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Rhizocarpon disporum

Rhizocarpon disporum (Naeg. ex Hepp) Müll. Arg.

Rhizocarpon montagnei Körb.

Single-spored Map Lichen, Map Lichen

KingdomFungiMushrooms, lichens, gel fungi, yeasts, and molds; also called eukaryotes
DivisionAscomycotaSac fungi
SubdivisionPezizomycotinaSac fungi with filaments
ClassLecanoromycetes“Lichenized” fungi
OrderLecanoralesMostly lichen-forming fungi
SuborderLecanorineaeLichens
FamilyRhizocarpaceae
GenusRhizocarpon
Speciesdisporum

About plant names...

This is one of several ”map lichens,” so-called because at (very) close range, each tiny lichen is bordered by black spores that resemble borders on a map.

Identification: This is a crustose lichen, meaning that it forms a very thin layer, in this case over rock. It is pale gray or brownish gray, looking a bit like paint that dried too fast and cracked. If fruiting bodies (apothecia) are present (for example, in photo 6), they appear as small black dots less than a millimeter in diameter.

Online References:

Rhizocarpon disporum on Stephen Sharnoff Photography

Rhizocarpon disporum on Wayne's Word

Rhizocarpon disporum on the Global Biodiversity Information Facility

Rhizocarpon disporum on CalPhotos

Rhizocarpon disporum at the Consortium of North American Lichen Herbaria

References:

Walewski, Joe, Lichens of the North Woods, Kollath+Stensaas Publishing, 2007, p. 67

Rhizocarpon disporum (Single-spored Map Lichen, Map Lichen)

1 · 9/19/2009 · Acadia National Park, Bar Harbor, ME
≈ 5 × 3½" (13 × 9.2 cm) ID is uncertain

Rhizocarpon disporum (Single-spored Map Lichen, Map Lichen)

2 · 9/19/2009 · Acadia National Park, Bar Harbor, ME
≈ 17 × 12" (44 × 29 cm) ID is uncertain

Rhizocarpon disporum description by Thomas H. Kent, last updated 5 Oct 2016.

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Rhizocarpon disporum (Single-spored Map Lichen, Map Lichen)

3 · 9/19/2009 · Acadia National Park, Bar Harbor, ME
≈ 8 × 5" (19 × 13 cm) ID is uncertain

Rhizocarpon disporum (Single-spored Map Lichen, Map Lichen)

4 · 9/19/2009 · Acadia National Park, Bar Harbor, ME
≈ 8 × 5" (19 × 13 cm) ID is uncertain

Rhizocarpon disporum (Single-spored Map Lichen, Map Lichen)

5 · 9/19/2009 · Acadia National Park, Bar Harbor, ME
≈ 9 × 6" (23 × 15 cm) ID is uncertain

Rhizocarpon disporum (Single-spored Map Lichen, Map Lichen)

6 · 4/3/2010 · Mt. Battie, Camden, ME
≈ 5 × 3½" (13 × 9.2 cm)

Rhizocarpon disporum (Single-spored Map Lichen, Map Lichen)

7 · 9/15/2016 · Cadillac Mountain Summit, Acadia National Park, Bar Harbor, ME