Isidia

Isidia

 

outgrowths on the surface of a lichen thallus formed by the hyphae of a fungus; algae live between the hyphae. When dried, isidia break off easily and germinate on a new thallus of the lichen.

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Thallus without isidia or soredia; medulla C- Punctelia bolliana 1.
The entirely laminal soredia, arising from the breakdown of the upper cortex or isidia, and the lack of colorless hairs and pruinosity generally separate it from the Rocky Mountain M.
The presence of unusual peltate or flattened isidia clearly distinguish this primarily northern species from P.
Isidia are present on the lobe tips, and the underside is pale throughout.