Observation 114555: Lobaria pulmonaria (L.) Hoffm.
When: 2012-10-24
No herbarium specimen

Proposed Names

-27% (2)
Recognized by sight: An unusual lichen, even for this area. The fronds are foliose. The entire lichen is about 12 inches across. Individual lobes look surprisingly like pin oak leaves. I don’t believe I have seen this form before. It is the only specimen I found Wednesday. Surface has bright green toning to lime-green near the center, has strong veins visible through the surface. Surface also has small black pits, which may be spore-producing structures. Surface also mottled with irregular pits, edged with veins underneath. Underside of lichen has raised bumps and recessed veins; veins slightly rose-colored. Fingernail in last photo is 3/4 inch wide for scale. No visible rhizimes or root-like structures. Appears to be growing on top of either moss or another lichen.
15% (2)
Recognized by sight
61% (2)
Eye3 Eyes3
Recognized by sight
28% (1)
Recognized by sight
18% (2)
Eye3
Used references: Lichens of North America, by Brodo, Sharnoff and Sharnoff.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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I understand
By: Jason Hollinger (jason)
2012-10-27 02:12:04 BST (+0100)

regarding lack of options if it lacks soredia and isidia. I’d recommend taking a closer look next time you’re out there to be 100% sure it really is lacking these things. If it really is, then you’ve got no alternative to L. linita. I’ve typically seen L. linita on mossy rocks at low elevations, but this is not a strict rule.

Not L. linita
By: Daniel B. Wheeler (Tuberale)
2012-10-27 02:04:30 BST (+0100)

I did read the rest of Brodo, but it has no reference to this observation. This specimen was growing totally by itself, without stump or any nearby woody debris. The only trees present are quite young but rapidly growing. Most I would estimate 30-50 years of age. Trees in this area include Lodgepole pine, Douglas-fir, Red alder, and scattered, fairly rare and stunted Sitka spruce.

I agree this has green algae as the symbiont.

L. pseudopulmonaria was more in regard to the lack of soredia and isidia. In Brodo that seems to limit what it might be.

I don’t think so
By: Jason Hollinger (jason)
2012-10-27 01:36:50 BST (+0100)

Lobaria pseudopulmonaria has cyanobacteria instead of green algae, so it would never look this green even when wet. Good idea though, I’d totally forgotten about that species.

re: L. linita — you missed the rest of what Brodo says: “… or on trees, especially tree bases, on the coast”.

I think this looks perfectly normal for L. pulmonaria. That’s still my vote, even with the apparent lack of soredia. (They’re probably there, just hard to see.)

Checked in Brodo, Sharnoff and Sharnoff
By: Daniel B. Wheeler (Tuberale)
2012-10-27 01:15:16 BST (+0100)

Does not look like Lobaria linita, L. oregana, or L. pulmonaria.

RE: L. linita, Brodo states “on arctic or alpine sites”. Elevation at this site was 200-300 feet at most. Brodo says it can have abundant apothecia at low elevations. But I did not notice any.

RE L. oregana: cephalodia and apothecia conspicuous by their absence. Edges of thallus also lacking finely divided fringe.

RE L. pulmonaria: We have only had some minor rainfall in the last two weeks. Thallus is bright green, but was that color during the height of our “summer”, too, when we had 81 days of no rainfall. Soralia absent on ridges. Apothecia absent as far as I can tell. Only saw the one specimen, and didn’t really want to disturb it. Specimen was about 12 inches across, and looked quite healthy. Seemed kind of odd to not see other specimens nearby with the same features.

Brodo does mention a rare species: Lobaria pseudopulmonaria, which lacks soridia and isidia. Is this possible?

This was terrestrial on sand dune. The character of the thallus was strikingly similar to pin oak leaves (Quercus palustra) which I have been raking up for 3 weeks now, but lacking the sharp pin-like points at the edge.

It could be Lobaria linita
By: Jason Hollinger (jason)
2012-10-27 00:09:46 BST (+0100)

But more likely L. pulmonaria. Key feature is does it have soredia and/or isidia along any of the margins? I think this might, but I can’t zoom in enough to be sure. L. linita has no soredia or isidia. The other is L. oregana and it has tiny lobules along the margins, which this definitely does not have. All three should be present in wet old-growth forests along the OR coast.

Created: 2012-10-26 23:36:02 BST (+0100)
Last modified: 2012-10-27 01:52:46 BST (+0100)
Viewed: 48 times, last viewed: 2016-02-21 03:20:45 GMT (+0000)
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