103. 1899. 



1875. Chondrioderma sauteri Rost., Mon. 181. 



1891. Chondrioderma aculeatum Rex, Proc. Acad. Nat. Sc. Phila. 390. 



Sporangia scattered, gregarious, sessile, lenticular or hemispherical, 

 flattened above and sometimes concave or umbilicate below, pale 

 brownish or pinkish gray or dull ochraceous, the outer peridium 

 papyraceous, thin, occasionally wrinkled, rupturing irregularly, re- 

 mote from the inner, which is thin, delicate, semi-transparent, grayish, 

 rarely iridescent; hypothallus none; columella irregular, sometimes 

 small and hardly evident, rugose, with spine-like processes, the per- 

 sisting bases of the capillitial threads reddish brown ; capillitium scanty, 

 white or colorless, simple or sparingly branched; spores dark violaceous, 

 spinulose, 12-13 fi. 



After careful comparison of specimens and various descriptions, 

 especially that of Rostafinski, with the type specimens of Rex, we 

 concur with Lister in adopting Rostafinski's name. The sporangia in 

 Rex's type specimens are on moss, borne at the extreme tips of acu- 

 minate or aculeate leaves, so that at first sight they appear stipitate. 



Apparently rare. Maine, New York; Europe. 



15. Diderma ochraceum Hojfm. 



Deutsch. EL Crypt. PI. 9, Fig. 2 b. 1795. 



1804. Reticularia ochracea (Hoffm.) Poir., Lam. Encycl. 6 : 182. 



1885. Chondrioderma ochraceum Schroet, Cohn Krypt. Fl. Schles. 3 (1) : 124. 



Sporangia gregarious or clustered, 0.7-1 mm., sessile, globose or some- 

 times plasmodiocarpous, ochraceous or olivaceous, yellow; outer wall 

 cartilaginous with yellow deposits of lime, the inner also yellow, adher- 

 ent or free; columella not distinct; capillitium simple or branching, 

 purple-brown, hyaline at base; spores spinulose, purplish gray, 9-11 p. 



Brandza states that when the sporangia mature under dry condi- 

 tions the wall is single and the fructifications resemble sessile forms of 

 Lepidoderma tigrinum. 



Reported from Massachusetts; also Europe, Japan. 



