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Lichen Placopsis gelida
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ralfwagner



Joined: 05 Aug 2006
Posts: 438
Location: Germany, Duesseldorf

PostPosted: Wed Sep 26, 2018 7:24 am    Post subject: Lichen Placopsis gelida Reply with quote

Hello,

this lichen was found by my wife during her Iceland holiday. Location was near Selfoss, substrate was lava.
Placopsis gelida is a crustose lichen, characterized by pale orange cephalodia in the center of the thallus. Cephalodia contain a second photobiont, in this case the cyanobacterium Stigonema. The other photobiont, situated in the lobes, is a coccoid green algae.

Closeup thallus:


Section cephalodium:


Section lobe, LCB stain:


Section cephalodium, darkfield:


Section cephalodium, polarized light:

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Last edited by ralfwagner on Wed Sep 26, 2018 10:46 am; edited 1 time in total
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Lou Jost



Joined: 04 Sep 2015
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Location: Ecuador

PostPosted: Wed Sep 26, 2018 7:27 am    Post subject: Reply with quote

Very nice. How do you get them off the substrate without breaking them?
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Jacek



Joined: 02 Oct 2011
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PostPosted: Wed Sep 26, 2018 10:28 am    Post subject: Reply with quote

Very nice
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vasselle



Joined: 05 Jan 2014
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Location: France

PostPosted: Wed Sep 26, 2018 11:18 am    Post subject: Reply with quote

Bonjour
Very nice
Cordialement seb
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ralfwagner



Joined: 05 Aug 2006
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Location: Germany, Duesseldorf

PostPosted: Thu Sep 27, 2018 10:30 am    Post subject: Reply with quote

Hello and thanks @all!

Lou, I was using a scalpell. It is popssible cut off small pieces that are suitable for a section, aprox. 2 or 3 mm in diameter.
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Ralf

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WalterD



Joined: 06 Jul 2015
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PostPosted: Sat Sep 29, 2018 1:28 pm    Post subject: Reply with quote

Beautiful! Both in- and outside.
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ralfwagner



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PostPosted: Sun Sep 30, 2018 10:16 am    Post subject: Reply with quote

Thank you, Walter.
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Ralf

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Smokedaddy



Joined: 07 Oct 2006
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PostPosted: Sun Sep 30, 2018 12:39 pm    Post subject: Reply with quote

Excellent
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ralfwagner



Joined: 05 Aug 2006
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PostPosted: Tue Oct 02, 2018 3:54 am    Post subject: Reply with quote

Thank you, smokedaddy.
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Ralf

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ChrisR
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PostPosted: Tue Oct 02, 2018 4:14 am    Post subject: Reply with quote

Beautifully done, as always Ralf.
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BJ



Joined: 29 Sep 2007
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Location: Portugal

PostPosted: Tue Oct 02, 2018 9:56 am    Post subject: Reply with quote

Ralf,

as usual great images. Your series of lichen photos are always superb.

Thank you for posting,

regards,

brianO
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ralfwagner



Joined: 05 Aug 2006
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PostPosted: Wed Oct 03, 2018 7:12 am    Post subject: Reply with quote

Thank you for your kind comments, Chris and Brian.
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Ralf

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RogelioMoreno



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PostPosted: Wed Oct 03, 2018 9:19 am    Post subject: Reply with quote

Nice!

Rogelio
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JH



Joined: 09 Mar 2013
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PostPosted: Wed Oct 03, 2018 9:41 am    Post subject: Reply with quote

Interesting photos and inspiring!
Best regards
Jörgen Hellberg
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ralfwagner



Joined: 05 Aug 2006
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PostPosted: Fri Oct 05, 2018 7:14 am    Post subject: Reply with quote

Thank you, Jörgen.
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Ralf

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