Lasallia papulosa (Ach.) Llano

Common toadskin lichen, blistered naval lichen

About plant names...

Toadskin lichen is aptly named. It is found on boulders and cliff faces: sandstones, granites, rhyolites, other acid rocks; and very dry surfaces. It is found throughout much of North America.

Identification: This is an umbilicate lichen, attached to a rock at a single point. Each lichen is up to 3½" (9 cm) in diameter, with pustules (bumps) that appear to radiate from the center. The upper surface is gray, flecked with black apothecia; or may be brown with rust-colored bumps. A technical description is available at the Consortium of North American Lichen Herbaria.

Online References:

Lasallia papulosa on Stephen Sharnoff Photography

Lasallia papulosa on lichenportal.org

Lasallia papulosa on Wikispecies

References:

Brodo, Irwin M.; Sharnoff, Sylvia Duran; Sharnoff, Stephen, Lichens of North America, Yale University Press, 2001

9/17/2016 · Mount Desert Island, Bar Harbor, Maine

9/20/2013 · Mt. Watatic, Ashby, Mass­a­chu­setts
≈ 5 × 4½" (13 × 11 cm)

Lasallia papulosa description by Thomas H. Kent, last updated 25 May 2020.

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11/8/2009 · Yellow Trail from Pearl Hill State Park to Willard Brook State Park, Ashby, Mass­a­chu­setts
≈ 9 × 7" (22 × 18 cm) ID is uncertain

4/21/2013 · Crow Hill Trail, Leominster State Forest, Leominster, Mass­a­chu­setts
≈ 5 × 3½" (13 × 9.2 cm)

7/3/2012 · Yellow Trail from Pearl Hill State Park to Willard Brook State Park, Ashby, Mass­a­chu­setts
≈ 6 × 4" (15 × 10 cm)

9/20/2013 · Mt. Watatic, Ashby, Mass­a­chu­setts
≈ 6 × 6" (15 × 14 cm)

9/19/2009 · Acadia National Park, Bar Harbor, Maine
≈ 11 × 7" (27 × 18 cm) ID is uncertain