UREDINALES 
A group of Fungi which are obligate parasites on ferns 
and the higher plants. Mycelium filamentous, branched, septate, 
developed within the tissues of the host, producing teleuto- 
spores (resting spores, chlamydospores) which on germination 
give rise to a generally four-celled “basidium,” each cell of 
which may in turn produce, on a sterigma, a single basidio- 
spore (conidium). In addition, there are often produced 
spermatia (in spermogones), ecidiospores (in ecidia), and uredo- 
spores (in sori). 
PUCCINIACE 
Pucciyiz&. Teleutospores of one or two cells, 
Uromyces. 
scarcely gelatinous (except the pedicels in some 
= ( : Puccinia. 
foreign species). 
PHRAGMIDIES. Teleutospores of more than two 
‘cells, the walls of the pedicels subgelatinous. 
Triphragmium. 
Teleutospores more or less verrucose. Phragmidium 
; Kuehneola. 
Teleutospores nearly or quite smooth. Savona 
GYMNOSPORANGIES. Walls of pedicels of teleuto- ‘ 
spores becoming highly gelatinous. Gymmosporangium. 
UROMYCES Link. 
Autcecious or hetercecious. 
Spermogones deeply embedded in the tissues of the host, 
flask-shaped with conical mouth and ostiolar filaments. Aicidia 
with an evident, usually cup-shaped peridium; «cidiospores 
with indistinct germ-pores. Uredospores formed singly on 
their ‘pedicels, with several usually rather distinct germ-pores 
which are often surrounded by a- thickened border, rarely 
accompanied by paraphyses. Teleutospores one-celled, on dis- 
tinct pedicels, almost always with an apical germ-pore. Basi- 
diospores flattened on one side or kidney-shaped. 
