ars Description of Plates. 
Fig. 2.—£cidium grossularie at maturity, after rupture of the epidermis 
and pseudoperidial cell-layer. X 150. De Bary. 
Fig. 3.—Four zxcidiospores of Puccinia poarum (Acidium tussilaginis), 
x 475. C. BLP. 
Fig. 4.—One of the same beginning to germinate and showing its germ- 
pores, five of which are visible, the sixth being on the opposite side of the 
spore. xX 475. C. B. P. 
Fig. 5 —Aicidiospore of Phragmidium -rubi in the same condition, and 
showing five germ-pores. X 475. C. B.P. : 
Fig. 6.—/Ecidiospore of Puccinia poarum twelve hours after germination, 
showing the circumnutation of the germ-tube, and the migration of the endo- 
chrome to its growing end. x 475. C. B. P. 
Fig. 7.—cidiospore of Gymnosporangium clavarieforme (Restelia lacerata), 
with six germ-pores, from one of which a comparatively short germ-tube has 
been protruded, which has become branched and full of endochrome from the 
spore, at its peripheral extremity. x 475. C. B. P. 
Fig. 8.—A basipetal series of zcidiospores of Chrysomyxa rhododendri 
showing the alternate abortive cells. 600. De Bary. 
Fig 9.—Ecidiospore-chain of Restelia cancellata, showing the undeveloped 
mother-cells between the spores.. X 300. De Bary. 
Fig. 10.—-Aecidiospores of Puccinia poarum (Aicidium tussilaginis) ger- 
minating upon the cuticle of Poa ¢tr7vialis, and entering the stomata. X 475. 
C. B. P. 
Fig. 11.—Part of a leaf of Vinca major, with the spermogonia and ecidia 
of Puccinia vince, X 2. C.B. P. 
Fig. 12.—Section of the same leaf, showing two of the pulvinate secidia. 
x 10, C.B. P. 
Fig. 13-—Section of a small eecidium. X 475. C.B. P. 
Fig. 14.—Two ecidiospores germinating. x 500, C, B. P. 
PLATE III. 
Fig. 1.—Sorus of the uredospores of Afelampsora farinosa, showing the 
paraphyses. x 200. De Bary. 
Figs. 2-4.—Uredospores of the same in different stages of development. 
* 300. De Bary. 
Fig. 5.—Uredospores and mycelium of Puccinia suaveolens treated with 
caustic potash, showing the development of the spores. x 300. De Bary. 
Figs. 6-8.—Development of the teleutospores of Uromiyces faba. X 300. 
De Bary. 
Fig. 9.—Uredospore of Puccinia graminis. Xx 475. C. B. P. 
Fig. 10.—Two uredospores of the same in the initial stage of germination, 
showing two germ-pores. x 475. C. B. P. 
Fig. 11.—Uredospore of the same after five hours and forty minutes’ 
immersion in water; it has emitted a germ-tube fromeach germ-pore. x 475. 
Cc. B. P. 
Fig, 12.—The same after twenty-three hours. One germ-tube has ceased 
to grow and is, like the spore, empty; the other, which is empty and septate 
