308 A Monograph of the Myxogastres. 



* * Epispore reticulated. 



Physarum concimmm, Mass. (figs. 22 24).BoA\naV>i\i' 



Gregarious or crowded, sessile on a broad or narrowed base, 

 globose, outer wall white, thick, at first crust-like or continuous, 

 pulverulent, falling away in flakes and exposing the inner, thin, 

 iridescent wall; columella absent; capillitium dense, knots 

 large, irregularly stellate, white, connected by short, thin inter- 

 nodes ; spores globose, dingy purple, with slightly raised ridges 

 of various lengtlis anastomosing to form an irregular network, 

 11 13 n diameter. 



Diderma concinnum, B. and C., Grev., 1873, n. 343. 



Chondrioderma floriformc, Sacc., Syll., n. 1285 (in part.). 



On moss and wood. Britain (King's Cliffe) ; United States. 



Sporangia about '5 mm. diameter; the outer chalky layer 

 is at first compact and somewhat resembles that characteristic 

 of the genus Chondrioderma, but differs in being minutely 

 pulverulent and not porcelain-like. The British specimen 

 differs from the type in the Berkeley collection at Kew in 

 having the ridges on the epispore more decided, and forming 

 a more distinct reticulation. In the type the epispore is 

 furnished with a mixture of warts and bars, but the warts are 

 usually arranged in anastomosing lines. Saccardo's synonym 

 is clearly due, to some mixture of specimens, not, however, 

 present in the type specimen. 



* * * Epispore smooth. 

 Physarum Braunianum, De Bary. P.loteriYiV** 1 V\o<^ 



Sporangia irregularly globose, minute, sessile, scattered or 

 collected in little clusters, brown ; columella absent ; capillitium 

 well developed, knots of lime small, brown, angularly globose; 

 spores violet, smooth, 10 11 /* diameter. 



Physarum Braunianum, De Bary, MS.; Host, Mon., p. 105; 

 Sacc., Syll., vil, 1, 1182. 



Germany. 



About '5 mm. diameter. 



