48 Blackman and Fraser . — Further Studies on Uredineae. 
DESCRIPTION OF PLATES III AND IV. 
Illustrating the paper by Mr. Blackman and Miss Fraser on the Uredineae. 
Figs. i-io. Uromyces Poae. 
Fig. i. Early stage of development of aecidium beneath a stoma; a group of empty hyphae is 
seen above, and a mass of hyphae with uninucleate cells below, x 620. 
Fig. 2. Later stage of development in which a few of the uninucleate cells have become 
binucleate ; a nuclear migration is visible on the left, x 530. 
Figs. 3-6. Examples of nuclear migrations into fertile cells, x 1 350. 
Fig. 7. Aecidium just before it breaks through the epidermis; a few aecidiospores are already 
fully formed, the contents of which stain very deeply as if they had become disorganized. The 
yet unbroken pseudoperidium is very distinct, x 620. 
Fig. 8. Nucleus of aecidiospore-mother-cell, showing chromatin reticulum, x 1900. 
Figs. 9 a-d. Stages of conjugate division, x 1900. 
Fig. 10. Spermatia. x 1900. 
Figs. 11-16. Puccinia PoaruM. 
Fig. 11. View of the mass of hyphae forming young aecidium; only a small portion is drawn, 
starting from just below the epidermis (on the left) and reaching to the base of the mass (on the 
right). Cells with conjugate nuclei are visible at the base of the mass, x 1350. 
Fig. 12. Migration into fertile cell, x 1350. 
Fig. 13. Migration from vegetative cell into fertile cell above, x 1350. 
Fig. 14. Migration between two ordinary hyphae. x 1350. 
Fig. 15. Early stage of division of cell with three conjugate nuclei. The three chromatin 
masses on their simple spindles and the three nucleoli are clearly visible, x 1900. 
Fig. 16. Later stage of division of cell with four conjugate nuclei. x 1900. 
Figs. 17 and 18. Melampsora Rostrupi. 
Fig. 17. Two aecidiospore forming cells of young aecidium. The left-hand cell shows the 
remains of the partition wall indicating its origin by fusion ; above it is an aecidiospore-mother-cell 
in division. The right-hand cell has two sterile cells side by side above it, which also point to its 
origin by fusion, x 1350. 
Fig. 18. Another aecidiospore-forming cell showing its origin by fusion; two layers of dis- 
organizing cells are visible above the aecidiospore-mother-cell. x 1350. 
Figs. 19-23. Puccinia Malvacearum. 
Fig. 19. Uninucleate hyphae growing up beneath epidermis of host to form teleutospore mass, 
x 1350 - 
Fig. 20. Young teleutospore mass showing young undivided spores arising from a group of 
binucleate cells; a cell on the right is trinucleate. x 1350. 
Fig. 21. Cell with conjugate nuclei giving origin to two teleutospores ; the one on the right has 
already divided, that on the left is still unicellular, x 1350. 
Fig. 22. Young trinucleate teleutospore arising from trinucleate cell; the cell below also shows 
three nuclei, x 1350. 
Fig. 23. Young trinucleate teleutospore before division, x 1350. 
Figs. 24 and 25. Puccinia Adoxae. 
Fig. 24. View of young teleutospore mass showing the binucleate condition of both the teleuto- 
spores and the general mass of mycelium, x 430. 
Fig. 25. Two vegetative hyphae showing the binucleate condition, x 1900. 
Figs. 26 and 27. Uromyces Ficariae . 
Fig. 26. Young teleutospore sorus developing beneath the epidermis ; several of the teleuto- 
spores are trinucleate. x 430. 
Fig. 27. Cell of host showing binucleate haustorium close to nucleus, x 1900. 
