Urediniospores (or uredospores) are thin-walled
spore
In biology, a spore is a unit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores form part of the life cycles of many plants, algae, ...
s produced by the
uredium, a stage in the life-cycle of
rusts
Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture. Rust consists of hydrous iron(III) oxides (Fe2O3·nH2O) and iron(III) oxide-hydroxide (Fe ...
.
Development
''Urediniospores'' develop in the
uredium, generally on a leaf's under surface.
Morphology
*Urediniospores usually have two
dikaryote The dikaryon is a nuclear feature which is unique to certain fungi. (The green alga ''Derbesia'' had been long considered an exception, until the heterokaryotic hypothesis was challenged by later studies.) Compatible cell-types can fuse cytoplasms ( ...
nuclei within one cell. In mass they are usually pale brown in contrast to
teliospores which are generally dark brown.
See also
*
Chlamydospore
*
Urediniomycetes
*
Pycniospore
*
Aeciospore
*
Teliospore
*
Ustilaginomycetes
Ustilaginomycetes is the class of true smut fungi. They are plant parasites with about 1400 recognised species in 70 genera. They have a simple septum with a septal pore cap, this is different from Agaricomycotina which has a dolipore septum wi ...
*
Rust fungus: Spores
References
*C.J. Alexopolous, Charles W. Mims, M. Blackwell, ''Introductory Mycology, 4th ed.'' (John Wiley and Sons, Hoboken NJ, 2004)
Germ cells
Fungal morphology and anatomy
Mycology
{{Basidiomycota-stub