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Unkown Driftwood Lichen and Notes on Identifying on iNat

  • 10 Mar 2026 6:07 PM
    Message # 13608197
    Hi all,
    To skip my rambling about iNaturalist, go to >>>> for the Lichen question

    Over the last few months I have been identifying on lichens stuck at a taxon level higher than family in the PNW and giving refining id's so that others can find them and identify to species. Turns out I have now left an ID on ~10,000 lichen observations.
    In doing so I have realized that there are some distinct species that I can sight ID confidently, which had very few observations a few months ago and were not yet in the CV(computer vision, iNats proprietary AI image recognition)

    These include:
    Pertusaria subambigens
    Pertusaria glaucomela(lookalike P. suboculata differentiated on habitat?)

    Coccotrema maritima

    Porpidia carlottiana

    Multiple Fuscopannarias
    Nephroma tropicum

    Pannaria oregonensis

    Cyclohymenia epilithica

    Japewia tornoensis

    Protoparmelia ochrocca

    and more not coming to mind at this time
    (Some of these fall into the category I describe further on, of finding multiple images that look the same and not having a name attached, identifying one then filling the rest in)

    The next CV update will probably add a few of the afforementioned sp (threshold of 60 images to be trained) due to my efforts.
    As much as I like to complain about the CVs inaccuracies and peoples over reliance on it, it is simply a tool. When trained incorrectly or when lacking alternatives, it will not work as intended. So one must put in the work to sort through laymen lookalikes and out of range things, and to add id's to species not yet in the system, and only then will the system improve.

    >>>>>
    In viewing over 100k pictures of Lichens I have a few "species" that I feel are consistent in morphology and habitat that I feel someone should be able to sight ID.
    This being one example:

    Consistently on foreshore driftwood


    Photo Credit: Randal Sourced from:https://www.inaturalist.org/observations/40246264

    Some more examples:

    https://www.inaturalist.org/observations/183266377
    https://www.inaturalist.org/observations/71851127

    https://www.inaturalist.org/observations/183878762

    There are probably more of this thing lying at Lecanoromycetes waiting to be found and identified
    Any clue what this is, or what genera it might be and where to start from if I personally collect this?
    >>>>>>

    In case there are people curious about my identifying url, I am searching for pezizomycotina to include all asco lichens then excluding orders/classes that are non lichenized then only showing those above family (Guide to iNat url modifiers)
    Explore Page & Identify Page sorted by longest since updated or randomly


    Additional side tangent, since calicioid lichens are not a monophyletic group, I've made a project to collect those that I come across, to easily find and review in the future or to help others

    Maybe I am a bit of a weird nerd, (who here isn't) but I've found it satisfying to clear a page or two of these observations in the evening while watching something in the background.



    Last modified: 10 Mar 2026 10:06 PM | Anonymous member
  • 11 Mar 2026 8:09 AM
    Reply # 13608366 on 13608197
    Anonymous member (Administrator)

    That's a nice list of crusts that can be easily field ID'd with a hand lens. Very few people have gotten into crusts in North America, so having good examples on iNat will definitely help people along that path.

    About your shoreline sterile crusts -- those are are pretty challenging to field ID or ID just from iNat photos. For most of them I would need spot test info. For the first photo, there are several species that can get those bluish mounded soralia. 

    The second one might be the same, but the soralia have an elongate look and appear in chains so is probably a Xylographa. The third one has a yellowish tint, so might have usnic acid, or it could just be the lighting, but if it has usnic it's not a Xylographa. The 4th one looks like another sorediate Xylographa to me. There are a couple of common sorediate Xylographa spp on the coast. They differ somewhat in appearance but I don't find that very consistent, but you can use spot tests to separate them.

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