Adams: Darluca on Peridermium Peckii 315 



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Explanation of Plate 21 



Fig. 1. Photomicrograph of a cross section of the pycnidium of Darluca 

 filum on the aecium of Peridermium Peckii. Just below the pycnidium the 

 disorganized aecium is evident. The basal cells and sub-basal tissue is com- 

 pletely collapsed. Several aeciospores are evident below the pycnidium. 



Fig. 2. Photomicrograph of a cross section of the pycnidium of Darluca 

 filum on the primordium of the aecium of Peridermium Peckii. The pri- 

 mordium of the aecium is evident just below the pycnidium. The primordium 

 is not disorganized but the cells have degenerated and show little protoplasmic 

 contents. Early infection of a primordium prevents any further development. 



Fig. 3. Mycelium of Darluca filum ramifying and engulfing the aeciospores 

 in a mature aecium of Peridermium Peckii. Plasmolysis of the spores is 

 associated with the establishment of Darluca. 



Fig. 4. Various stages in spore development of Darluca filum. 



Fig. 5. Typical two celled spores of Darluca filum. 



