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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
SpeciesdisporumFrom the Greek dis, “two or twice,” and spora, “seed,” referring to the two-seeded fruits

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 www2.palomar.edu

Rhizocarpon disporum on CalPhotos

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 12 Oct 2018.

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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 · Acadia National Park, Bar Harbor, ME