Daniel Greenwood

The language of leaves

Posts tagged ‘xanthoria parietina’

Fungi Friday 8th January 2021

Once again in England we have to stay at home to stop the spread of the horrific Coronavirus, with only one exercise trip outside allowed each day. When I’ve been heading out I’ve been passing through a local churchyard and cemetery on some days. These are the perfect places to find lichens, especially where there are old gravestones and trees. I thought I would kick off #LichenJanuary by looking at one of the most common lichens, which may help people to gain an interest and see that there is a way in. To identifying them, rather than becoming one.

A quick intro to lichens. Lichens are a partnership of fungi with either algae or cyanobacteria. The fungus provides the physical structure for the organism and the algae or cyanobacteria turns sunlight into sugar through photosynthesis. Fungi, to my knowledge, are not able to photosynthesise. This is another reason why fungi partner with plants, which of course are able to harvest sunlight for food. There are a number of species on the branch seen here. The most prominent species is showing off its cup fungi, a type of ascomycete (ass-co-my-seat). Ascomycetes produce spores in the ‘ascus’ (singular) or ‘asci’ (plural) and shoot them out. Most mushroom-type fungi are basidiomycetes, which drop spores from the ‘basidia’ in the gills.

Now, fungi are hard to identify, and lichens can be even more difficult. That is such a massive understatement, because some fungi will never be seen and some lichens you just won’t ever notice. We’re talking generally of things you are likely to see in your life. Above and below is a common European lichen, tolerant of air pollution, which many lichens are not. It’s the golden shield lichen, Xanthoria parietina. If you want to learn more about lichen ID I would really recommend using iNaturalist which has good artificial intelligence and also some experts floating around who will help you to ID them.

Here’s another close-up of the golden shield lichen. It really can be found all over, and looking at its behaviour above, you can see why. It is a dominant species in urban areas.

From the top of the image above you can see Xanthoria creeping in on some rather pretty lichens. This is my favourite ever lichen photo. I spotted this fallen poplar branch several days before I took this photo and returned again to capture it.

Here’s Xanthoria with a hint of its pale blue colouring. Like other species which benefit from the increase of nitrogen dioxide in the atmosphere and the soil, nettles and brambles, for example, I think Xanthoria is a symbol of our impact. As things change over time, I wonder how its dominance will shift over time.

Next week: pixie cup lichens!

Thanks for reading.

Further fungi

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Fungi Friday, 14th February 2020

Storm Ciara blew in on Sunday and probably washed any winter shrooms away. But I’m still spending my time with the symbiotic fungal folk found in lichens. The lichens have had a good week, heavy rain has been interspersed with some lovely winter sun.

Near where I work there are lengths of low post-and-rail fences that are covered in lichens. They’re likely to be sweet chestnut and not to be treated with any chemicals. This patch above is a joy, a mass of cladonia cup lichens with mosses and some crustose lichens smattered in between.

This is probably Xanthoria parietina which is a very common yellow lichen. I think it looks like scrambled eggs! The colours have only been very mildly edited here, it really was vibrant.

These are the fruiting bodies of the cladonia cup lichens in the previous image, far more alien-like.

These fences are close to the river Rother which was flooding the surrounding landscape in an epic manner. It’s done it twice now this year.

As you can imagine, for the mushrooms of the fungal world, this is too much water!

This is a dead alder tree that sits in the centre of the river. You can see the blue-green hue from the riverbank, the presence of lichens enjoying a sunny and moist spot to prosper in.

Next week I will actually have some 100% fungi to share!

More fungi

How mushrooms are helping to fight poverty in China – Time

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Rother - 28-1-2020 AL (14)

Fungi Friday: 31st January 2020

Anyone who works full time and is trying to keep weekly photographic habits alive will know the challenge that is January. Lunch breaks (if they continue after Bre*it) are the saving grace. This week I got out a couple of times and rescued my pseudo-Fungi Friday. Why pseudo? Because lichens are a mixture of organisms fused together through the evolutionary benefits of their respective differences. As Britain enters the transition phase of leaving the European Union, what better example can you find for the prosperity of working closely together. Algae, cyanobacteria, fungi, together they become so much more than the sum of their parts. Together they created the first soils from seemingly indestructible rocks.

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The beautiful diversity of life is what makes our world unique, it’s also what makes it live. As we continue to wreck biodiverse landscapes and our ways of farming, building and emitting eradicates species on a scale only seen five times previously in the 4billion years Earth has been a thing, we can’t forget that. Thankfully, lots of people haven’t. Lots of them will be tomorrow’s policymakers and, living with the anxiety of the planet’s poor health, will bring much-needed change.

This attempt to photograph fungi all year round is a silly mission but it has challenged me. In trying to find something to photograph, it’s taken me to read more on the diversity of fungal life that exists in the absence of typical mushrooms. One week I may have to post a photo of the black mould a former landlord is blaming me for. It has also taught me that most of my photography is in fact built around dead stuff. This doesn’t half make you look odd in the real world.

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Just like the march of unsustainable consumer-based economies, we should be mindful of the spread ofย Xanthoria parietina, a pollution-tolerant species seen here in bright yellow making its way across the lichen community.

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Lichens are good indicators of air quality, due to their intolerance of nitrogen dioxide and sulphur dioxide. These chemicals are produced through emissions from pollution caused by car engines and from farming chemicals respectively. My studio this week is an abandoned poplar plantation along the river Rother in West Sussex surrounded by arable farming. If you look at the uppermost branches in the image above, you can see the spread ofย Xanthoriaย in the golden glow it creates.

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Here it is once more, spreading across more species of lichen on a fallen poplar.

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Lichen has saved my photographic January. Whether you use your phone or anything else, I know I’m not the only one.

I’m not just lichen it, I’m lovin’ it!

Fungal decisions can affect climate

Ash trees recovering from ash dieback in Norfolk

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