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Mark Powell Profile picture
@obfuscans3
Jan 30, 2022 • 6 tweets • 2 min read • Read on X
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A thread with a few grey 'parmelioids' from my walk today.
Punctelia subrudecta (left), Parmelia sulcata (right) Image
Hypotrachyna revoluta (left) with erect lobes, the apices covered in fine soredia.
Parmelia sulcata (right) with angular lobes and white tipped ridges. Image
Parmotrema perlatum, may be confused with H. revoluta (last tweet) at first glance (both have fine soredia on apices of erect lobes) but with a little experience they are quite easily distinguished. Image
Punctelia subrudecta (left)
Hypotrachyna afrorevoluta (right) Image
Punctelia jeckeri (left)
Parmelia sulcata (right) Image
This little thread is not intended as an identification guide. It is just a few side-by-sides of some common grey parmelioids to show how similar/different they are in overall appearance.

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More from @obfuscans3

Mark Powell Profile picture
Jan 8
Lichen mosaics seem like confusing puzzles to beginners. Once you can recognise basic growth forms such as placodioid, they can be broken down into manageable groups. This list is relevant to churchyards across much of lowland England.
Thread Image
Caloplaca flavescens vs. C. aurantia
More C. aurantia vs. C. flavescens
Read 8 tweets
Mark Powell Profile picture
Feb 27, 2023
A thread about the lichenicolous fungus Laetisaria lichenicola, including the surprising way it was added to the British list in 2015 and hints about identifying/recording it. Image
New British species aren't always discovered by the established experts. Image
With experience, L. lichenicola can sometimes be recorded on sight in the field but a certain amount of caution is advised. Image
Read 5 tweets
Mark Powell Profile picture
Apr 29, 2022
Micarea curvata is a very inconspicuous lichen. I had the privilege of being present when the first English occurrence was found, in the company of Brian Coppins who originally described the species. Image
Although the 'Flora' gives the habitat of Micarea curvata, more detailed guidance would help people to locate colonies of it in lowland churchyards. ImageImage
The specific epithet relates to the curved ascospores. ImageImage
Read 6 tweets
Mark Powell Profile picture
Apr 29, 2022
I have a lot of anecdotal information about various lichens, along with copious notes from my own observations. This thread is about Lecanora antiqua, described as new to science by Jack Laundon in 2010.
Ivan Pedley suspected two taxa were involved, a suggestion I still find somewhat persuasive. Jack Laundon didn't mention this possibility when he described L. antiqua.
Can anyone find L. antiqua on relatively modern stonework?
Read 11 tweets
Mark Powell Profile picture
Feb 1, 2022
A few more parmelioids (Parmelia and related genera) from my walk today.
Can you detect the yellowish tinge in this Flavoparmelia caperata (pure grey Hypotrachyna at top right for comparison).
Flavoparmelia caperata in lower half, Hypotrachyna revoluta above. Again the subtle difference in colour which can only be accurately judged when the lichens are dry (they all become greener and rather similar in colour when damp/wet).
Here we have the two British Flavoparmelia species side by side. Similar colour. F. caperata (left) tends to be more robust, soredia coarser, produced in pustular soralia. If in doubt a simple chemical test will distinguish them.
Read 13 tweets
Mark Powell Profile picture
Feb 1, 2022
When dealing with mature specimens, Ramalina farinacea (left) can usually be readily distinguished from Evernia prunastri (right) and learning to separate them is a good exercise for beginners and improvers.
Thread.
Evernia has a slightly matt texture (perhaps like fine tissue) whereas Ramalina is more cartilaginous (as if moulded in plastic). The undersides of Evernia branches are usually starkly different (white) to the upper side. In Ramalina underside similar or only slightly paler.
The soralia of Ramalina farinacea are usually neatly oval in shape and restricted to edges of branches. The soralia of Evernia are irregular in shape and are not restricted to edges of branches.
Read 5 tweets

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