One of three - two Locations
https://www.inaturalist.org/observations/36022955
https://www.inaturalist.org/observations/35927209
My third Observation
It is widespread at this new location.

I do not find micrography easy but in this case the most obvious features appear in all Online Publications.
Typically here https://www.researchgate.net/figure/Zygogonium-ericetorum-Habitat-a-macroscopic-appearance-b-and-d-and-photomicrographs_fig1_257994888
and
https://www.semanticscholar.org/paper/The-green-alga-Zygogonium-ericetorum-Charophyta)-Herburger-Remias/5287c242f2989a0f5d25afa61aebb34a4fe64c96/figure/3

Filament type B1 in pictures 7 & 8 is quite different to the main ones and yet seems to be present in all samples - it is VERY distinctive
My cell-phone app is used for under-lighting (light table App)
I used this key successfully
https://www.algalweb.net/search4.htm
I am very grateful to @roman_romanov for the original ID.

My second Zygogonium ericetorum in as many days.
These pictures are taken 14 days later than for the previous record and I expected a much greener result - it was colder and wetter. But the samples still show the ferrous tone that is indicative of species-form.
It is widespread on the headland.
I do not find micrography easy but in this case the most obvious features appear in all Online Publications.
I am mystified by the filament in picture 14
My cell-phone app is used for under-lighting - Picture 13
I am very grateful to @roman_romanov for the initial ID.

Some online links
https://d3i71xaburhd42.cloudfront.net/5287c242f2989a0f5d25afa61aebb34a4fe64c96/6-Figure2-1.png From -https://pdfs.semanticscholar.org/5287/c242f2989a0f5d25afa61aebb34a4fe64c96.pdf?_ga=2.20015160.1429334316.1574614158-141978553.1574287727
and
https://www.researchgate.net/figure/Zygogonium-ericetorum-Habitat-a-macroscopic-appearance-b-and-d-and-photomicrographs_fig1_257994888

The UK's most northerly Walnut tree is in my garden. It is only 9 feet high and bears no fruit. It was grown from seed collected from Oxfordshire in 2001. The leaves a distinguishable as are the scars on its spindly stem.
There are only a few (maybe 8) of these north of this in the whole World. The most northerly is here https://www.gbif.org/occurrence/2408954874

I have visited 10 distilleries where this fungus is rampant. Usually expresses as sooty staining on external walls, nearby trees, signposts and street furniture. It forms on structures up to 600 metres (downwind?) away from Distilleries and Bond Warehouses. It is known to cause unsightly staining on nearby modern dwellings.
It is granular and can be scraped from the surface and cultivated. Here we see examples on structures at the Blair Athol Distillery, as well as one or two from other locations..
3 Pictures showing the distinctive spore chains
https://en.wikipedia.org/wiki/Baudoinia_compniacensis

This is not always deep red. It matures and propagates in January and is quite red from October..
During the summers, it loses pigment and growth but the fine, binding, filaments still hold the sand together.
It is not so easily seen and what 'turf' shows, is the same colour as the sand. One needs to collect a small portion (not easy) and examine through a x10 glass to see the compacted sand grains holding the filaments tightly.
Quite widespread.

A third, perhaps final, Observation of Sea Felt from me. This from a new location and giving the opportunity to again suggest that good pictures showing the overall morphology, of a light brown 'cloud' matted on the shore and probably attached to fucus species, is almost as good as detailed micro-pictures. I believe this can be identified in the field if one is careful to avoid any fine seaweed that has visually discernible filaments. The filaments of Sea Felt cannot easily be seen by naked eye.
Picture 4 shows a typical form of Sea Felt, there seems to be a central stem but this a feature of the fine threads coalescing into a bulky cord. Slip a hand under it and the threads themselves will not be discernible.
Pictures 5 and 6 contain no Sea Felt.
With a good x10 glass one can resolve the filament cords, where twining has occurred - picture 8. Picture 9 shows how fine the filaments are.
See also https://www.inaturalist.org/observations/26565760
and
https://www.inaturalist.org/observations/26669986

Sea Felt may best be identified from its overall morphology. It appears most often as a brown cloud attached to Fucus but can occur washed in unattached.
It is incredibly fine close-to and cannot be identified with just close up photos. It is JUST possible to see, via a x10 glass, the woven filaments which appear to make very fine 'ropes' - if you can see those, then you're on a good bet - Picture 11. Beyond that you will have to spend quite a time at the microscope to get photos of the minute features that ID it positively - the general cell structure and the specific presence of intercalary sporangia, mid-length of those microscopic filaments will thus conform the ID - Picture 12.
In short BOTH views are normally required for ID, one general view of its overall morphology and one of the 'rope' structure or the mid-filament reproductive cells.

