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Thin-walled spores produced by the uredium
Urediniospores of 11
Milesina species. a
Milesina blechni on
Struthiopteris spicant b Milesina blechni on Struthiopteris spicant , cracked
spore with released plasma,
germ pores scattered c
Milesina carpatica on
Dryopteris filix-mas d
Milesina exigua on
Polystichum braunii , smooth surface e Milesina exigua on Polystichum braunii , smooth surface, plasma-free spore, germ pores bipolar f
Milesina feurichii on
Asplenium septentrionale with smooth areas on surface g Milesina feurichii on Asplenium septentrionale , cracked plasma-free spore, germ pores scattered h
Milesina kriegeriana on
Dryopteris carthusiana i
Milesina magnusiana on
Asplenium adiantum-nigrum with smooth areas on surface j Milesina magnusiana on Asplenium adiantum-nigrum , spore plasma-free, germ pores scattered k
Milesina murariae on
Asplenium ruta-muraria with smooth areas on surface l Milesina murariae on Asplenium ruta-muraria , cracked spore with released plasma, germ pores scattered m
Milesina polypodii on
Polypodium vulgare with smooth areas on surface n
Milesina scolopendrii on
Asplenium scolopendrium with smooth areas on surface o
Milesina vogesiaca on
Polystichum aculeatum , surface with very flat warts at the tip of the spore (arrow) p Milesina vogesiaca on Polystichum aculeatum , surface smooth (no warts visible at the tip), germ pores bipolar q
Milesina whitei on
Polystichum sp. r Milesina whitei on
Polystichum setiferum , cracked spore with released plasma, germ pores scattered.
Urediniospores (or uredospores ) are thin-walled
spores produced by the
uredium , a stage in the life-cycle of
rusts .
Development
Urediniospores develop in the
uredium , generally on a leaf's under surface.
Morphology
Urediniospores usually have two
dikaryote nuclei within one cell. In mass they are usually pale brown in contrast to
teliospores which are generally dark brown.
See also
References
C.J. Alexopolous, Charles W. Mims, M. Blackwell, Introductory Mycology, 4th ed. (John Wiley and Sons, Hoboken NJ, 2004)
ISBN
0-471-52229-5