MYXOMYCETES. 37 



Sub-Genns 2. Pseudo-didenna. 



Wall of sporangium single, covered on the outside with masses 

 of grains of lime, often falling away in patches. 



37. Chondrioderma iiiveum. Ifffki. 



Sporangia exactly hemispherical, or by mutual pressure less 

 regular, from 2-3 mm. wide; sessile, snow-white, with very thick 

 walls ; colnmella large, regular, little flattened, rusty-brown ; 

 capillitium. strongly developed, of stout, stiff, simple threads, with 

 only a few expansions in the upper portion, dull violet ; spores dark 

 violet, warted, 'Ol-'OHG mm. diani. Rtfki. Mon., 170. 



Chondrioderma niveum, Rtfki. Mon., pp. 170 (1875) ; Berk. & 

 Br. Ann. N. Hist., No. 1594 ; Grevillea, v., p. 12. 



38. Chondrioderma physarioides. (DC.} 



Sporangia sessile, of irregular form, roundish, 1-3 mm. diam., 

 convex, or slightly flattened, with the sides mutually compressed, 

 chalky-white ; the wall crustaceous with deposits of lime ; colu- 

 mella not evident, or very insignificant, entirely flat, dull ochre ; 

 capillitium of very thin, delicate, uncoloured threads combined into a 

 flimsy net ; spores violet, scarcely warted, -0125 mm. diam. Rtfki. 

 Mon., 170. 



Spwnaria pliysariodes, DC. Fl. Fr., vi., p. 101, not Pers. 

 Diderma deplanatum, Fr. S. M., iii., p. 110; Eng. FL, v., 312; 

 Cooke Hdbk., No. 1116. 



Lcocarpus deplanatus, Fr. S. V. S., 450. 



39. Chondrioderma Michelii. (Lib.} 



Sporangia lenticular, snow-white, with a crust-like deposit of 

 lime, which falls away, either sessile or stipitate; stem ochrey- 

 white, with very plicate walls, the folds extending also to the 

 lower side wall of the sporangium, and there uniting in radiating, 

 net-like, convex thickenings ; colurnella in the sessile form lenti- 

 cular, convex, red -brown ; in the stipitate form more plane, 

 separated from the tubes of the stem by a proper wall ; threads of 

 the capillitium serpentine, colourless, very thin, rarely only 

 furcate, combined into a loose net ; spores bright violet, smooth, 

 0083 mm. In the sessile form readily blending two, or from three 

 to five together. 



On dead twigs, &c. (Figs. 131, 146, 149, 150.) 



a. stipitatum. Sporangia discoid, with the edge on the lower 

 side rounded ; stem rigid, puckered, the folds extending in the 

 form of reticulated convex veins along the under side ; 

 columella insignificant, almost plane, fleshy-red. 



