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What is this stuff growing under the wood?

GlenD

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26 Jun 2019
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168
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London
As title says.
 

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zozo

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Joined
16 Apr 2015
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7,849
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Netherlands
I've had something similar growing on wood in a garden tub.
https://www.ukaps.org/forum/threads/mission-bathtub-2018.52227/page-8#post-526932

I've asked several local and international forums with bryophyte and biology enthusiasts. Nobody was able to come up with a conclusive answer. Not even an idea where to start looking.

But looking closer with a microscope, i thought to see that it had a cellular structure build similar to algae.
And in my investigations, i came closest finding similarities to an (aquatic) Lichen.

https://www.nhm.ac.uk/our-science/our-work/biodiversity/freshwater-coastal-lichens.html

But in this field, ID'ing is even more problematic than with mosses. Especially when it comes to aquatic forms and or species very little is known about it.
 
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