MILDEWS, RUSTS AND SMUTS 167 
Uredospores and teleutospores on living leaves of Triti- 
citm caninum. Switzerland. 
APPENDIX 
Form-genera ; forms which have not been respectively 
connected with any other form of reproduction. It is 
quite within the range of possibility that Aecidium, and 
Vredo conditions may exist, which, at the present day, are 
not connected with any other form of reproduction, in the 
same way that certain uredines at the present day have only 
a teleutospore stage. 
AECIDIUM 
Spores produced in chains, enclosed in a special receptacle 
or pseudoperidium. 
The contents of the spores are usually orange or yellow, 
the wall itself being colourless. 
Aecidium leucospermum, D.C. 
Pycnidia. Usually scattered over the entire surface of 
the leaves. 
Aecidia. Shortly cylindrical, white, edge torn ; spores 
angularly globose, smooth, colourless, 15—26 p diam. 
On Anemone nemorosa. 
As a rule all the leaves are attacked, and the habit and 
appearance of the plant is altered. Mycelium perennial. 
Aecidium poterii, Cooke. 
On the under surface of the leaves, in circular or elongated 
clusters, scattered or in concentric groups, also occurring 
on the leafstalks, immersed, edge torn into minute fugacious 
teeth ; spores yellowish, oval. 
On Poterium sanguisorba. A doubtful production. 
Aecidium phillyreae, D.C. 
Acridia numerous and densely crowded, edge torn or 
nearly entire, more or less incurved, whitish ; spores sub- 
globose or somewhat irregular in form from mutual pressure, 
wall colourless, minutely warted, contents deep orange- 
yellow, 25—^35 [X diam. 
On leaves and young shoots of Phillyrea latifolia, L., 
Pevensey Churchyard, Sussex, Aug., iqoy. 
Every shoot of the year, including the leaves, was at¬ 
tacked and contorted by the parasite, and during the month 
of August were rendered conspicuous by the copious 
development of orange spores ; hence the pardonable 
mistake on the part of a local scientist, in stating that this 
