DIAGRAM 
Showing life history of 59 best known genera of rusts. 
( Coleosporium 
y 
Melampsoropsis 
Pucciniastrum 
Melampsoridium : 
hetercecious 
‘ Melampsorella 
| +Calyptospora 
“4 
| } 
ecia cupulate—with catenulate spore Cronartium 
+Gymnosporangium 
repeating spores 
heteromorphic 
Nigredo 
Dicwoma heter. and aut. 
f Tranzschelia 
| Eriosporangium a 
Neoravenelia ! 
ecia ceomate—with catenulate spores Phragmopyxis Pautoecious 
Phragmidium 
eeiad Melampsora heter. and aut. 
[ Cystingophora 
| cia cupulate—with catenulate spores 4 eos : 
Uromycopsis 
Allodus 
t { Earlea 
repeating spores Gymnoconia 
| isomorphic with catenulate spores aenodekas | 
| *Pucciniostele i 
Ravenelia 
wecia ceomate Pileolaria bauteecious 
Uropyxis 
Prospodium | 
Triphragmium 
Pycniag with pedicellate spores Trachyspora 
r Spirechina 
Gallowaya | Kuehneola 
Necium Argotelium 
*Trichopsora Bullaria 
*Chrysomyxa Klebahnia J 
*Barclayella 
Chaconia 
Cionothrix 
Alveolaria 
Beodromus 
*Didymopsora 
| | Dietelia | 
[tein Bedopbylum Pautarcious 
Pucciniosira 
| Dendreecia | 
Discospora 
Macalpinia 
Polythelis 
Calliospora 
Nephlyctis 
Ameris 
Nyssopsora 
Polioma 
[ Telospora *Not represented in North America. 
Dasyspora J {Repeating spores unknown. 
