230 A Monograph of the Myxogastres. 



f. fasciculatum. Three to five sporangia confluent, supported 

 on a common stem. 



On wood, leaves, moss, &c. Cuba ; N. Zealand ; Ceylon. 



Remarkable for the circular, sharply limited hypothallus 

 with prominent, regularly radiating ribs, resembling the hy- 

 menium of a small agaric. Resembling superficially some forms 

 of Didymium squamulosum, var. costatum. 



Didymium clavus, Rost. (figs. 53, 54). 



Sporangia very much depressed, slightly convex above, plane 

 below, lime sprinkled in fine crystals on the surface of the dark 

 membrane ; stem short, blackish-brown, more or less longitudinally 

 rugulose ; columclla absent ; mass of spores blackish ; threads of 

 capillitium 3 4 /* thick at base, slightly tapering, sparingly 

 forked at acute angles, and sometimes laterally connected and 

 furnished with small ring-like dark-coloured thickenings, pale 

 brown to dirty violet ; spores globose, smooth, dingy lilac, 6 8 fx 

 diameter. 



Diftymium clavus, Rost., Hon., p. 153; Cpoke, Hdbk., p. 30; 

 Raunk., p. 87 ; Schroeter, p. 121 ; Sacc., Syll., 1299. 



On twigs, leaves, &c. Britain (Wey bridge, Kew, Orton Wood, 

 Leicester; Epping Forest, Forden, Linlithgow); France; Bel- 

 gium ; Germany ; United States ; Canada ; Egypt ; Ceylon. 



Sporangia scattered, 1 1*5 mm. across when circular, some- 

 times irregular and larger. Remarkable for the much flattened, 

 pileus-shaped sporangia. 



(Rostafinski's Synonyms.) 



Reticularia hcmispheriea, Bull., t. 446, f. 2 (1791). 

 Physarum davws, A. and S., t. 2, f. 2 (1805). 

 Didymium mclanopus, ft. clamis, Fr., S. M., iii., 114 (1829); 

 B. and Br., Ann. N. H, No. 110 ; Cooke, Hdbk., No. 1118, /3. 

 Didymium hemispJiericum, Wallr., Fl. Germ., 2192 (1833). 

 Didymium claims, Rabh., Fl. Crypt., 2282 (1844). 

 Didymium clavus, Berk., Eng. FL, v., p. 314. 



