Caloplaca flavovirescens (Wulfen) Dalla Torre & Sarnth.
Sulphur firedot, orange lichen
Sulphur firedot is common in much of North America.
Identification: This crustose lichen is yellow or yellow-orange in color, and its apothecia (fruiting structures) are dark orange, with yellow borders. It is crustose, that is, in a thin layer on its substrate..
Habitats: Calcium-rich rocks, as well as unpainted concrete, which is rich in calcium, and some coastal rocks.
Online References:
References:
Caloplaca erythrella (Ach.) Keiffer
Orange: Xanthoria elegans; yellow: Caloplaca flavovirescens. · 12/3/2005 · Maine 
ID is uncertain 
| Kingdom | Fungi | Mushrooms, lichens, gel fungi, yeasts, and molds; also called eukaryotes |
| Division | Ascomycota | Sac fungi |
| Subdivision | Pezizomycotina | Sac fungi with filaments |
| Class | Lecanoromycetes | “Lichenized” fungi |
| Order | Lecanorales | Mostly lichen-forming fungi |
| Suborder | Teloschistineae | Includes Caloplaca, Fulgensia, Teloschistes, Xanthoria, others |
| Family | Teloschistaceae | Includes Caloplaca, Teleschistes, Xanthoria |
| Genus | Caloplaca | Colorful rock-growing lichens |
| Species | flavovirescens |
Caloplaca flavovirescens description by Thomas H. Kent, not updated.
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