192 BOTANICAL GAZETTE [SEPTEMBER 
33. WITHERING, W. A., Botanical arrangement of British plants. Ed. 2. Vol. 
1.3787. 
34. ZUKAL, H., Untersuchungen iiber die Rostpilzkrankheiten des Getreides 
in Oesterreich-Ungarn 10:16. 1goo. 
EXPLANATION OF PLATE IV 
Phenomena appearing in the mycelium and Plein of Puccinia 
graminis in rusted grains of wheat during germination 
Fics. 1, 2.—Teleutospores, showing thin walls aa cells preparing for 
division; fig. 2 also shows an enlarged distorted stalk cell in which a cell wall 
has been formed. 
Fic. 3.—A teleutospore whose lower cell has divided. 
Figs. 4-6, 9, 10.—Early palmella-like stages, showing angular cells with 
thin walls. 
Fics. 7, 8, 11, 12.—Late palmella-like stages, in which the cells are more 
or less rounded, thicker walled, and less crowded. 
IG. 13.—A group of teleutospores lying in the edge of a pustule that was 
sectioned somewhat obliquely. 
Fics. 14, 15.—Radial sections through the base of pustules showing living 
cells of the sorus 
Fic. 16.—Mycelium lying in the pericarp; a few cells were alive and 
considerably enlarged, while the remainder of the filament was dead. 
IGS. 17, 19.—Dividing cells and living portions of mycelium lying in the 
pericarp remote from pustules; as in fig. 16, only a small portion of each 
filament was alive. : 
Frc. 18.—A group of cells found among the teleutospores of a pustule 
similar to that represented by fig. 13 (cf. 13a). ; 
Fics. 20, 22.—Fragments of mycelium found in the pericarp mixed with 
dead hyphae of the rust. 
Fic. 21.—A typical piece of mycelium found in the scutellum within 6 and 
7 cells of the radicle. 
