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.

comments (7)

Christine Young

Lion

Wow!! Posted 6 years ago

Ferdy Christant

Lion

Gary, double-checking: should we create Arthonia caesia or Chrysothrix caesia? Posted 6 years ago
1. Jivko Nakev
  
  Lion
  
  @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 6 years ago, modified 6 years ago
2. 1. Ferdy Christant
    
    Lion
    
    Yes sorry, I check photos in reverse chronological order so saw your comment later. Posted 6 years ago

Gary B

Lion

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 6 years ago, modified 6 years ago
1. Jivko Nakev
  
  Lion
  
  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 6 years ago
2. 1. Gary B
    
    Lion
    
    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 6 years ago