461 
PUCGINIA ON GROUNDSEL, WITH TRIMORPHIC 
TELEUTOSPORES. 
By D. McAlpine. 
(Communicated by J. H. Maiden.) 
(Plates xxxiv. -xxxvi.) 
A specimen of Groundsel Rust was sent to me by Mr. Rod way, 
of Hobart, Tasmania, and found by him there on the 21st April 
of the present year. The aecidial-stage of the Groundsel Rust is 
common enough, at least with us at the Royal Horticultural 
Gardens, Burnley, but as he informs me this is the first and only 
instance in which he has found the black rust with teleutospores. 
At present, and indeed throughout the year, there is plenty of 
Groundsel with aecidia at the Royal Horticultural Gardens, but 
I have hitherto failed to find any teleutospores, and they are 
here recorded for the first time in Australia on Groundsel. But 
last year* I described a Puccinia on Erechiites, a genus closely 
allied to Senecio, received from Mr. Robinson, of Ardmona, and 
on comparing the two forms I find that the Groundsel Rust is 
very similar. 
Description. 
i. Aecidiospores. — -Aecidia forming blister-like swellings on stem 
and branches, on upper and undersurfaces of leaves, on flower- 
head stalks and involucre, causing discolouration and distortion 
and usually surrounded by paler green tissue; they are disposed 
in clusters without any definite order. 
Pseudoperidia round, sometimes oval, with white, scolloped 
everted edges; before opening tubercular. 
Aecidiospores spherical, oval or angular, orange-coloured, 
smooth, average 14-16 ^ in dia. or 14-17 x 12-16 ^. Very com- 
mon all the year round, except during middle of summer. 
* Proc. Roy. Soc. Vict. Vol. vii. N.S. pp. 214-221 (1894). 
