Physarum. 275 



Didymium crythrinum, Cke., Grev., 1873. 



On bark, &c. Britain (Neatishead, Norths); Germany; 

 Sweden; France; Italy; Denmark. 



Distinguished amongst the red-stemmed species by the green 

 sporangium, and the capillitium consisting of thin, elongated 

 internodes, some of the nodes are flattened, with one or more 

 perforations and contain no lime, numerous others are filled 

 with lime which is usually tinged orange; from 2 2'5 mm. 

 high. 



Care must be taken not to confound the present species with 

 the green forms of Tilmadoche mutabilis. 



(Rostafinski's Synonym.) 

 Physarum psittacinum, Ditm., I.e., t. 62 (1817). 



Physarum Schumacher!, Host. (figs. 287, 288). 1 



Scattered or gregarious; sporangia globose, stipitate, warted 

 with granules of lime, yellowish-olive, often with a tinge of 

 green; stem erect, subequal, usually longer than the spor- 

 angium, filled with lime, longitudinally rugulose, expanding at 

 the base into a small hypothallus, pale yellow; columella 

 cylindrical, whitish; capillitium dense, forming an irregular net, 

 with numerous rather small knots containing yellowish granules 

 of lime ; spores globose, dull violet, minutely verruculose, 7 9 \j. 

 diameter. 



Physarum Schumacheri, Host, Mon., 99 ; Cke., Myx. Brit., 

 p. 11 ; Raunk., Myx. Dan., p. 74. 



Physarum citrinum, Sacc., Syll., n. 1176. 



Physarum chrysopeplum, B. and C., in Herb. 



Exsicc. Ellis, N. Amer. Fung., n. 1395. 



On bark, leaves, &c. Britain (Neatishead, Carlisle) ; Ger- 

 many ; Italy ; Finland ; Ceylon ; United States ; S. America. 



About 2 mm. high.' Capillitium dense, rather flaccid, inter- 

 nodes long, thin, many of the angles flattened and not contain- 

 ing lime, others irregularly branched and filled with yellow 

 granules ; columella prominent. The above description applies 



