MYXOMYCETES. 45 



Stemonilis leucopoda, DC. Fl. Fr., ii., 257 (1805). 



Diachcea i legans, Fr. Stirp. Fenisj., p. 84 (1825); Fr. S. M., 

 iii., 156; Berk. Ann. N.H., No. 112; Cooke Hdbk., No. 1154, 

 fig. 131. 



Diachcea leucopoda, Rtfki. Mon., p. 190 (1875). 



Genus 16. SPUMAR1A. Pers. 



^Ethalium complex, with numerous dendritic branches, each 

 sporangium being surrounded by an outer, common, meerschaum- 

 like cortex; sporangia tree-like, on the outside covered with 

 small crystals of lime, provided within with a central columella, ex- 

 tending also to the branches ; capillitium passing from the coln- 

 mella to the walls of the sporangium, forming a thick net; cortex 

 composed of empty cells (their walls enclosing small granules of 

 lime) touching each other, snow-white. Rtfki. Mon., 191. 



51. Spumaxia alba. (Bull.) 



Columella empty, cylindrical, branched, not reaching to the 

 apex of the sporangia ; threads of capillitium very thick, formed 

 into a thick network, very much thickened at tlie points of junc- 

 tion ; spores dull-violet, very spinulose. Rtfki. 3fon., 191. 



On grass, &c. (Figs. 158, 172, 175.) 



Mudlago 2, Mich., I 96, f. 2 (1729). 



Mucorii, Gled. Meth., p. 160 (1753). 



Mudlago Crustacea alba, Batt., t. 40, f. 9 H. I. (1755). 



Mudlago, Hall., No. 2129 (1768). 



Byssus bombydna, Retz. V. HandL, 251 (1769). 



Mudlago filamentosa, Bonamy., t. 3 (1772). 



Eeticulana alba, Bull. t. 326 (1791). 



Spwnaria mucilago, Pers. Disp., t. i., f . a b c (1797). 



Reticularia ovata, var. With. Arr., iv., 1978 (1803). 



Spwnaria cornuta, IS churn. Saell., 1415 (1803) ; Fl. Dan., t. 

 1978, f. 1. 



Spwnaria alba, DC. Fl. Fr., ii., 261 (1805) ; Fr. S. M., iii., 

 25 ; Eng. FL, v., 310 ; Cooke Hdbk., No. 1103. 



Spwnaria alba, a. laminosa, /3 cornuta, Fr. S. M., iii., 95 (1829). 



Didymium spumarioides, Fr. S. M., iii., 121 (1829). 



Diderma spumaria forme, Wallr. Fl. Germ., 2208 (1833). 



ORDER III. AMAUROCHJETE^. 



Single sporangium, or sethalium, without lime ; spores capilli- 

 tium, and columella almost always uniformly black, or brownish- 

 violet coloured. Rtfki. Mon., 193. 



Family 6. STEMONITACE.E. 



Walls of sporangia either not evident, or very evanescent; 

 elongated stem extending within the sporangia as a columella, 



