DESCRIPTION OF PLATES. 



Plate I. 



Fig. I. — Mycelium of the aecidiospores of Puccinia porri on AUiiini 

 schanoprasitm near the spore-bed, showing the granular protoplasm and nuclei. 

 X 500. C. B. P. 



Fig. 2. — Mycelium of the aecidiospores of Puccinia iragopogouis. X 500. 

 C. B. P. 



Fig. 3. — Three spermogonia of ALcidiiim berheridis in different stages of 

 development, the two younger show the converging fibres which form their 

 necks. These subsequently separate and become paraphyses. X 200. 

 Modified from De Bary. 



Fig. 4. — Two spermogonia in a more advanced condition, seen in section. 

 X 200. De Bary. 



Fig. 5. — Spermatia being abstricted from their hyphse. X 200. De Eaiy. 



Fig. 6. — Three spermatia of /Ecidiuni befbcridis. X 475, and enlarged 

 to 1000. C. B. P. 



Fig. 7. — Five spermatia of ALcidiiim ranunculi repent is, April 29, 1883, 

 showing their different forms and somewhat irregular contour in the same 

 spermogonium. X 475, enlarged to looo. C. B. P. 



Fig. 8. — Three of the same spermatia after being twelve hours in sugar and 

 water; they are just beginning to bud. Enlarged to 1000. C. B. P. 



Fig. 9. — The same after forty-eight hours. Enlarged to 1 000. C. B. P. 



Fig. 10.— Spermatia of the aecidiospores of Puccinia adoxcc from Mr. A. 

 Lister's figure. X 710, enlarged to 1000. 



Fig. II. — Two spermatia of ALcidiuin punctaium in the act of budding, 

 j\Iay 7, 1883. Enlarged to 1000. C. B. P. 



Fig. 12. — Spermatia of ALcidium bcllidis, December, 1883. Enlarged to 

 1000. C. B. P. 



Figs. 13-15. — The same germinating in honey and water, after twelve 

 hours. Enlarged to looo. C. B. P. 



Fig. 16. — The same as they appeared on the sixth day. Enlarged to 1000. 

 C. B. P. 



Plate II, 



Fig. I. — The early stage oi Aicidium crassum, showing the basipetal spore 

 series enclosed by the pseudoperidial cells, and covered by the epidermis. 

 X 200. De Bary. 



