212 A Monogrcrpfi of the Myxogastres. 



Closely allied to Chomlrioderma tcstaccum, if indeed it is more 

 than a geographical variety. Sporangia flattened, umbilicate 

 above, frequently dehiscing in a circumscissile manner, 



Chondrioderma mutabile, Schroeter. 



Sporangia sessile, deformed, hemis2')hcrico-dciirc&sed, or elongated 

 and curved, reniform, semicircular, &c., 1 — 3 /x long, 1 mm. 

 broad, hard, fragile, bright, greyish-hroivn ; columella tvcll de- 

 veloped, same shape as the sporangium, bright rufaiis-hroum ; 

 threads of capitulum thin, violet., here and there thickened in 

 a nodulose manner; spores globose, 11 — 14 \x diameter, blackish- 

 violet, mucronulate. 



Chondrioderma mutaUle, Schroeter, Kr. Fl., p. 123; Sacc, 

 Syll., 1273. 



On rotten wood. Silesia. 



Chondrioderma fallax, Rest. 



Sporangia spherical, sessile, yellowish-vMte, seated in numbers, 

 but not crowded, on a distinct common hyjriothallus ; columella 

 either minute and flcdtened,or of medium size and ovate; threads 

 fasciculate for some distance then branching copiously, obscure 

 violet; spores obscure violet : ivaoied, 12 — 14 /x diameter. 



Chondrioderma fallax, Rest., Mon., p. 171 ; Sacc, Syll., no. 

 1261. 



Salzburg, Tyrol. 



B. Columella ahsent. 

 Chondrioderma difForme, Rost. (figs. 35 — 38). 

 Sporangia sessile on a Iroad base, convex, circular or irregularly 

 elongated, outer wall snow-white, rather thick, breaking away 

 in patches, inner wall separated from the outer by a space 

 containing air, thin, without lime, brownish-ochre, sometimes 

 iridescent ; mass of spores blackish ; columella absent or repre- 

 sented by a small accumulation of lime at base of sporangium, 

 which is covered by the inner wall ; capillitium scanty, some- 

 times almost o\i?>o\Q,iQ,thrccuh springing from base of sporangium, 



