Evernia divaricata, a lichen

ralfwagner · Post by **ralfwagner** » Fri Nov 27, 2009 1:20 pm

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 µm. Spores single celled, ellipsoid, 8 per ascus, 8 x 5 µm. 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!

BJ · Post by BJ » Sat Nov 28, 2009 5:35 am

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 · Post by **Charles Krebs** » Sat Nov 28, 2009 9:28 am

Ralf,

Remarkable study and sequence of images.

ChrisR · Post by **ChrisR** » Sat Nov 28, 2009 10:34 am

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

ralfwagner · Post by **ralfwagner** » Mon Nov 30, 2009 12:47 pm

Hello @ all,

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