Observation 52460: Usnea merrillii Mot.

When: 2010-05-26

Collection location: Seal Cove, 25 km southeast of Gaspé, Quebec, Canada [Click for map]

Who: Chris Parrish (kitparrish)

Specimen available


Growing on the bark of a conifer in a picturesque roadside park a few meters above a cobble beach, overlooking the Saint Lawrence and the Farillon peninsula.


Thallus pendant, pale yellowish straw, 8cm tall by 9.5cm wide. Base and a few patches on main branches near the base with small splotches of toasted brown to light creamy tan. Fibrils abundant, long, curled or crooked, intertwined. No isidia or soredia evident, but main branches with numerous minute low rounded tubercles. Thinner branches mostly smooth. Annular cracks frequent, exposing the white medulla. Core milky whitish (not reddish).


K+ deep yellow with scattered red spots in the medulla near the core, turning orange slowly; C-; KC+ red fading quickly to orange below the cortex or remaining red near the core; P+ yellow (immediately) changing slowly to orange in the medulla near the core

Herbarium specimen:
Canada, Quebec, 25km southeast of Gaspé, Seal Cove, 26 May 2010, Chris Parrish 0112

Common name: beaded beard lichen

Species Lists


branches, 10x
branches, 10x
branches, 10x
branches, 10x
brown patches, 10x
x-section, 100x

Proposed Names

29% (2)
Eye3 Eyes3
Used references: Hinds and Hinds, 2007, pp.487-511

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Check central cord
By: James M (macrolichens)
2010-09-13 14:45:46 PDT (-0700)

If you have a microscope: Fistulinae in the central cord of U. merrilli packed with crystals (in 50 specimens examined)

Only usnic acid or usnic acid & salazinic acid in each specimen tested w/ TLC

Also by “definition” the central cord of U. merillii is partially pigmented (reddish) since the type speciman has a partially pigmented central cord.
Pseudocyphallae should always be present if U. merrillii.

Created: 2010-09-09 19:39:33 PDT (-0700)
Last modified: 2010-09-13 14:19:13 PDT (-0700)
Viewed: 365 times, last viewed: 2018-12-05 17:08:04 PST (-0800)
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