138 
BRITISH SPECIES OF UROMYCES, 
Uromyces excavatus. DC. 
I. Hymenium. JEcidium Euphorbia ?, Pers. Cke. “ Hdbk.,” 
No. 1610, in part. 
II. Stylospores subglobose, pale-brown, ‘018--02 mm. ; epispore 
granulated. 
III. Teleutospores oval, bright-brown, -028--03 x ‘018--02 ; 
epispore smooth or faintly striate, scarcely thickened above ; on 
short evanescent pedicels. Uromyces excavata , DC. Cke. “Micr. 
Fun.” (4th ed.), 213. 
On species of Euphorbia . 
There is usually some confusion and uncertainty amongst authors 
concerning these two species of Uromyces on Euphorbia. Having 
original specimens in our Herbarium from Persoon and DeCandolle, 
we are enabled to determine for certainty the species which each of 
these authors had in view. Persoon’s species (C/. scutellata), has 
pale teleutospores, which are very coarsely warted, whilst in 
DeCandolle’s species ( U . excavata ), the teleutospores are dark- 
coloured, with a smooth epispore, or with scarcely distinguishable 
striae. On the small Eupliobia exigua , if we mistake not, an 
Uromyces occurs which cannot be referred to either of these species, 
and which is perhaps the U. tuberculatus of Fuckel. 
Uromyces alliorum. DC. 
I. Hymenium uncertain. 
II. Stylospores subglobose, pale, -022 X *025 mm. ; epispore 
thin. Uredo alliorum , DC. Cke. “ Hdbk.,” No. 1579. 
III. Teleutospores elliptical, brown, -03- 035 x '015--018 mm. ; 
pedicels very evanescent. Uromyces alliorum , Cke. “ Hdbk.,” No. 
1542. 
On species of Allium. 
Uromyces ornithogali. Lev. 
I. Hymenium. sEcidium ornithogali , Kze. 
II. Stylospores, at present unknown. 
III. Teleutospores, ovate, fuliginous, brown, with a small hyaline 
apiculus, -03 X ‘02 ; on short hyaline pedicels. Uredo ornithogali , 
Kze. & Schm. 
On Gagea lutea. (Yorkshire). 
Uromyces concentricus. Lev. 
I. Hymenium. AEcidium scillce , Fckl. 
II. Stylospores globose, reddish-brown, mixed with the teleu- 
tospores. 
III. Teleutospores ovate, dull-brown, -02--025 X ‘02 mm. ; 
epispore smooth, thickened a little above ; pedicels longer than 
the spore, slender, hyaline. Uromyces concentricus , Lev. Cke. 
“ Hdbk.,” No. 1548. Fckl. “ Sym. Myc.,” p. 65. 
On wild hyacinth. 
Uromyces graminum. Cke. 
I. Hymenium unknown. 
II. Stylospores globose, pale, scarcely coloured, rough, •02--022 
mm. 
