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Usnea lapponica Vain.

Powdered beard lichen, Lapland beard 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
FamilyParmeliaceaeIncludes many common lichens such as Xanthoparamelia, Usnea, Parmotrema, and Hypotrachyna
GenusUsneaFrom Arabic Ushnah, “lichen,” which was translated to Latin by Ebubekir Muhammed bin Zekeriya Razi
Specieslapponica

About plant names...

I don't have a range map for this lichen yet.

Identification: Beard lichens are difficult to identify without chemical tests, so the photos at right may not be correct IDs.

Online References:

Stephen Sharnoff Photography

Flickr

Wisconsin Mushrooms

References:

Walewski, Joe, Lichens of the North Woods, Kollath+Stensaas Publishing, 2007, p. 137

Usnea lapponica (powdered beard lichen, Lapland beard lichen)

11/28/2020 · Otter Brook, Harpswell Heritage Land Trust, Harpswell, Maine ID is uncertain

Usnea laracina Vain. ex Rasanen

Usnea sorediifera sensu Mot.

 

Usnea lapponica description by Thomas H. Kent, last updated 17 Aug 2021.

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Usnea lapponica (powdered beard lichen, Lapland beard lichen)

11/28/2020 · Otter Brook, Harpswell Heritage Land Trust, Harpswell, Maine ID is uncertain

Usnea lapponica (powdered beard lichen, Lapland beard lichen)

11/28/2020 · Otter Brook, Harpswell Heritage Land Trust, Harpswell, Maine ID is uncertain

Usnea lapponica (powdered beard lichen, Lapland beard lichen)

4/3/2010 · Birch Point Beach State Park, Owl’s Head, Maine ID is uncertain

Usnea lapponica (powdered beard lichen, Lapland beard lichen)

11/28/2020 · Otter Brook, Harpswell Heritage Land Trust, Harpswell, Maine ID is uncertain