Caloplaca flavovirescens (Sulphur firedot)

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Caloplaca flavovirescens (Wulfen) Dalla Torre & Sarnth.

Sulphur firedot

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

About plant names...

Sulphur firedot is common in much of North America.

Identification: This lichen prefers calcium-rich rocks, as well as unpainted concrete, which is rich in calcium. It is yellow or yellow-orange in color, and its apothecia (fruiting structures) are dark orange, with yellow borders.

Online References:

The Stridvall Family Domain

Stephen Sharnoff Photography

Discover Life

References:

Walewski, Joe, Lichens of the North Woods, Kollath+Stensaas Publishing, 2007, p. 58

Caloplaca erythrella (Ach.) Keiffer

Caloplaca flavovirescens description by Thomas H. Kent, last updated 25 May 2020.

Orange: Xanthoria elegans; yellow: Caloplaca flavovirescens. · 12/3/2005 · Maine ID is uncertain