D1DYMIUM 85 



ii. Periclium small, globose. 



* Stipe dark brown or black : 



Columella dark, obsolete or none . 8. D. nigripes 

 ** Stipe generally paler, of various tints of brown, orange, 



etc. 



f Columella, yellow, discoid, rough . . 10. D. eximiitm 

 ff Columella pale or white, nearly smooth, 9. D. xanthopus 



I. DlDYMIUM COMPLANATUM (BdtScJl) Rost. 



PLATE XVI., Fig. 8. 



1786. Lycoperdon complanatum Batsch, Elench. Fung., I., p. 251. 



1829. Didymium serpula Fries, Syst. Myc., III., p. 126, Rost., App., p. 21. 



1875. Didymium complanatum (Batsch), Rost., Man., p. 151. 



Fructification plasmodiocarpous, creeping, flattened, vein-like, 

 annulate or reticulate, the dark-colored peridium covered with 

 gray, but not numerous crystals ; hypothallus none ; columella 

 none ; capillitium much branched, violaceous threads combined 

 to form a rather dense net which bears numerous, peculiar 

 rounded vesicles, yellowish in color, 3050 /u, in diameter ; 

 spores minutely warted, 7-9 /*, violaceous brown. 



The defining characteristics here are the curious supplement- 

 ary vesicles. Rostafinski, Man. tab., IX., Figs. 166 and 180, has 

 clearly shown the structure, although in the explanation of the 

 plate he has strangely mixed this species with D. crustaceum Fr. 

 Under D. serpula Fries may refer to the present species, 

 although there is nothing in his description to determine the 

 fact. The same thing may be said of the description and 

 figures of Batsch. Rostafinski, in the Monograph, seems to 

 have been satisfied as to the identity of Batsch's materials ; in 

 the Appendix, he writes D. serpula, but gives no reason. 



Rare. New York. Reported also by Massee and Lister. 







2. DIDYMIUM ANELLUS Morgan. 



PLATE XVI., Fig. 7. 

 1894. Didymium anellus Morgan, Jour. Cin. Soc., p. 64. 



Plasmodiocarp in small rings or links, then confluent and 

 elongated, irregularly connected together, bent and flexuous, 



