DICTYDIUM. 211 



Genus II. PHYSARUM. 



Capillitium present, sporangia covered with a crust of lime, 

 rupturing irregularly Knots of capillitium filled with lime. 

 Columella none. 



P. alba. Fr. 



Sporangium, dalicate, depressed, white, fiocci few, spores 

 dark. 



In gardens on tan walks. 



Genus III. DIACH^A. Fr. 



Peridium of the sporangia very delicate, falling off in frag- 

 ments. Columella present. 



D. leucopoda. 



Sporangia, small, two lines high, one line thick. 



Found by C. G. Lloyd, when on a visit to Trexlertown, in the jungle 

 on an Asplenium felix foemina-pinnse. This is a beautiful myxo. 



Genus IV. FUI,IGO. Tanpit Slime. 



^thalia without columellse, not clustered, yellowish, then 

 brown. 



F. vaporarium. Fr. 



Yellow, effused over spent tan bark, in irregular patches ; 

 spores at length black. 



Common on old oak stumps, apple pomace, etc., all through the Valley. 



Genus V. DICTYDIUM. 



Sporangia simple, delicate, capillitium wanting, wall of the 

 sporangia with net-like thickening. 



