Field Key to Brilliant Yellow Foliose Lichens
1 Thallus some shade of yellow, K-; soredia at lobe tips …………………………………………………………. Candelaria concolor
![](https://ohiomosslichen.org/wp-content/uploads/2021/10/CANDCONC-PHYSMILL-PHYSHIRS-13Jul15-Canoe-BNH-Franklin-Cty-OH-1000x667.jpg)
Candelaria concolor
– Thallus with orange hues, K+ purple…………………………………………………………………… 2
2 Thallus with neither soredia nor isidia; apothecia conspicuous and abundant Rusavskia elegans, Xanthoria hasseana,and Xanthoria parietina
![](https://ohiomosslichen.org/wp-content/uploads/2021/10/RUSAELEG-Xanthoria-elegans-25Nov18nGeneva-Lke-Cty-OH-jetty-west_-1000x750.jpg)
Rusavskia elegans
– Thallus sorediate; apothecia uncommon……………………………………………………………… 3
3 Soredia produced within marginal “bird nests” bordered by upper and lower cortices Xanthomendoza fallax
![](https://ohiomosslichen.org/wp-content/uploads/2021/10/XANTFALL-14Oc21-Harding-Memorial-1000x739.jpg)
Xanthomendoza fallax
– Soredia produced at tips and lower margins of upturned lobes.. Xanthomendoza weberi
![](https://ohiomosslichen.org/wp-content/uploads/2021/10/XANTWEBE-26Sep19-Killdeer-Wyandfot-Cty-OH-on-post-1000x667.jpg)
Xanthomendoza weberi
![](https://ohiomosslichen.org/wp-content/uploads/2021/10/Xanthomendoza-14Oct21-Thew-1000x750.jpg)
Xanthomendoza weberi