358 A. Barclay — List of the Uredineae occurring [No. 3, 



are as follows : — whole length, of spore 30 /a ; length of lower cell 13 /w, 

 and of upper cell 1 7 /a ; breadth at septum 23 /^ ; extreme breadth of 

 upper cell 24 />t and of lower cell 22 /u. 



Remarks. — At first it seemed extremely probable that all the three 

 forms above described were phases of one fungus, and I attempted fre- 

 quently to establish a relationship between them by experiment, but 

 always without success. This alone, however, does not justify me in 

 definitely denying a relationship between them, since it is quite possi- 

 ble that some condition of my experiments militated against the mani- 

 festation of a relationship. However, the experiments were carefully 

 conducted and often repeated. I also attempted to reproduce the aecidium 

 by laying the teleutospores found on several grasses in the neighbour- 

 hood on the young leaves ; but in these attempts also I failed. 



This parasite is probably identical with Puccinia Pimpinellce, 

 Strauss, in which the secidiospores are said to measure 18 to 35 /x, long 

 and 16 to 21 /x broad (average 265 x 185 /x.), the uredospores, 23 — 32 /* 

 long and 19 to 24 fx broad (average 27*5 x 21-5), and the teleuto- 

 spores, 26 to 35 fji long and 17 to 26 fx broad (average, 30* 5 x 21-5). 

 The only feature in which this fungus differs from that which I have 

 described is in the characters and size of the uredospores. In Strauss's 

 plant the uredospores are said to be pale brown, while in mine they are 

 reddish yellow and smaller. 



5. — Puccinia coronata, Corda ? 



Ehammis dahnricus, Pall. 



The ^cidium which occurs on this plant is not very common, al- 

 though occasionally an attacked tree or bush is very extensively affect- 

 ed. The fully ripe secidium may be found as early as the latter part 

 of May, but it is more usually met with about the middle of July. The 

 fungus attacks leaves, young stem (Figs. 1, 2, 3, PI. XIII.), and drupes, 

 the last sometimes very extensively indeed. When the leaf is attacked, 

 the invaded areas are usually small, and generally only one patch occurs 

 on each leaf. These patches are dark reddish brown above, surrounded 

 by a halo of pale yellow (Fig. 2, PI. XIII.), and the orange-yellow aecidia 

 are borne on the lower or concave surface of the leaf, opposite the dark 

 central part seen above (Fig. 1, PI. XIII). The red colour of the 

 patch is due especially to discoloration in the palisade cells, and the 

 abnormal thickness to hypertrophy of the spongy tissue, the palisade 

 cells retaining their normal dimensions and characters. The tissues 

 in the areas invaded are very extensively permeated by hyphae, and 

 many cells are destroyed. While the thickness of the leaf blade 

 is normally 0126 m.m., it is about 0*440 m.m. in patches bearing ripe 



