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Lasallia papulosa

Lasallia papulosa (Ach.) Llano

Lasallia pustulata (L.) Mérat ssp. papulosa (Ach.) W.A. Weber

Umbilicaria papulosa (Ach.) Nyl.

Umbilicaria pustulata (L.) Hoffm. var. papulosa (Ach.) Tuck.

Common Toadskin Lichen, Blistered Naval Lichen

KingdomFungiMushrooms, lichens, gel fungi, yeasts, and molds; also called eukaryotes
DivisionAscomycotaSac fungi
SubdivisionPezizomycotinaSac fungi with filaments
ClassLecanoromycetes“Lichenized” fungi
FamilyUmbilicariaceaeThe rock tripes, a family of Asco-lichenes in the order Lecanorales having a large, circular, umbilicate thallus
GenusLasallia
Speciespapulosa

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

Lasallia papulosa (Common Toadskin Lichen, Blistered Naval Lichen)

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

Lasallia papulosa (Common Toadskin Lichen, Blistered Naval Lichen)

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

Lasallia papulosa description by Thomas H. Kent, last updated 20 Jun 2017.

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Lasallia papulosa (Common Toadskin Lichen, Blistered Naval Lichen)

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

Lasallia papulosa (Common Toadskin Lichen, Blistered Naval Lichen)

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

Lasallia papulosa (Common Toadskin Lichen, Blistered Naval Lichen)

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

Lasallia papulosa (Common Toadskin Lichen, Blistered Naval Lichen)

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