292 A Monograph of the Myxogastves. 



Fhysaruvi didcrmoides, Rost., Mon.,p. 97, ffgs. 74, 87; Cooke, 

 Brit. Myx., p. 11, figs. 74, 87; Sacc, Syll., n. 1171; Raunk., 

 Myx. Dan., p. 72. 



Didymiiim congcdum, B. and Br., Ann. Nat. Hist. (1850), 

 p. 865 ; Cooke, Hdbk., n. 1130. 



Spv.maria lichcniformis, Sz. (specimen from Schweinitz in 

 Herb. Berk.). 



Exsicc. — Sacc, Myc. Ven., 269 (as Didymium conycsium, 

 B. and Br.). 



On grass, twigs, bark, &c. Britain (King's Cliffe, Bulnier, 

 Yorks. ; Carlisle) ; France ; Germany ; Italy ; Russia ; Sweden ; 

 United States; Ceylon. 



Usually crowded or gregarious in considerable numbers, 

 springing from a tough, common hypothallus ; sporangia 1*5 — 2 

 mm. long, stem variable in length, usually shorter than spor- 

 angium, generally very weak, flattened or twisted. When 

 sessile the sporangia are sometimes shorter than usual. 



(Rostafinski's Synonyms.) 

 Sj)W)naria didermoides, Ach., in Pers., Syn., p. xxix (1801). 

 Diderma oUongum, Schum., Saell., n. 1423 (1803); Flor. 



Dan., t. 1973, f. 1 ; Fr., S. M., iii., 103. 

 Claustria didermoides, Fr., S. V. S., 451 (1849). 

 Didymium congestum, B. and Br,, Ann. Nat. Hist. (1850), 



p. 365 ; Cooke, Hdbk., n. 1130. 

 Didiimium farinaceum, Purt., M. F., p. 273. 



Physarum imitans, Racib. 



Sporangia hemispherical, umbilicate, greyish-white, dehiscing 

 irregularly, stipitate, erect or slightly nodding, stem subulate, 

 brownish-black, slightly longer than the sporangium, rigid; 

 columella absent, capillitium white, copious, forming an irregular 

 net, nodes irregular, sometimes filled with lime ; spores 9*5 — 10 

 mm. diam., violet, warted. 



Racib., Myx. Crac, p. 5, f, 8, a, h; Sacc, Syll, 1205. 



On branches. Poland, Sporangia (stem included) up to 

 1 nnn. hifrh. 



