Urediniospores are the thinner-walled spores of some fungi: (rusts and smuts), from which the basidium arises.
Urediniospores develop in the uredium at the bottom of a leaf's surface.
- Urediniospores are usually consist of two dikaryote nuclei within one constricted cell resembling the number 8 without a septation. As the spores germinate, the nuclei undergo karyogamy and thereafter meiosis, giving rise to four-celled basidia with haploid basidiospores.
- They don't have a thick-capped telia as compared to teliospores.
- Looks like a balloon pinched in the middle, (like an 8 without septation)
- C.J. Alexopolous, Charles W. Mims, M. Blackwell, Introductory Mycology, 4th ed. (John Wiley and Sons, Hoboken NJ, 2004) ISBN: 0-471-52229-5
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