Tuesday, January 02, 2018

Ash bark lichens, changing winds

The start of 2018 has been depressingly grey and wet so I was pleased to find something to attract my attention.  The smooth grey bark of the ash tree has quite a few scarcely visible, circular patches of lichen.  I think the species might be Opegrapha atra though this is very close to O. herbarum and some other species.  Getting an accurate determination will need microscope work I think.

On a rather larger level there have been further changes to the area surrounding M3 inasmuch a large whitebeam that has grown some 20 metres west of the project has blown down.  The reason is, I suspect, that many oaks were removed in the autumn from a garden to the north and this has allowed winds from the north to topple the whitebeam.  With the incense cedar to the south this will make a considerable change to the pattern of wind circulation in and around M3, though I doubt whether I shall be able to disentangle the effects of this from changes brought about by increased light levels and other factors.