94 A Monograph of the Myxogastres. 



Lycogala argentea, Pers., Disp., 7 (1797). 

 Lycogala turbinatum, Pers., Syn., 157 (1801), 

 Strongylium fuliginoides, Ditm., t. 2, f. 1 (1809). 

 Fuligo lycopcrdon, Schum., Saell., 1409 (1803). 

 Reticularia argentea, Poir., Ency., vi., 20 (1806). 

 Reticularia, umbrina, Fr. S. M., iii., 87 (1829) ; Corda, Ic., vi., 

 f. 36 ; Eng. Fl., v, 308; Cooke, Hdbk., No. 1100. 



Sub-sect. II. LAMPRODERMAE. 



LAMPRODERMA, Rost. 



Sporangia globose or broadly obovate, usually stipitate, stem 

 continuous within the sporangium as a columella; threads of 

 the capillitium originating from the apex only of the columella, 

 primary branches either remaining simple for some distance 

 or branching irregularly from the base, the branches combining 

 to form an irregular network; wall of sporangium usually 

 iridescent, soon disappearing. 



Lamproderma, Rost., Mon., p. 202 ; Cke., Brit. Myx., p. 49 ; 

 Sacc., Syll., vii., 1, p. 390 ; Zopf, p. 1 56. 



Closely allied to Diachaea and Stcmonitis, but differing from 

 both in having the threads of the capiliitium originating from 

 the apex of the columella only. 



Distrib. Europe; United States; Ceylon; Australia; New 

 Zealand. Species 18. 



A. Spores smooth. 

 Lamproderma violacemn, Rost. (figs. 152 154). 



Gregarious on a strongly-developed hypothallus; sporangia 

 sub-globose, convex above, flattened or slightly umbilicate below ; 

 wall thin, blackish, with a dark violet lustre ; stem elongated, 

 black, thick at the base, attenuated upwards ; columella about 

 half the height of the sporangium, filled ivith large colourless 

 cells; branches of capillitium almost colourless, springing from the 

 ajjcx and sides of the columella, irregularly branched and com- 



