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
Canada, Quebec, 25km southeast of Gaspé, Seal Cove, 26 May 2010, Chris Parrish 0112
Common name: beaded beard lichen
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sum(score * weight) /
(total weight + 1)
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: 2010-09-10 04:39:33 CEST (+0200)
Last modified: 2010-09-13 23:19:13 CEST (+0200)
Viewed: 329 times, last viewed: 2016-06-21 19:15:40 CEST (+0200)