Evernia divaricata, a lichen

Images made through a microscope. All subject types.

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ralfwagner
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Joined: Sat Aug 05, 2006 8:34 am
Location: Germany, Duesseldorf
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Evernia divaricata, a lichen

Post by ralfwagner »

Hello,

this one is from the Tyrolian Lech valley, Austria.

- Habitusfoto

Image

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

Image

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

Image

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

Image

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

Image

- 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

Image

Have fun!

BJ
Posts: 355
Joined: Sat Sep 29, 2007 10:53 am
Location: England

Post by BJ »

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

Charles Krebs
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Location: Issaquah, WA USA
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Post by Charles Krebs »

Ralf,

Remarkable study and sequence of images.

ChrisR
Site Admin
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Location: Near London, UK

Post by ChrisR »

Another splendid piece of work I'll be coming back to, several times.
Thanks! :D

ralfwagner
Posts: 441
Joined: Sat Aug 05, 2006 8:34 am
Location: Germany, Duesseldorf
Contact:

Post by ralfwagner »

Hello @ all,

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

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