336 A Monograph of the Mi/xogastres. 



On twigs, moss, &c. Brazil ; Argentine Republic ; Aiken, 

 S. Carolina. 



Gregarious, 1"5 — 2 mm. high, having the habit of rinjsarum 

 Schumacheri, but readily distinguished by the absence of a 

 columella and the very irregular sporangia which is not due 

 to the coalescence of several individuals, as proved by the thin, 

 simple stem. 



Tilmadoche reniformis, Mass. (n. sp.). 



Gregarious ; sporangia reniform, deeply umbilicate below, some- 

 times umbilicate above also, and then presenting a dumb-bell- 

 like form, coating of lime white, often becoming cracked, stem 

 elongated, slender, erect, straight, tapering upwards, pale brown, 

 wrinkled, filled with granules of lime ; capillitium rather scanty, 

 threads forming a very loose net, with scattered, fusiform swell- 

 ings, colourless or tinged yellow ; spores globose, dull purple, 

 coarsely spinulose, 16 — 17 /x diameter. 



Ceylon. 



(Type in Herb. Berk., Kew.) 



On bark. Gregarious, rarely scattered, 2 mm. high. The 

 sporangium is sausage-shaped and curved, the stem entering 

 the concave side or umbilicus. This peculiarity, and more 

 especially the large, coarsely spinulose spores, characterize the 

 species. 



Ceinkowskia, Rost. 



Wall of sporangium single, containing lime, dehiscing irregu- 

 larly; capillitium attached at many points to wall of spor- 

 angium, forming an irregular network having numerous free, 

 curved, pointed ends. 



CeinkowsJcia, Rost., Mon., p. 91; Cooke, Brit. Myx., p. 11 ; 

 Schroeter, p. 181 ; Sacc, Syll., vol. vii., pt. I., p. 329. 



Physarum, Alb. et Schwz., p. 90. 



Didcrma, Fr., S. M., iii., p. 112. 



Didymium, Bischoff. Kryptogamenkunde, f. 361. 