See http://www.outerhebridesalgae.uk/marine/marine-species.php?id=40
and
http://www.seaweedsofalaska.com/species.asp?SeaweedID=49

Pylaiella littoralis is a brown 'cloud' epiphyte on Fucus seaweeds, I've seen it on F.serratus (its preferred host), F.vesiculosus and Ascophyllum nodosum but it may be found on others. Indeed it is often found apparently free-growing.
One needs a good glass (x10 is just OK) to ID this, as the spirally woven threads are almost unique to this. But to be certain Microscopy is needed.
See then, http://www.outerhebridesalgae.uk/marine/marine-species.php?id=40

The Red Wasp tends to look like any wasp until you spot the overall 'redness' or the reddish spots. But they can only be confirmed by facial recognition - the iNat. AI ID system here isn't up to that. yet!
Visited yesterday by the Tree Wasp and the Red Wasp in the same hour. They are not common here.
See http://www.eakringbirds.com/eakringbirds2/insectswaspsidentification.htm?fbclid=IwAR3piG2ngoUIp3Aowpoopql2AunR1juf0XaRkgWKQT8LsJnsf0YOHu558NU

Colaconema caespitosum (J.Agardh) Jackelman, Stegenga & J.J.Bolton
An awkward red alga needing close examination. It is so like Rhodothamniella floridula seen here https://www.inaturalist.org/observations/18142388
This was found on limpets and nearby concrete surfaces but not yet on other algae. It is very tough yet soft to the touch. Only with a penknife was it possible to remove a portion to examine at home. To separate the fine red filaments took quite an effort with tweezers. This is not like the long stranded easy to pluck sand binder.
Picture 1 shows the area around the limpet grazed and one can see that the limpet itself is not grazed. Though I believe they DO graze each other's shells.

See
http://www.seaweed.ie/descriptions/Colaconema_caespitosum.php
and
http://www.algaebase.org/search/species/detail/?species_id=14661
and
http://www.aphotomarine.com/red_seaweed_colaconema_caespitosum.html

Bonnemaisonia hamifera Hariot, 1891 The filamentous Trailliella phase
So probably NOT
Asparagopsis armata - Falkenbergia phase

This will not be an easy agree but the evidence is below - they are very similar.
http://www.algaebase.org/search/species/detail/?species_id=9
and
http://www.aphotomarine.com/red_seaweed_bonnemaisonia_hamifera_trailliella_phase.html
and
http://www.algaebase.org/search/species/detail/?species_id=9&sk=20
...
Similar to
http://www.aphotomarine.com/red_seaweed_asparagopsis_armata_falkenbergia.html

The Genus Ulva are not easy to get to species. One must present either strong evidence, via microscopy or properly researched evidence.
One picture of a green narrow strand or mess will not stand up. It needs proper photo-evidence. Ideally some close ups are required to SHOW the distinguishing features.
However, perhaps the easiest Ulva is this one. When located it should look like green intestines and ideally will have floating expanded tubes, contorted, twisted and showing some nearly transparent sections. It should be sampled in and out of water. Out of water it may appear flat but must be hollow. In water will inflate and often float.

Whilst microscopy may be necessary to ID beyond doubt, few people can ID it from the cell structure. And so we are left with the need to illustrate it thoroughly. I hope I have.
Here, where I live it grows in luxuriously clean seas, fairly high on shorelines. It tolerates low salinity but not excessive drying
See https://nas.er.usgs.gov/queries/greatlakes/FactSheet.aspx?SpeciesID=1714&Potential=N&Type=0&HUCNumber=DGreatLakes
and
http://www.seaweed.ie/descriptions/ulva_intestinalis.php

This occurs on both Fucus serratus (Saw wrack) and Fucus vesiculosus (Bladder wrack) see https://www.inaturalist.org/observations/17877449.
It MUST be worth looking for when sifting through well established fucus, near the bottom on the tide (low in the zone)
It is distinctive and possibly cannot be confused with others.
I am always trying to demonstrate that one picture is rarely enough and close-ups are desirable. Photos in and out of water help tremendously.
But with most species, microscopy is not required IF you can show the main features.
Try to show scale or say the size. Adding ID notes, IF you know what it is, will help educate others.

This then, grows as soft tufts (small shrubs) on the upper surfaces or at the edges of Fucus vesiculosus:
♥ brown,
♥ soft
♥ tufted
♥ up to 2cms long
♥ epiphytic on Fucus

We need to take our time over seaweeds. It is rarely sufficient to show one view of a washed-up frond.
Take time to tease it out a bit in-situ and shoot it several times.
Please show scale and drop a bit in the water and show it immersed. Look for any possible distinguishing features and shoot those too.
It is usually far too late when home and forming the Observation which is why I often take a piece home and lay it on a light-table for a last look.
Do add some notes to your observation:
♥ deep, translucent red;
♥ long narrow straps as fronds;
♥ smooth (slippery) and tough;
♥ short oval stipe;
♥ attached to Kelp stems;
♥ lovely edge-leaves etc..

Oh yes, it's worth the effort and everyone gains.