130 THE MYXOMYCETES 



11. Diderma testaceum {Schrad) Pers. 



Syn. Meth. Fung. 167. 1801. 

 PI. IX, Figs. 194, 195. 



1797. Didymium testaceum Schrad., Nov. Gen. Plant. 25. 



1827. Cionium testaceum Spreng., Syst. Orb. Veg. 4 : 529. 



1869. Diderma cubense Berk. & Curt., Jour. Linn. Soc. 10 : 347. 



1873. Chondrioderma testaceum (Schrad.) Rost., Vers. 13. 



1873. Diderma sublateritium Berk. & Br., Jour. Linn. Soc. 14 : 82. 



1874. Diderma marice-wilsoni Clinton, Rept. N. Y. State Mus. 26 : 74. 

 1876. Chondrioderma sublateritium (Berk. & Br.) Rost., Mon. App. 19. 

 1876. Chondrioderma cubense (Berk. & Curt.) Rost., Mon. App. 19. 



Sporangia gregarious, sessile, depressed-spherical or sometimes elon- 

 gate, small, 1 mm. or less, rose-white, smooth, the outer peridium 

 crustaceous, rather thick and persistent, polished, slightly raised above 

 the inner, which is dull ashen and more or less wrinkled; hypothallus 

 none; columella prominent, hemispherical in the typical rounded forms, 

 slightly rough, reddish or reddish alutaceous; capillitium usually 

 abundant, of slender, delicate, pale or colorless threads, little branched, 

 smooth; spores violaceous brown, minutely roughened, 8-9 /x. 



Easily recognized when fresh by its delicate pink or roseate color; 

 weathered specimens tend to become white, and might be confused 

 with forms of D. effusum, but the sporangia in the present species 

 are less flattened and only rarely and in special situations exhibit the 

 linear or plasmodiocarpous shapes characteristic of D. reticulatum. 

 All our specimens from the west are on dead leaves of oak; eastern 

 gatherings are on moss, beech, maple and aspen leaves and occasionally 

 on woody debris. 



Not common but widely distributed — New England to Washington, 

 California, South Carolina; Europe, North Africa, Japan, Ceylon. 



12. Diderma hemisphcericum {Bull) Hornem. 



Fl. Dan. 33 : 13. 1829. 

 PL IX, Figs. 196, 197. 



1791. Reticularia hemisphcerica Bull., Champ. 93. 



1803. Physarum depressum Schum., Enum. PI. Saell. 2 : 202. 



1804. Reticularia contorta Poiret, in Lam. Encycl. 6 : 182. 

 1829. Didymium hemisphcericum (Bull.) Fr., Syst. Myc. 3 : 115. 

 1832. Didymium michelii Lib., PI. Ard. fasc. II, 180. 



1842. Physarum michelii (Lib.) Corda, Icon. Fung. 5 : 57. 



1873. Chondrioderma michelii (Lib.) Rost., in Fuckel, Symb. Myc. Nachtr. 74. 



1894. Diderma michelii (Lib.) Morg. Jour. Cin. Soc. Nat. Hist. 16 : 153. 



1909. Chondrioderma hemisphcericum (Bull.) Torrend, Fl. Myx. 163. 



Sporangia gregarious, orbicular, discoid, depressed above and often 

 umbilicate below, stipitate or sometimes sessile, the outer peridium 



