synan's picture

Thelotrema lepadinum

Observed: 8th September 2012 By: synansynan is knowledgeable about Fungi and Lichenssynan’s earned reputation in Fungi and Lichenssynan’s earned reputation in Fungi and Lichenssynan’s earned reputation in Fungi and Lichenssynan’s earned reputation in Fungi and Lichenssynan’s earned reputation in Fungi and Lichens
Thelotrema lepadinum
Thelotrema lepadinum (2)
Thelotrema lepadinum (3)
Description:

On semi-shaded tree root.

Identifications

Caution: Do NOT use iSpot to identify fungi to eat!

Some fungi are very poisonous so a mistaken ID could have serious consequences.

Species interactions

No interactions present.

Comments

jhn7's picture

Where's Alan or Jenny?

I'm sure you've looked but this does look correct
http://www.britishlichens.co.uk/species/Thelotrema%20lepadinum%202%20lar...

Janet
Certificate in Contemporary Science (Open)

synan's picture

Thanks

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).

Nigel

AlanS's picture

Before I saw this

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.

Alan

synan's picture

Many thanks

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.

Thanks again

Nigel

jhn7's picture

Yes please Alan.

I was surprised when it wasn't on your site!!

Janet
Certificate in Contemporary Science (Open)

gardener's picture

Still dithering

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).

http://www.irishlichens.ie/pages-lichen/l-40.html

More than happy (and very likely) to be proved wrong when you check the spores though!

synan's picture

Thanks

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.

Nigel

synan's picture

Revisited

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.

Nigel

AlanS's picture

Confirms Nigel was right

Yes, I agree, new photograph and spore details are conclusive.

Alan