We tend to record Diploscistes muscorum when parasitic on Cladonia (as here, from dorsetnature.co.uk/pages-lichen/l…) and D. scruposus when growing directly on rock. There are supposed to be microscopic differences but my observations seem difficult to resolve with the literature.
Thread:
Today I came across a colony growing on moss, no Cladonia in sight, on a gravestone. The number of spores per ascus fits muscorum while the septation of the spores fits scruposus! This not the first time I have noticed this problem.
The asci are consistently 4-spored which is supposed to be a D. muscorum trait.
Mature spores have more than 5 transverse septa which is supposed to be a D. scruposus trait. How do I decide which name to apply to this colony?
I stare blankly into the opening of one of the strange fruiting bodies, which combine characteristics of both perithecia and apothecia.
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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
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.
New British species aren't always discovered by the established experts.
With experience, L. lichenicola can sometimes be recorded on sight in the field but a certain amount of caution is advised.
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.
Although the 'Flora' gives the habitat of Micarea curvata, more detailed guidance would help people to locate colonies of it in lowland churchyards.
The specific epithet relates to the curved ascospores.
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?
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.
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.