38 MYXOMYCETES. 



(3. sessile. Sporangia discoid or lenticular, flattened, sessile with- 

 out stem ; colurnella usually convex, flesh-red, or flesh-brown. 

 Very readily confluent. 



Diderma contortion, Hoffm., t. 9, f. 2a (1795). 



Eeticularia contorta, Poir. Ency., vi., 182. 



Beticularia hemispherica, Sow., t. 12 (1797). 



Physarwn depression, Schum. Saell., No. 1439 (1803) , Fl. 

 Dan., t. 1972, f. 2. 



Diderma pliysarioi des, Scharn. Herb. 



Diderma depression, Fr. S. M., iii., 108 (1829). 



Diderma lenticulare, Wallr. Herb. 



Didymium Michelii, Lib. Exs., ii., 180 (1832). 



Didymium hemisphericum, Berk. Eng. FL, v., p. 312 (1836) ; 

 Cooke Hdbk., No. 1119. 



Physarwn Michelii, Corda. Ic., v., f. 33 (1842). 



Chondrioderma Michelii) Rostfki. in Fckl. Sym. Myc., Nach. 2, 

 p. 74. (1873). 



40. Chondxioderma spumaxioides. (//'.) 



Sporangia irregular in form, either snow-white on concolorous, or 

 greyish on flesh colour, always standing in clusters on a strongly 

 developed hypothallus ; columella either not recognisable or snow- 

 white, free in the centre, or multiform, flesh colour ; capillitiuin of 

 colourless threads or bright violet, combined into a net ; spores 

 violet, very spinulose, '0083--0137 diam. Rtfki. Mon., 174. 



On leaves, moss, &c. (Figs. 142, 145, 151.) 



a. caxcexina. Sporangia very small, \-\ mm. diam., snow-white, 

 the surface farinaceous, gregarious, narrowed, standing on a 

 whitish or rusty hypothallus, containing deposits of lime ; 

 columella either not evident, or central, vesicular, white. 

 Here belongs the form which contains a large quantity of 

 lime. Form of the sporangia globose, or mutually compressed, 

 and narrowed at the base, which is extended into a very short 

 stem. (Figs. 142-145.) 



/3. didexmoides. Sporangia irregularly angular, flattened, \-^ 

 mm. diam., grey, surface smooth, gregarious, standing on an 

 ochrey or flesh-red strongly developed hypothallus ; colum- 

 ella variously developed, always, however, flesh-red at the 

 base. (Fig. 151.) 



Spumaria physarioides, Pers. Syn., 163 (1801). 

 Physarwn didermoides, Fries Herb. 



Spumaria alba, Schum. Saell., No. 1414 (1803) ; Fl. Dan., t. 

 1798, f. 2. 



Didymium spumarioides, Fr. Gast. 20 (181S). 



