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Close-up of Gymnosporangium clavariiforme telia emerging from Juniperus communis bark
Micrograph of two teliospores from telia of Gymnosporangium clavariiforme

Telium, plural telia, are structures produced by rust fungi as part of the reproductive cycle.[1] They are typically yellow or orange drying to brown or black and are exclusively a mechanism for the release of teliospores which are released by wind or water to infect the alternate host in the rust life-cycle.


  1. ^ Brand g, Brand R & Shattock R,.Sorting out Gymnosporangium species - the aecial stage, October 2006, Field Mycology Volume 7(4)