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The telial host is the primary host in heteroecious rusts. The aecial host is the alternate host (look for pycnium and Aecium).
These terms apply when two hosts are required by a heteroecious rust fungus to complete its life cycle.
Teliospores are often dark-coloured and thick-walled, especially in species where they overwinter (acting as chlamydospores).
Two-celled teliospores formerly defined the genus Puccinia. Here the wall is particularly thick at the tip of the terminal cell which extends into a beak in some species.
Teliospores consist of Dikaryon cells. As the teliospore cells germinate, the cell nucleus undergo karyogamy and thereafter meiosis, giving rise to a four-celled basidium with haploid .
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