356 A. Barclay — List of the Uredinese occurring [No. 3, 



placed in water in a growing cell on the 20tli March, and they germi- 

 nated freely, although some spores preserved in botanical drying paper 

 since the previous autumn had lost vitality (Figs. 7 & 8, PI. XII.). The 

 promycelium from the upper cell emerges from the apex, whilst that 

 from the lower cell emerges from a point close to the septum. The 

 promycelium produces four sporidia from four cells into which the 

 end of the promycelium is divided, the most distant one being produced 

 upon a sterigma arising from the very apex of the germ-tube 

 (Figs. 7, 8, 9, PL XII.). The sporidia are oval, measuring from 6x4/* 

 to 7 X 5 /t (Fig. 10, PI. XII). 



Eemarks. — It is possible that this fungus is identical with, or, more 

 probably, a variety of, Puccinia Violce, Schum., although the measure- 

 ments of the latter given by Winter* do not agree with mine very 

 nearly. Winter's measurements are as follows : — ascidiospores 16 to 

 24 /x by 10 to 18 ft (average 20 x 14 fx) against my measurement of 

 21 X 18 ; uredospores 19 to 26 jx in diameter against my measurement 

 of 20 X 18 ft ; teleutospores 20 to 35 ft by 15 to 20 ft (average 27*5 x 

 17*5) against my measurements of 30 X 18 ft. The characters of the 

 teleutospores as given by Winter agree with those of mine. 



4. — Puccinia Pimpinell^, Strauss. 



Pimpinella diversifolia, D. C. 

 The- next secidium which attracts attention is not so common as 

 those above described, and occurs on Fimpinella diversifolia. This 

 parasite may be found in certain localities towards the end of April or 

 the beginning of May, and is very soon after that missed again. Indeed, 

 towards the end of May, it has already become very scarce. The fungus 

 usually attacks the first leaves that are unfolded of this plant, these 

 being simple leaves of the shape of the common violet leaf. The 

 compound leaves later unfolded were very rarely found attacked. The 

 invaded areas of leaves are discoloured, becoming pale yellowish green, 

 and the secidia are borne almost wholly on the under surface, though a 

 few occasionally break through the upper surface. . The secidial fruit 

 consists of tubular peridia measuring about 2 to 2*25 m.m. in length 

 which burst at their summits in a stellate manner. In addition to the 

 leaf blade, the petiole is not unfrequently attacked, and here the peri- 

 dial tubes are somewhat longer than they are on the leaf blade. 

 Several distinct patches of secidia sometimes occur on a single petiole, 

 but in such cases the blade is also largely affected. At these places 

 on the petiole the tissues are somewhat hypertrophied. The leaf blade 

 also where invaded is thickened, the depth of the laminal tissues at 



* Die Pilze Deutschlauds, &c. Von Dr. George Winter. 



