MYXOMYCETES. 13 



4. Physarum cinereum. (Batseh.) 



Sporangia irregularly globose, or hemispherical ; sometimes 

 completely flattened, sessile, gregarious, or crowded together; in- 

 variably "without stem or columella ; usually variable in size; 

 eapillitram strongly developed, containing numerous angular irre- 

 gular granules of lime, differing in size ; spores bright violet, with 

 a smooth membrane, or scarcely waited, variable in size, > 0075-'013 

 mm. cliam. Rtfki. Mon. 102. 



On bark, wood, leaves, &c. (figs. 85, 71, 72). 



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



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



Lycopt-rdon alni, Bjer. in Vet. Hand!., p. 39 (1789). 



Tricliia ccerulea, Trent, p. 229 (1797). 



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

 Letel'l. t. 710, f. 2. 



Phijxanun violaceum, Schuui. Saell., 1428 (1803). Fl. Dan., t. 

 1980, f. 2. 



Physarum corrugatujn, Link. Herb. 



Ph//saiiim ccelatiiin, Ehr. Herb. 



Physarum conglobatum, Fr. Gast., p. 21 (1818). Letell, t. 710, 

 f 3. 



Didi/minm cinereum, Fr. S. M. iii., 126 (1329). Eng. Fl. v., 

 314. Cooke Hclbk., No. 1133. 



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



Physarum Weinmanni, Fr. var. in Mtt. 



Didnmium melanopus, Wallr., No. 2,193 (1833). 



Physanim sinuosum, Wallr. 



Didymium scrobiculatum, Berk. Hook. Journ. (1845), p. 6G. 



Physarum album, Fckl. F. Rhen., 1469 (1865). 



5. Physarum virescens. (l)itin.) 



Sporangia sessile, scarcely one-third mm. broad, very much, 

 crowded, yellow or greenish, irregularly globose, without stem or 

 columella ; capillitium evanescent, containing very small granules 

 of lime in irregular angular masses ; spore* bright violet, with a 

 smooth membrane, -0075--009 mm. Etfki. Mon., 103. 



On leaves, &c. 



Pht/sarum rirescens, Ditm., t. 61 (1817). 

 Physarum thejoteum, Fr. Gast., p. 21 (1818). 

 Physarum anceps, Fckl. Sym. Myc., p. 343 (1869). 



6. Physarum contextuxn. (Pers.) 



Sporangia very much crowded, almost kidney-shaped, sessile, on 

 a broad base, or elongated and contorted, twisted together, and 



