'rust' on fraxinus bark?

[sloth]

Anyone know what causes the orange rust like bark common on ash? Can't find it in any of my books I have on site with me or a search of the site, thanks in advance as I'm sure someone will help!

[Guest Infinitree]

What you speak of is probably an algae named Trentepohlia

[mrtree]

Trentepophlia is found as a free growing (green) algae and as a lichen photobiont.

 

Chlorophyta

Ulvophyceae

Trentepohlia

[sloth]

Thanks all, will check them out; is it the same as what is commonly on Apple trees in orchards by any chance?

[mrtree]

Get you hand lens out and start looking for clues. Also check under a microscope.

 

Identifying algae is not an easy thing but certain genera are common and yes you may be seeing the same thing on other tree species.

[sloth]

Get a hand lens would be a start! Would be useful I'm sure, what magnification would you recommend?

[mrtree]

eight or ten times is the most common. Check out NHBS to start.

 

Put a cord on it and never set it down or you will be buying another and another

[sloth]

Thank you very much, also, what's is NHBS?

[mrtree]

Natural History Book Service, a bibliophiles worst nightmare. Thousands of incredible books.

[sloth]

Excellent