On semi-shaded tree root.
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Some fungi are very poisonous so a mistaken ID could have serious consequences.
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I'm sure you've looked but this does look correct
Certificate in Contemporary Science (Open)
I did see that. I was considering Pertusaria hymenea for this one until I noticed the barnacle-like exciple of the proper margin. Apparently "an indicator species of ancient woodland sites", which fits the location (Strid Wood).
I added my ID before I saw this. Yes, Pertusaria species can be treacherous, they have caught me out too.
At least Diploschistes scruposus doesn't grow on trees (or if it does, I call it Pertusaria hymenea too).
Making mental note to move Thelotrema up my priority list to add to my site.
At least that justifies my struggle with this one! I originally posted this as Pertusaria hymenea, then became doubtful, deleted the whole observation, and later reposted it as Thelotrema lepadinum. I hope some day soon I'll check the spores.
I was surprised when it wasn't on your site!!
I dithered for quite a while before adding my agreement to this one but came down in favour as it looked very similar to a slightly odd specimen of Thelotrema lepadinum I found in Killarney (link below, 3rd photo down).
More than happy (and very likely) to be proved wrong when you check the spores though!
Thanks for that comment. I remember looking at your photo, and it played a big part in my dithering too, as did the Pertusaria hymenea photo at http://goo.gl/srshF.
The account in Smith et al. (2009) of the variation in apothecia of T. lepadinum also played a role, because this was in a shaded, damp site near waterfalls, whereas my other observation was well away from the river.
Better photos may have helped, but it was in a bit of an awkward position - my standard excuse!
I know exactly where it lurks, so if/when I revisit and get it under a microscope, I'll update this.
Well, Jenny, you are spot on.
I made a detour to revisit this yesterday. The 3rd photo is new, though poor (gloomy conditions), but it should prove that I sampled the right specimen.
The spores are multiseptate (19-septate in one case) and 12.5-22.5µm wide.
Yes, I agree, new photograph and spore details are conclusive.
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