Bacidina caerulea?

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February 9, 2025 at 7:36 pm #32998
RobYaxley
On a mature elder in ancient oak woodland in north Norfolk. Apothecia 0.2-0.4mm, ascospores +/- 35um, acicular, blue green tinge to the exciple and epithecium, hypothecium colourless. The nearest thing I could find was Bacidina caerulea (from a post in June last year on here). Does this look right?
February 9, 2025 at 9:29 pm #46495
Glos lichens
The habitat sounds very like the one I posted on 4 June last year – shady elder. Mine was in a very damp site, and maybe you rarely get that level of prolonged humidity in Norfolk.

The blue colour of your specimen also sounds right.

With my specimen, I was concerned about the friesiana/caerulea split, and was plumping for caerulea because I could see no brown pigments. I can’t really make out the colour in your section, so a different shot with the condenser aperture more open would be helpful.

But having said all that, I have little experience with Bacidinas so I hope some one else comments too!

Juliet
February 9, 2025 at 11:10 pm #46496
maxieput901
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This looks like Bacidina caerulea by the colour of the exciple. I recorded a similar lichen as B. friesiana back in 2014 which was probably prior to the split and remember the bluish tinge and the piebald apothecia. I imagine it was actually B. caerulea in fact.

It was also on elder bark and not in a particularly nutrient-rich community. I notice in LGBI3 that a liking for nutrient-enrichment is noted for B. friesiana and not for B. caerulea but perhaps the latter has not been widely enough recorded to comment yet.
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