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Orange Powder on Tree Trunk

What I think is an alga, possibly Trentepohlia sp., on the trunk of a (living) silver birch tree.  Although orange in colour, this is classed as a green alga (Chlorophyta), the chlorophyll green being masked by yellow and red carotenoids.  

Photo taken in the Wilderness, Whiteknights Park, Reading University grounds, Reading, UK, on 2010-04-13.

Reader Comments (2)

Thanks for that. It caught my attention on that very tree! I've also seen it on ash trees in Sussex and the Chilterns.
2012-01-21 | Unregistered CommenterSue White
I think the same stuff causes a rather splendid effect at Snelsmore Common near Newbury. Thank you for the information, which I have duly credited to you in my own post.

2014-06-20 | Unregistered CommenterAmanda

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