New York Uncinulce. 217 



EXPLANATION OF THE PLATE. 



Uncinula adunca Lev. 

 Fig. 1. Part of the circumference of a conceptacle with one entire append- 

 age and the basal part of several others attached, x 240. 



2. A cluster of sporangia, x 240. 



3. A sporangium with its spores, x 400. 



Uncinula macrospora Pk. 



Fig. 4. Part of the circumference of a conceptacle with one entire appendage 

 and the basal part of several others attached, x 240. 



5. A cluster of sporangia, x 240. 



6. A sporangium with its spores, x 400. 



Uncintila circinata C.&P. 



Fig. 7. Part of the circumference of a conceptacle with two entire append- 

 ages and the basal part of several others attached, x 240. 



8. A cluster of sporangia, x 240. > 



9. A sporangium with its spores, x 400. 



Uncinula flexuosa Pk. 



Fig. 10. Part of the circumference of a conceptacle with one entire append- 

 age and the basal part of several others attached, x 240. 



11. A cluster of sporangia, x 240. 



12. A sporangium with its spores, x 400. 



Uncinula Clintonii Pk. 



Fig. 13. Part of the circumference of a conceptacle with one entire append- 

 age and the basal part of several others attached, x 240. 



14. A cluster of sporangia, part of them with spores, x 240. 



15. A sporangium with its spores, x 400. 



Uncinula Ampelopsidis Pk. 



Fig. 16. Part of the circumference of a conceptacle with one entire append- 

 age and the basal part of several others attached, x 240. 



17. A cluster of sporangia, part of them with spores, x 240. 



18. A sporangium with its spores, x 400. 

 Trans, vii.'] 28 



