Flavoparmelia caperata (L.) Hale

Common greenshield, flavoparmelia lichen

About plant names...

Here in Massachusetts, I see more of these lichens than any others. I haven’t found a range map yet, but as nearly as I can tell, they occur worldwide.

Identification: This widespread lichen grows in circular patches on \[tree bark], and sometimes on rock. It is a pale yellow green color on top, and black below (pale brown on the edges). It is foliose (leaflike), with rounded, overlapping lobes. The apothecia (fruiting bodies) are goblet-shaped, and up to about ¼" (6.3 mm) in diameter, but they are not present very often.

Online References:

Flavoparmelia caperata on islandcreekes.fcps.edu

Flavoparmelia caperata on Discover Life

Flavoparmelia caperata on CalPhotos

Flavoparmelia caperata on the Stridvall Family Domain

Flavoparmelia caperata on Wikispecies

References:

Walewski, Joe, Lichens of the North Woods, Kollath+Stensaas Publishing, 2007, p. 107

9/5/2009 · Willard Brook State Park, Orange Trail, Townsend, Mass­a­chu­setts
≈ 9 × 7" (22 × 18 cm) ID is uncertain

Flavoparmelia caperata description by Thomas H. Kent, last updated 25 May 2020.

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4/1/2008 · Pepperell, Mass­a­chu­setts
≈ 2½ × 3" (7.3 × 7.8 cm)

5/7/2007 · Pepperell, Mass­a­chu­setts
≈ 15 × 10" (37 × 24 cm)

5/12/2007 · Pepperell, Mass­a­chu­setts