Physarum. , 299 



France ; Switzerland ; Algiers ; S. Africa ; United States ; 

 Ceylon ; Australia ; India. 



Varying from *5 2-3 mm. when elongated ; some forms of 

 the present species resemble externally Didymium serpula, Fr., 

 but are readily distinguished under the microscope. 



Var. ovoideum, Sacc. Sporangia vertically ovoid, densely 

 gregarious. 



Physarum cinereum, var. ovoideum, Sacc., Mich., ii., p. 334. 



Britain (Lynd hurst, New Forest) ; France. 



(Rostafinski's Synonyms.) 



Mucilago Crustacea, Mich., Gen., t. 96, f. 9 (1729). 



Lycoperdon cinereum, Batsch, fig. 169 (1783). 



Lycoperdon alni, Bjer., in Vet. Handl., p. 39 (1789). 



Trichia caerulea, Trent., p. 229 (1797). 



Physarum cinereum, Pers., Syn., p. 170 (1801); Nees, f. 107; 



Letell., t. 710, f. 2. 

 Physarum violaceum, Schum., Saell., 1428 (1803) ; Fl. Dan., 



t. 1980, f. 2. 



Physarum corrugatum, Link, Herb. 

 Physarum coelatum, Ehr., Herb. 

 Physarum conglolatum, Fr. Gast., p. 21 (1818); Letell., 



t. 710, f. 3. 

 Didymium cinereum, Fr., S. M., iii., 126 (1829); Eng. FL, 



v., p. 314; Cke, Hdbk., 1133. 

 Physarum plumbcum, Fr., S. M., iii., 142 (1829). 

 Physarum Weinmanni, Fr., var. in litt. 

 Didymium melanopus, Wallr., n. 2193 (1833). 

 Physarum sinuosum, Wallr. 



Didymium scrobiculatum, Berk., Hook. Journ. (1845), p. 66. 

 Physarum album, Fuckel, F. Rhe'n., 1469 (1865). 



Var. flexuosum. sessile on a broad base, depressed, spherical 

 in outline, or elongated and variously curved, wall at first white, 

 becoming grey when the outer chalky layer has broken away 

 in flakes; columella absent; capillitium dense, threads thin, 

 2 fj. diameter, colourless, Jtexuous or spirally coiled, furnished 



