306 A Monograjih of the Myxogastres. 



j?3;sicc.— Karst, Fung. Fenn., 698; Lib., Crypt. Ard., 376; 

 Fckl., F. Rhen., 1466; Cke., Brit. Fung., Ed. 11, 206; Ellis, 

 N. Amer. Fung., 1394; Klotzsch, Heib. Myc. (Rab.), 761; 

 Syd., Myc. March., 257; Rab., F. Eur., 798, 1913, 1070, 2139. 



On bark, wood, &c. Britain (Bristol, Hampstead, Castle 

 Howard, Yorks ; Carlisle, Linlithgow) ; France ; Germany ; 

 Finland ; Austria ; United States ; Cuba ; Ceylon. 



Readily distinguished by the very much laterally compressed 

 plasmodiocarp. The outer wall is sometimes almost as porce- 

 lain-like as in Chondriodcrma, but is usually rugulose. The 

 epispore varies, when seen under a power of 1200 diameters, 

 from almost smooth to being distinctly warted, anil in some 

 instances the warts become bar-like and more or less combined 

 to form a very delicate and broken network. 



(Rostafinski's Synonyms.) 



Reticular ia siyiuosa, Bull., t. 446, f. 3 (1791); Sow., t. 6. 

 Physarum bivalve, Pers., Obs., t, 1, f. 2 (1796). 

 Trichia sphaerica, ^. polymorplia, Trent., p. 230 (1797). 

 Angioridi%tin sinuosum, Grev., S. C. FL, t. 310 (1828); Eng. 



FL, v., 315; Cooke, Hdbk.', n. 1142, fig. 128. 

 Diderma valvatum, Fr., S. M., iii., 109 (1829). 

 Didymium sinuosum, DR. and M., Fl. Alg., p. 411 (1846). 

 Carcerina valvata, Fr., S. V. S., p. 451 (1849). 

 Lcocarpus melalcumis, Gay, in Mont. Syll., 1072 (1855). 

 Diderma contortum, Fckl., Sym. Mrc, 341 (1869). 

 Diderma pallidum, B. and C, in Grevillea, iii., 59 (1873). 



Physarum cerebrinum, Mass. (n. sp.) (fig. 275). 



Aethalium naked, broadly effused, or in small scattered 

 patches, consisting of very much contorted and anastomosing folds, 

 greyish-lilac, sprinkled with minute particles of lime ; capillitium 

 consisting of numerous, irregularly anastomosing threads about 

 3 \x thick, with here and there usually interstitial, large, elon- 

 gated swellings filled with large, amorpihous, yclloio granules of 



