Ceinkowskia. 337 



Very closely allied to the genus Physarum, differing only in 

 having some free ends to the network of the capillitium. 

 Distrib. Europe ;. United States. Species 1. 



Ceinkowskia reticulata, Rost. (figs. 266, 267). 



Plasmodiocarp elongated, sinuous or irregularly anastomosing, 

 wall rough with lime, deep yelloio, sometimes with a tinge of 

 brown; capillitium rather scanty, threads yellow, about 3 /x 

 thick, forming an irregular net, with free, curved, pointed ends ; 

 here and there large, irregular, flattened nodes containing yellow 

 granules of lime are present; spores globose, dull violet, very 

 minutely verruculose, 8 10 /x diameter. 



Ceinkowskia reticulata, Rost., Mon., p. 91, fig. 107; Cooke, 

 Myx. Brit., fig. 107 ; Schroeter, p. 131 ; Sacc., Syll, n. 1440. 



On dead leaves and wood. Britain (Sibbertoft) ; Germany ; 

 Sweden ; United States. 



Usually forming an irregular network '5 2 cm. across, de- 

 hiscing irregularly. The number of flattened, lime-containing 

 nodes varies considerably in different individuals, being some- 

 times very numerous and originating mostly from the wall of 

 the sporangium. Closely resembling in habit and general 

 appearance Physarum gyrosum, Rost., a species not yet dis- 

 covered in Britain. 



(Rostafmski's Synonyms.) 



Physarum reticulatum, Alb. and Sz., I.e., 251, t. 7, f. 2 (1805). 

 Diderma reticulatum, Fr., l.c., iii., 112 (1829). 

 Didymium reticulatum, Bischoff. Kryptogamenkunde, f. 361 

 (1842). 



LEOCAKPUS, Rost. 



Wall of sporangium composed of two distinct layers, dehiscing 

 in an irregular manner ; capillitium attached at numerous points 

 to wall of sporangium, threads combined to form a dense, 

 irregular network with numerous nodes, many of which are 

 empty, the remainder large and filled with small granules of 



