Observation 165835: Physconia Poelt

When: 2014-05-24

Collection location: River Park, Lebanon, Linn Co., Oregon, USA [Click for map]

Who: Daniel B. Wheeler (Tuberale)

No specimen available

An interesting lichen, with two distict growth patterns. In the center of the thallus, the lichen is dark forest-green to brown-green. The tips however are silvery white.

Lichen is tiny, rarely more than 1" in diameter. Bottom of forest-green thallus seems to be black, but silver-white under the silver-white areas.


Center thallus dark forest-green to brown-green; tips are silver-white.
Older aged are dark brown.
Near the center on the edges of the forest-green thallus are tiny protuberances. Isthidia?

Proposed Names

60% (2)
Recognized by sight

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= Observer’s choice
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Add Comment
Could be, zaca.
By: Daniel B. Wheeler (Tuberale)
2014-05-27 13:01:34 CDT (-0500)

I haven’t been observing lichens for long. I often err.

The difference between the first 3 phtos and the last 2 photos is the width of the lichen tips. Also, the last 2 photos show a more mature-looking specimen.

It seems to me that …
By: zaca
2014-05-27 12:45:53 CDT (-0500)

the last comment by Daniel is out of place. The photos in this observation are consistent and represent the same species of Physconia.

I’d opine not Physconia, too.
By: Daniel B. Wheeler (Tuberale)
2014-05-27 12:30:16 CDT (-0500)

But for different reasons. Has to do with the tiny white marginate things, plus the dual-toning. There may be two different species here: the latter 2 photos are from an initial separate obs.

Voting down P. distorta
By: Jason Hollinger (jason)
2014-05-27 11:43:58 CDT (-0500)

just because it’s not known from N. Amer. More likely candidate for this area is P. enteroxantha, but environmental variation is so great in these species that there’s no way to be confident of species without very careful microscopic examination, in my experience at least.

Created: 2014-05-24 22:20:21 CDT (-0500)
Last modified: 2014-05-27 11:42:28 CDT (-0500)
Viewed: 29 times, last viewed: 2019-07-13 10:53:38 CDT (-0500)
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