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Arthonia (Chrysothrix) caesia The yellowish crust with blue apothecia is Arthonia (Chrysothrix) caesia. Habitat is a very old jack pine (Pinus banksiana) cone that has probably been on this branch for about 20 years.<br />
<figure class="photo"><a href="https://www.jungledragon.com/image/74934/arthonia_caesia_old_name_chrysothrix_caesia.html" title="Arthonia caesia (old name Chrysothrix caesia)"><img src="https://s3.amazonaws.com/media.jungledragon.com/images/3383/74934_thumb.JPG?AWSAccessKeyId=05GMT0V3GWVNE7GGM1R2&Expires=1569456010&Signature=3ZquB%2FCvgnPOkxT2MmCps7seXAM%3D" width="118" height="152" alt="Arthonia caesia (old name Chrysothrix caesia) The yellowish crust with blue apothecia is Chrysothrix caesia. Habitat is a very old jack pine (Pinus banksiana) cone that has probably been on this branch for about 20 years. Arthonia caesia,Chrysothrix caesia,Geotagged,Minnesota,Spring,United States,frosted comma lichen" /></a></figure> Arthonia caesia,Chrysothrix caesia,Geotagged,Minnesota,Pinus banksiana,Spring,United States,frosted comma lichen,jack pine Click/tap to enlarge PromotedSpecies introCountry intro

Arthonia (Chrysothrix) caesia

The yellowish crust with blue apothecia is Arthonia (Chrysothrix) caesia. Habitat is a very old jack pine (Pinus banksiana) cone that has probably been on this branch for about 20 years.

Arthonia caesia (old name Chrysothrix caesia) The yellowish crust with blue apothecia is Chrysothrix caesia. Habitat is a very old jack pine (Pinus banksiana) cone that has probably been on this branch for about 20 years. Arthonia caesia,Chrysothrix caesia,Geotagged,Minnesota,Spring,United States,frosted comma lichen

    comments (7)

  1. Wow!! Posted 6 months ago
  2. Gary, double-checking: should we create Arthonia caesia or Chrysothrix caesia? Posted 6 months ago
    1. @Ferdy, to avoid confusion - Gary has uploaded two photos of the same species (i added it here) and we are discussing the same topic - which one is the accepted scientific name. Posted 5 months ago, modified 5 months ago
      1. Yes sorry, I check photos in reverse chronological order so saw your comment later. Posted 5 months ago
  3. Ferdy, as far as I have been able to find out Chrysothrix caesia is now the accepted name of this species.

    The Consortium of North American Lichen Herbaria uses it relegating all previous names as obsolete. http://lichenportal.org/portal/taxa/index.php?taxon=128284#

    iNaturalist and Mushroom Observer also use Chrysothrix caesia.

    A recent paper on the genus, The lichen genus Chrysothrix in the Ozark Ecoregion, including a preliminary treatment for eastern and central North America (Harriss and Ladd 2008), probably spells out the new changes and the reasons behind them but I cannot access it. It is at Research Gate (https://www.researchgate.net/publication/228754202_The_lichen_genus_Chrysothrix_in_the_Ozark_Ecoregion_including_a_preliminary_treatment_for_eastern_and_central_North_America).
    Posted 5 months ago, modified 5 months ago
    1. Gary, I created the record as Chrysothrix caesia, according to The Consortium of North American Lichen Herbaria classification. Allarthonia caesia Flot., Arthonia lecideella Nyl. ex Willey and Arthonia caesia (Flotow) Körber are shown as synonyms.
      The information is quite controversial and ambiguous, I think. If you get more up-to-date information, we will change the record accordingly.
      Posted 5 months ago
      1. Jivko, I'm going to request a copy of that paper by Harris and Ladd and hope they'll send me one. I've requested papers before from Research Gate but no response. And I'll keep searching for more info.
        Gary
        Posted 5 months ago

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Chrysothrix caesia is a lichenized species of fungi in the family Chrysothricaceae.

Similar species: Arthoniales
Species identified by Jivko Nakev
View Gary B's profile

By Gary B

All rights reserved
Uploaded Feb 25, 2019. Captured Apr 6, 2016 13:10 in 4408 Miller Rd, Barnum, MN 55707, USA.
  • Canon EOS DIGITAL REBEL
  • f/3.5
  • 1/640s
  • ISO400
  • 100mm