JIYXOMYCETE6. o 



Didymimn melanopus /3 chivus, Fr. S. M., iii., 114 (1829) ; 

 B. & Br. Ann N. H., No. 110; Cooke Hbk., No. 1118,/3. 

 Dn/i/iniiun hemisphericiim, Wallr. Fl. Genii., 2192 (1833). 

 Didymium clavus, Rabh. Fl. Crypt., 2282 (184-1). 



39. Didymium farixiaceum. Sehrad. 



Sporangia hemispherical or a little flattened, decidedly umbilicate 

 at the base, greyish -white (in the form without lime, black and 

 shining), stipitate ; stem rigid, black, shining, or exceptionally 

 ferruginous-brown, usually equal in length to the sporangium, or 

 longer, or shorter and disappearing, being concealed in the umbili- 

 cus of the sporangium ; columella large, hemispherical, black, of 

 large cells proper to itself, the numerous folds of the membrane 

 imperfect y dividing the cells ; cells irregularly filled with small 

 granules of lime, collected in lumps ; capillitium of simple threads, 

 permanent, se i pen tine, bright-brown; spores dull-violet, very spi- 

 nulose, '01- 0125 mm. Lltfkl. Mon., 154. 



On dead leaves, twigs, &c. (Figs. 128, 171, 174.) 



a. genuinum. Stem black, shining, equal in length to the 



porangiuni, or half as much longer. 

 (2) rufipes. (Stem rust j -brown. 



(3. elongatum. Stem three times the length of the sporangium. 



y. subsessile. Stem short, disappearing, concealed in the umbi- 

 licus of the sporangium. 

 (2) confluens. Sporangia confluent in a series. 



S. nigxum. Form entirely without lime, hence with the surface 

 deformed, shining black, stem hidden in the umbilicus, 

 with the cells of the substratum also without lime. 



Spliocrocepl talus niycr, Hall, t. 1, f. 2 (1742). 

 Trichia, Hall, No. 2160, t. 4, f. 2 (1768). 

 Mucor sph&rocephalos, Batsch., p. 157 (1783). 

 Clatlirus sphcei ocephalos.) Rehl. (1786). 

 Tricllia globosa, Vill. Fl. Dauph., 1061 (1789). 

 Reticularia hemispherica, Bull. t. 446, f. 1 (1791). 

 Trichia compressa, Trent, p. 229 (1797). 

 Tricliia sphcerica, Trent, p. 230 (1797). 

 Tiichia depressa, Trent, p. 231 (1797). 

 Phyzarum melanospermum, Pers. Disp., p. 8 (1797). 

 Didymium J a tin act um^ ISclnad., t. 3, f. 6 (1797) ; Eng. Fl. v. 

 313; Cooke.Hdbk., No. 1123 ; Fungi Brit ii., 521. 

 Tricllia splice roccphala, Sow. t. 240 (1799). 

 Tiicftia Jaiinacea, Poir. 1 ncy. viii., 53. 

 Physarum farinaceum, Pers. Syn., 174 (1801). 

 Physarum cinerascens, Schuni. Saell., 1426 (1803). 



