34 MYXOMYCETES. 



bose snow-white columella ; Lower wall of sporangium and colu- 

 mella smooth, upper part when mature split into simple oval scales; 

 threads of capillitiuni thin- sided, without colour, spreading out 

 from the columella into numerous branches at a very sharp angle ; 

 spores bright violet, almost smooth, -0083-'01 mm. Rtfki. Mon., 

 159. 



On wood, dead leaves, &c. (Fig. 148.) 



var. a. genuinum. 



Sporangium reaching 1 mm. broad, hemispherical, flattened 

 at the base, and umbilicate, stem equal in length to the 

 sporangium, slightly longitudinally furrowed ; columella 

 distinct, globose, snow-white, upper membrane of sporan- 

 gium cracked when mature, with numerous oval scales, 

 threads of capillitiuni uncoloured. 



p leucopus. 



Sporangium -^ \ mm. broad, exactly globose, faintly um- 

 bilicate at the base, or not umbilicate; stem short, sturdy, 

 much furrowed longitudinally, membrane of sporangium 

 when mature not cracked, with simple scales; threads of 

 capillitiuni uncoloured. 



y costatum. 



Sporangium irregularly hemispherical or lenticularly flat- 

 tened, seemingly sessile, the short stem disappearing, very 

 much longitudinally plicate, wide at the base, grown to the 

 substratum ; membrane of the sporangium when mature 

 not cracked, with simple scales ; threads of capillitiuni 

 uncoloured. 



ti Plasmodiocarp flattened, veined, without columella, and with- 

 out stem. 



Reticularia hemispherica, Bull., p. 93 (1791). 



Diderma squamulosum, A. & S., t. 4, f. 5 (1805). 



Didymiwn globosum, v. stipitatum, Schwarz. Ac. Holm., p. 114 

 (1815). 



Licea stipitata, DC. Fl. Fr., No. 670 (1815). 



Tubulina pedicellata, Poir. Ency., v., p. 373. 



Cionium farinaceum, Nees., f. 106 b. (1816). 



Cionium squamulosum, Spr. Sys., iv., 028 (1827). 



Didyminm herbarum, Fr. S. M., iii,, 120 (1829). 



Didymium leucopus, Fr. S. M., iii., 121 (1829J ; Cooke Hdbk., 

 No. 1127. 



Didymium costatwn, Fr. S. M., iii., 118 (1829). 



Physarum liceoides, Duby. Bot. Gall., ii., 864 (1830). 



Didymium filamentosum, VVallr. Fl. Ger., No. 2!187 (1833). 



Didymiwn squamulosiun, Fr. S. M., iii., 118; Eng. FL, v. 312; 

 Cooke Hdbk., No. 1122. 



