60 RePOKT Ob-' THE BOTANISX. 



EXPLANATION OF PLATES. 



Plate L — 1. Darluca infested carnation leaves. Natural sis!e. 

 2. The same leaves enlarged three times. Purple spot at left {two 

 leaves), dark spots in center and speck form at right. Photographed 

 with yellow color screen, by author. 



Plate H. — Tioo Darluca infested leaves, enlarged six times, show- 

 ing Darluca spots. The Darluca pycnidia are the Mack specks scat- 

 tered among the rust pustules, as at D and D.' From photograph 

 by the author. 



Plate III. — 1. Two pustules of rust (Uromyces caryophyllinus) 

 shoiving pycnidia of Darluca filum imbedded among the uredospores. 

 2. Isolated pycnidia of Darluca shoioing adherent filaments of 

 Uromyces; showing also relative size of spores of Darluca ancZ 

 Uromyces and the variation in shape of Darluca pycnidia. 3. 

 Gelatinous thread of Darluca spores. 4- Gross-section of a Darluca 

 infested Uromyces pustule. 5. Darluca spores from gelatinous 

 thread shown in Fig. 3. 6. Darluca spores get^minating. All 

 figures on this plate drawn with the aid of the camera ludda. 



