Thanks once again, Jo! I must look through the whole celebration series as I only know a bit about one, Stackhouse of Fucus fame and why I went to Stackhouse Cove recently. Some learning for the winter, methinks!
Sphaeroblast, courtesy of Mark Wilson
Quite good
Added to https://www.ispotnature.org/communities/uk-and-ireland/view/project/845442/
accessible through 
SOME iLinks
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Thanks. Thatâs pretty comprehensive. Does anyone know of anything similar for other groups? I think something along these lines on insects would be particularly useful, perhaps followed by fungi and lichens.
I cannot vouch for its authority but insects are covered by: https://extension.oregonstate.edu/sites/default/files/documents/9591/external-morphology.pdf
I watch here and add âstuffâ to this
Readers of this forum topic may be interested in this observation, well the paper linked to it: Twice bitten 2 | Observation | UK and Ireland | iSpot Nature
I stuck that paper in as it supposedly answers the question as to whether morphology, chemicals and DNA can all separate out taxa for a difficult group such as Peltigera lichens.
I know this is a bit tangential but this blog post has the most incredible list of references down the right-hand column. The one on beetle morphology, for example, is potentially very helpful. There are also articles on subjects such as âcollectingâ insects (i.e. taking live specimens for examination) and a reference to German beetles with photographs.
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Resurrecting an old post but I just came across https://www.facebook.com/photo?fbid=502112205714640&set=pcb.502112309047963&locale=en_GB. Hover over the illustration and follow the right/left arrows for further examples.
Having been reminded of the thread - see linked for hypopodium and interpetiolar stipule.
Honeysuckle | Observation | UK and Ireland | iSpot (ispotnature.org)