If you would like to read my Dorset nature notes about any of these featured species or sites please click on the post title

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I have been interested in nature for most of my life but since I retired I spend as much time as I can exploring the nature reserves and wildlife hotspots of my adopted home, Dorset in southern England. Whilst out I record what I see and take snaps where I can (I am no photographer!) and that forms the basis of my Nature of Dorset website. When I find something new I like to research it and write about it in my nature notes, it is how I learn and hopefully you might find my notes helpful as well!

This website is for the people of Dorset interested in wildlife and for people from elsewhere interested in the wildlife of Dorset!

17 October, 2016

Downy Birch: the bronze medal



For years I roamed the Dorset heaths thinking that the trees with silvery bark were silver birch until, one day, a friend pointed out they were frequently downy birch (Betula pubescens); it came as quite a surprise! Obviously I wanted to know how to tell the difference.
There are small differences between them but they still remain a challenge to me. Firstly downy birch has a much smoother bark that silver birch. On silver birch the silvery bark tends to split as the tree ages and areas of dark under bark start to show. Not only is the bark smooth on a downy birch it also can be, especially when young, a bronze colour rather than silver. If you look at the outgrowing branches the downy birch has branches and twigs that tend to point upwards whereas on silver birch they tend to droop downwards. Twigs on a downy birch are hairy (hence the 'downy') and plain coloured whereas on silver birch they are smooth but with silver diamond shaped patches. There, you see it is quite easy! Even knowing this I still struggle. 
One thing with both species is that they attract various micro lichens that create patches on the bark, different species of lichen form different shaped patches. They are even harder to tell apart than the trees.
Downy Birch: the bronze medal