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Lichenicolous fungus on Protoparmeliopsis?

  • 05 Jul 2023 12:25 PM
    Message # 13223890

    I was intrigued by this net-like growth of brown fungus on the upper surface of a Protoparmeliopsis specimen I collected recently (kindly identified to genus by Jason Dart).  It consists of dematiaceous hyphae that are 2 microns in width and have numerous septae and side branches.  Since I didn't find any fruiting bodies, I assume it might be impossible to ID, but thought I would post it here to see if anyone had encountered this before?

    I've attached four photos of the fungus.  The host lichen is posted at iNat here:


    Ken Schneider

    San Francisco, CA  

    4 files
  • 06 Jul 2023 9:26 AM
    Reply # 13224341 on 13223890
    I've seen similar looking pigmented, branched strands on Usnea very frequently and wondered what they were! Unfortunately I can't be helpful with an id, but would also love to know.
    1 file
  • 06 Jul 2023 9:37 AM
    Reply # 13224348 on 13223890

    Lichenostigma? Various species prefer different lichen species as hosts.


    Last modified: 06 Jul 2023 9:50 AM | Richard Droker
  • 06 Jul 2023 7:04 PM
    Reply # 13224643 on 13223890

    Thanks Richard! Jason Dart also thinks this is genus Lichenostigma.   Kocourkova, Knudsen and Tucker list 10 spp. for California and I would guess there are others as well...

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