Fay Newbery
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So sad. Nigel was always so willing to share his knowledge and enthusiasm for plant pathogens.
A great loss to the mycological community as well as to his family.
Thanks for sharing this update, Mark. This species has just turned up again in Yorkshire. Collected from a small streamlet in the garden at RHS Harlow Carr in Harrogate last week. My photo is not particularly good but all the appendages were there! Interestingly the species was seen in NW Portugal during work done in 2001-2002. See Pascoal (2005 ) Aquatic hyphomycete diversity in streams of Northwest
Portugal. Fungal Diversity 19: 109-128
I don’t think there are any reliable macro features that will separate these leaf spots. I always reach for my microscope. Sadly there were only six records of T pertusariicola on Ophioparma by Aug 2023 (and one on Pertusaria pseudocorallina). I know it’s been seen in Cumbria, Devon and three Scottish counties. But many sightings have not yet made it through to a record in the BLS database. I’ll look forward to seeing your LF records next time I get a download!
T delicata has been recorded at least once in the UK on Lecanora hybocarpa in vc 11. This looks like a good ID to me and a good find. I suspect that most people who saw this would assume that it was a random overgrowth of something not associated with the lichen and therefore ignore it. Please note that T pertusariicola is present in the UK. Most records on Ophioparma ventosa.
Amazing photographs! Did you look at this microscopically? Otherwise I doubt if an ID will be possible. I’m just looking at some young, green crustose thalli. I’d describe them as ‘granular’ rather than sorediate. The margin has a beautiful feathery prothallus. All of the three thalli have brown imbedded pycnidia with a slightly raised thalline rim. The pycnidial walls are colourless except around the ostioles. Conidia are strongly curved and match the possible Lecanora pycnidia shown in this thread. LGBI2 has so little information on pycnidia but the description fits the information that is available. If my chemicals are reliable, the thallus is C- and K-. I have no idea what species these thalli are. It’s probably something that will produce fruit as I get lost in Key 7e after couplet 41 in LGBI2.
Found on three year old, smooth, apple twig in Surrey. the thallus is much greener than in the photo here but the prothallus is pure white.
I’ve found areas of the basidima of Erythricum aurantiacum without associated bulbils before. In the case that I saw, the bulbils were on top of a decaying thallus and the basidia were under the thallus where the air would have remained more moist. Microscopy is needed to confirm. Could your sample be a hyphomycete, Neil?
I’m pretty certain that you can rule out powdery mildew. But I’ve no idea what this is. From the photos I can’t even confirm that it’s fungal – although it could be. September 9, 2022 at 9:42 am in reply to: Whats the difference between a diaspore and a soredium? #44836Welcome to the fascinating and beautiful world of lichens. If you’d like to learn more about lichen structure and terminology, try the online learning course here:
https://britishlichensociety.org.uk/learning/learn-the-language This looks good for a powdery mildew. Only one species reported on Dipsacus fullonum in latest paper by Ing (2021). Now called Podosphaera dipsacacearum. Have you made a slide to check for powdery mildew characteristics?
Jassy Drakulic from the RHS comments that these do look like young A. gallica. She says that a good test is to look in the surrounding soil for rhizomorphs. This species produces copious black rhizomorphs. -
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