Phaeographis smithii?

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Paul Cannon
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Posts: 19
Joined: Mon May 18, 2015 9:03 pm

Phaeographis smithii?

Post by Paul Cannon » Wed Jan 09, 2019 12:56 pm

Hello all
I picked this up from an oak twig near Guildford yesterday afternoon. I had assumed that it was a parasitic fungus (probably Colpoma) bursting through a young lichen thallus, but the fruit bodies do belong. It seems to be Phaeographis smithii which would be new to the VC (but then lots of species are), and the chemistry is more or less OK. It looks very similar externally to a collection that Mark Powell posted on FGBI (see http://fungi.myspecies.info/taxonomy/term/8228/media), on Corylus from Northants. However, P. smithii is essentially a western species, and material from there (see e.g. http://fungi.myspecies.info/taxonomy/term/8228/media) looks rather different. I wonder whether we have two species?

Best wishes
Paul
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Neil Sanderson
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Re: Phaeographis smithii?

Post by Neil Sanderson » Thu Jan 10, 2019 8:08 pm

Paul

I think your and Mark's, thalli are simply young thalli. The picture on fungi/myspecies from Melbury is an old, somewhat worn thallus (slug eaten a bit?), hence the different appearance (I note this actually my picture from British Lichens website!, that is fine). Phaeographis smithii appears to be a fairly mobile species which was lost from the south east to acidifying pollution; there are old records from Essex. It is now returning to former haunts with the decline in acidifying pollution and it will presumably be sometime before mature thalli exist.

Just to see if I can get attachments to work, I have (I hope) attached a photo of a Phaeographis smithii apothecia cross section from an Oak twig in the New Forest (from Jan Vondrak's Matley Wood plot). I have found with a sharp knife and wet apothecia one can separate Phaeographis smithii from Phaeographis dendritica in the field, if you cut the apothecia on a slant the closed or open exciple is reasonably easy to see. Impossible when dry though.
Attachments
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Apothecia section of Phaeographis smithii in water
Neil Sanderson

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