telium

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A pustulelike sorus formed on the tissue of a plant infected by a rust fungus and producing teliospores.

Century Dictionary and Cyclopedia

1. n. The name given by Arthur to the teleutosorus of uredineal fungi.

Wiktionary

1. n. A sorus, in the form of pustule, in the tissue of plants infected with the fungus rust