80 A. Barclay — A Descriptive List of the Uredinese [No. 2, 



cular patches on the leaves. On examining the yellow pustules they 

 were found to contain numerous uredospores, with some immature 

 looking yellow teleutospores, Avhile the black pustules contained mostly 

 dark brown teleutospores. These spores were put at once into water, 

 and while the uredospores germinated in the usual way no teleutospore 

 did so. 



The uredospores are angular orange red bodies, with an epispore be- 

 set with numerous warts (almost spines) and punctured by 7 to 9 germ 

 pores. They measure about 26 to 30/x in diameter. Only one germ 

 tube is emitted by each spore. 



The teleutospores are readily distinguished from those on Ruhus by 

 their pointed or mucronate ends. In yoang pustules some teleutospores 

 are orange yellow, though most are dark brown. They are also more 

 divided, each containing usually 7 or 8 cells, but sometimes even ten. 

 They measure about 100 X 33/x, (an unusually long spore with ten com- 

 partments measured 126 X 33/x). The spores are covered with coarse 

 warts. Another peculiarity consists in a very well marked bulging in 

 the stalks with a cavity containing yellowish granular matter (fig. 3, 

 PI. I). These spores germinate only after a period of winter rest. In 

 April I obtained sporidial formation in spores I had kept since the 

 preceding autumn. The sporidia are spherical, bright orange red, and 

 9"5 to 125//1 in diameter. 



The aecidial stage consists in the formation of very bright orange red 

 beds, sometimes of very extensive area. These beds are formed on the 

 leaves and on the smaller stems, and the mycelium bearing them always 

 gives rise to hypertrophy, sometimes very excessive, on the stems. In 

 the latter situation the hypertrophy is due to an excessive enlargement 

 of the parenchyma cells between the hypoderma and the central vascular 

 bundles. This stage is met with throughout the summer months. The 

 aecidiospores are given ofE in long chains, but there is no peridium of 

 any kind. The margin of beds is, however, fringed with club-shaped 

 paraphyses. In this stage spermogonia are numerous. They are super- 

 ficial, and frequently coalescing groups of them may be found on the 

 upper leaf surface opposite a bed of spores below. The aecidiospores 

 are pale orange red or yellow oval bodies, measuring on an average 

 20 X 17/w,. The epispore is thick and beset externally with tubercles. 



A bush in my garden is frequently attacked with this aecidium- 

 bearing fungus, but curiously enough it never bears teleuto- or uredo- 

 spores. 



Bemarks. — This is probably Fhragmidium suhcorticium, but the 

 hyaline point at the free end of the teleutospores is not nearly so long 

 as is given by Schroter and Plowright in their works. I would also 



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