Observation 215587: Tuckermannopsis orbata (Nyl.) M.J. Lai

When: 2015-08-28

Collection location: Sea Ranch, California, USA [Click for map]

38.7285° -123.4731° 38m

Who: J-Dar

Specimen available

Collected along trail to the beach from Shell Beach parking lot off Highway 1. Common on Pine tree twigs.

Thallus upper surface yellow green, lower surface white throughout, no black. Rhizines absent on ascending lobes, few white rhizines at attachment points. Soredia absent. Apothecia common, marginal, stipitate, thin, with brown disk.

For Platismatia glauca, the underside should have black, and apothecia are generally rare. Neither of these features are accurate in this specimen so not too confident on this ID, or just highly variable.

EDIT: Thallus is yellowish green, same when wet just brighter green, and to get to Tuckermannopsis in the Brodo Lichens of NA key I have to choose 88. Thallus brown, brownish green, olive, or black when dry instead of Thallus pale grey to greenish grey when dry, and finally 99. Thallus brown to olive-brown… This gave me a little trouble at first, and the fact that the thallus color and form look a lot like P. glauca. But, with the negative results for all spot tests on thallus and medulla, lack of soredia, distinct black marginal pycnidia, and white rhizines and thallus underside, and lobules on lobes, point pretty clearly to Tuckermannopsis orbata.


Note lobules on lobe tips
Marginal pycnidia. Osteole visible at magnification.

Proposed Names

61% (2)
Eye3 Eyes3
Used references: Brodo Lichens of NA

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
New Photos & ID
By: J-Dar
2015-09-10 11:58:25 CDT (-0500)

Struggled with this one in the keys to genera, see notes above. Zaca, your Doubtful vote forced me to look harder, thanks!

Created: 2015-09-07 12:47:47 CDT (-0500)
Last modified: 2016-01-07 17:22:54 CST (-0600)
Viewed: 43 times, last viewed: 2017-06-20 19:33:01 CDT (-0500)
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