218 A Monoprffph of tJie Myxogastres. 



Chondrioderma calcareum, Rost. 



SporaDgia sessile and variahlc in form, ovate, elongated and 

 curved, &c., convexo-depressed, glaucous and hyaline when 

 moist, ajiaque and reddish or ^mZc v^hen dry, very fragile, at 

 length rupturing irregularly, leaving a brow^n impression of the 

 base after falling away; spores 9 — 11 ju, diameter, mixed with 

 a few black threads. 



Chondrioderma calcareum, Host., in Fckl. S. Myc, 2 Nch., 

 p. 74; Rost, Mon., p. 179; Sacc, SylL, 1280 ; Schroeter, p. 124. 



On dry stems. Germany. 



(Rostafinski's Synonyms.) 



Zcocarjms calcareus, Link, Diss. I., ]. c, p. 23 (1809). 

 Diderma liceoides, Fr., 1. c, iii., p. 107 (1829). 

 Diderma chalyheum, Wein., 1. c, p. 592 (1836). 

 Diderm.a deplanahtm, Fckl, S. M., p. 341 ; Non. Fr. (1869). 

 Chondrioderma calcareum, (Lk.) in Fckl., S. M., ii., Nch., p. 74 

 (1873). 



Chondrioderma Stahlii, Rost. 



Sporangia spherical, slightly flattened below, either dull 

 whitish-brown or shining and dingy brown; dehiscing by a 

 central pore, a long slit, or irregularly; stem hroivn, shining; 

 columella absent ; threads of capillitium either simple or more 

 or less repeatedly bifurcate above, net cmiihining to form a 

 network; spores pale violet, minutely verruculosc, 9 /^ diameter. 



Chondrioderma Stahlii, Rost., Mon., p. 185, f. 168; Cooke, 

 Brit. Myx., fig. 168; Sacc, Syll., 1287. 



Germany. 



DiDYMiUM, Schrad. (in part). 



Sporangia stipitate or sessile, wall single or double, surface 

 covered with lime, either in the form of a pulverulent stratum 

 of amorphous particles or crystals, or compacted into a granular 

 (but not porcelain-like) crust; columella present or absent; 



