320 Description of Plates. 
Fig. 12,—A thick-walled teleutospore of the same. X 200. C. B. P. 
Fig. 13.—Gymmnosporangium confusum thick-walled teleutospore germi- 
nating. xX 200. C, B. P. 
Fig. 14.—Thin-walled teleutospore of the same, germination rather further 
advanced. xX 200. C. B. P. 
Figs. 15-17.—Three teleutospores of Puccinia amorphe, showing the 
gelatinous investment. x 400. C. B. P. 
PLATE V. 
Fig. 1.—Mycelial hypha of Ust¢lago segetum from the base of the stem of 
Avena elatior. xX 500. C. B. P. 
Fig. 2.—Mycelial hypha from the rachis of the same plant. x 500. 
Cc. B. P. 
Fig. 3.—Mycelial hypha of U. Jongissima, the extremity of which has 
become gelatinized. x 500. C. B. P. 
Fig. 4.—Two gelatinized hyphze of the same, one of which (a) has become 
nodose, and in it spore-formation has begun (from Glyceria aquatica). X 500. 
Cc. B. P. 
Fig. 5.—Gelatinized hypha of U. segetwm from Avena elatior. xX 500. 
C. BP. 
Fig. 6.—Mycelial hypha of Sorosporium saponaria, which, after piercing a 
cell-wall, has become suddenly changed into a spore-forming hypha. x 600. 
Von Waldheim. : 
Fig. 7.—Gelatinized hypha of U. maydzs, showing the contents breaking up 
for spore-formation, x 900. Von Waldheim. 
Fig. 8.—A number of coalesced gelatinized hyphz of U. violacea in which 
spore-formation is taking place, and the contour of the spores is distinctly 
observable. x goo. Von Waldheim. 
. Fig. 9.—A gelatinized hypha of S. sapfonarie, which is coiled upon itself 
preparatory to the formation of a spore-ball. x 500, Von Waldheim. 
Fig. 10.—A young spore-ball of .S. saponaria, with the commencement of 
four spores seen in section, surrounded by the coalesced gelatinized hyphe. 
Treated with iodine. x 500. Von Waldheim. 
Fig. 11.—A larger spore-ball seen before the coalescence of the hyphe. 
x 300. Von Waldheim. 
Fig. 12, —Two spores from the interior of a spore-ball still attached to their « 
spore-forming hypha. ™ 800. Von Waldheim. 
Fig. 13.—The terminal branches of a spore-forming hypha of Uvocystis 
colchici becoming curved inwards.  X 1000? Winter. 
Fig. 14.—The same more advanced ; the external branches from which the 
pseudospores are developed are embracing the young spore-ball. x 1000? 
Winter. 
Fig. 15.—Another view of the same. x 1000? Winter. 
PLATE VI. 
Fig. 1.—Two mycelial hyphe of Zudercinia trientalis with botryform 
haustoria. X 520. Woronin. 
Fig. 2.—The = mary mycelium of Uvocystis occulta growing across the 
