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Evernia divaricata, a lichen

 
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ralfwagner



Joined: 05 Aug 2006
Posts: 270
Location: Germany, Duesseldorf

PostPosted: Fri Nov 27, 2009 1:20 pm    Post subject: Evernia divaricata, a lichen Reply with quote

Hello,

this one is from the Tyrolian Lech valley, Austria.

- Habitusfoto



- Apothecium, up to 5 mm diameter, lecanorine, disc yellow-orange to brown.



- Cross section apothecium. Thalline exiple with symbiontic Trebouxia spec. .



- Cross section apothecium. Staining with Lactophenol-Methylblue-Acidfuchsin. Asci with spores.



- Ascus is of Lecanora type, 40 x 15 Ám. Spores single celled, ellipsoid, 8 per ascus, 8 x 5 Ám. Staining with Lugol.



- Chemistry: Evernia divarcata contains divaricatic acid and +/- usnic acid. After extraction with acetone in polarized light. Typical property of divaricatic acid is the rectangular ordering of the crystals



Have fun!
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Ralf

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BJ



Joined: 29 Sep 2007
Posts: 309
Location: Portugal

PostPosted: Sat Nov 28, 2009 5:35 am    Post subject: Reply with quote

Hi Ralf,

I have been waiting with anticipation for your next lichen post.

Worth waiting for !

Great crisp photos and a comprehensive collection. I personally like the ascus/spore photos and the 'unreal' crystal photo.

Thank you

Brian
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Charles Krebs



Joined: 01 Aug 2006
Posts: 4329
Location: Issaquah, WA USA

PostPosted: Sat Nov 28, 2009 9:28 am    Post subject: Reply with quote

Ralf,

Remarkable study and sequence of images.
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ChrisR
Site Admin


Joined: 14 Mar 2009
Posts: 3693
Location: Near London, UK

PostPosted: Sat Nov 28, 2009 10:34 am    Post subject: Reply with quote

Another splendid piece of work I'll be coming back to, several times.
Thanks! Very Happy
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ralfwagner



Joined: 05 Aug 2006
Posts: 270
Location: Germany, Duesseldorf

PostPosted: Mon Nov 30, 2009 12:47 pm    Post subject: Reply with quote

Hello @ all,

thank you for your compliments. The next lichen will follow....
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Ralf

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