BY D. McALPINE. 
463 
which, however, are accompanied by teleutospores. It is not to 
be inferred on that account that the production of teleutospores 
intermixed has any influence upon the size of the spores, for I 
find that the uredospores of Puccinia pruni, Pers., are just as 
large on a leaf producing them alone as when intermixed with 
teleutospores. 
The late Dr. Ralph in a paper "On the Aecidium affecting the 
Senecio vulgaris, L., or Groundsel,"* stated that he was able to 
trace by the use of strong carbolic acid the fine yellow sporular 
matter into the covering of the seed, the seed itself and the hairs 
of the pappus. It is interesting, as he points out, to find this in 
the fruit and its appendages, since the hairy pappus surmounting 
it would thus carry the fungus far and wide. I have found 
yellow colouring matter in the hairs of the plant, but have been 
unable to associate it with the fungus. 
The suggestion in the same paper that the source of rust in 
cereals may be found in the Groundsel, taking the place of the 
Barberry bush in other countries, is rendered highly improbable 
from the fact, apart from other considerations, that the teleuto- 
spores proper to itself have now been found on the Groundsel, 
along with the aecidiospores. 
in. It has been shown by Dr. P. Dietelf in the case of an 
allied fungus, Puccinia senecionis, Lib., that both kinds of spores 
— aecidiospores and teleutospores — are produced from one and 
the same mycelium, just as in Puccinia, graminis, Pers., the 
uredospores and teleutospores are similarly produced, so that 
probably here too aecidiospores and teleutospores have a common 
origin. 
Classification. 
This fungus belongs to the group Pucciniopsis, Schroet., having 
aecidiospores and teleutospores on the same host-plant, and the 
question naturally arises as to what species of Puccinia it belongs, 
seeing that the Compos itae have such a wide distribution, 
* Vict. Nat. viii. No. 2, 18 (1890). 
t Zeitsch. f. Pflalizk. Vol. hi. Pt. 5, 258 (!S9 5). 
