Possibly Byssoloma marginatum?

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JennyS
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Possibly Byssoloma marginatum?

Post by JennyS » Sat Mar 21, 2020 12:11 pm

Dorset, on a fallen twig collected in a small dampish patch of mixed woodland - might this be Byssoloma marginatum or am I missing something obvious?
Two very small, brown apothecia with pale margins and a bluish colouration visible in section. Spores were mainly 3-septate (a few 1-septate), 12-15 x 4-5 µm.
z Q Byssoloma marginatum 200320 045.jpg
z Q Byssoloma marginatum 200320 052.jpg
z Q Byssoloma marginatum 200320 050.jpg
z Q Byssoloma marginatum 200320-1 12-15x4-5.jpg
z Q Byssoloma marginatum 200320-2 12-15x4-5.jpg
z Q Byssoloma marginatum 200320-4 12-15x4-5.jpg
z Q Byssoloma marginatum 200320-7-2 12-15x4-5.jpg
Jenny Seawright

Neil Sanderson
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Re: Possibly Byssoloma marginatum?

Post by Neil Sanderson » Sat Mar 21, 2020 12:29 pm

Jenny

If the green verrucose thallus is it’s thallus then unlikely, Byssoloma marginatum thallus is unusually very thin. The habitat is also wrong, Byssoloma marginatum is an oceanic woodland species mainly found on trunks. Have you checked for Fellhaneropsis myrtillicola? This would have a thallus like this, the habitat is OK and it has very similar apothecia internally.

Neil
Neil Sanderson

JennyS
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Re: Possibly Byssoloma marginatum?

Post by JennyS » Sat Mar 21, 2020 4:30 pm

Thanks for the reply Neil - and yes both thallus and habitat don't seem right.

I checked Fellhaneropsis myrtillicola but discounted it as the spores of mine were (1-)3 septate and 12-15 x 4-5 µm rather than 3(-5) septate 16-28(-34) x 3-4 µm (LGB&I).

I've a specimen I could post to you if you'd be willing to take a look at it?
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Neil Sanderson
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Re: Possibly Byssoloma marginatum?

Post by Neil Sanderson » Sat Mar 21, 2020 7:26 pm

Jenny

Happy to have a look. I have a picture of a cross section of Byssoloma marginatum from Frame Wood, New Forest:

2018-09-17-13.jpg
Byssoloma marginatum apothecia cross section in water

One distinctive thing are the projecting hyphae around the base of the apothecia in Byssoloma marginatum, not easy to see in the field but usually obvious in cross section. They are visible on bottom right of the picture above.

Your thallus looks very like the picture in Fungi and Lichens of Great Britain and Ireland http://fungi.myspecies.info/taxonomy/term/7335/media of Fellhaneropsis myrtillicola, so does look very like this to me, although the spores are smaller than given in the LGBI2.

Neil
Neil Sanderson

JennyS
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Re: Possibly Byssoloma marginatum?

Post by JennyS » Sun Mar 22, 2020 3:26 pm

Hi Neil - I've just thought of a very embarrassing possibility!
Might this just be Lecania naegelii as looking back at old micrographs the same bluish colouring is present in many of them?
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Neil Sanderson
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Re: Possibly Byssoloma marginatum?

Post by Neil Sanderson » Sun Mar 22, 2020 4:10 pm

Jenny

I was wondering about the blue-green epithecium, it did not really match either of the candidates. The LGBI for Lecania naegelii:
epithecium colourless or with granules which are pale grey-brown, to blue-green
I have not seen it with that dark a blue-green epithecium before but that would match the rather dark apothecia you have, so yes that could very well be it, never mind, never ventured never gained.
Neil - I've just thought of a very embarrassing possibility!
Not half as bad as my Calicium hyperelloides from Wales that turned out to be Calicium lenticulare!

Neil
Neil Sanderson

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