Collema flaccidum

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Chris Johnson
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Collema flaccidum

Post by Chris Johnson » Sun Jan 13, 2019 8:43 am

My first attempt at a Collema so thought it best to check with members for confirmation or correction. There are rather more species than I realised.
In an almost vertical channel in a granite outcrop. It was showing very dark and in shade so I have lightened the second image slightly.
Thank for looking.
Chris
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Collema-flaccidum-01.jpg
Collema-flaccidum-04.jpg
Collema-flaccidum-05.jpg
Collema-flaccidum-06.jpg
Collema-flaccidum-07.jpg

Neil Sanderson
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Re: Collema flaccidum

Post by Neil Sanderson » Mon Jan 14, 2019 9:28 pm

Chris

It is likely to be Collema flaccidum, but to confirm, you should see the young globose isidia, visible in your pictures, becoming flattened and squamule like as they age, see http://fungi.myspecies.info/taxonomy/term/4623/media. The alternative would be Collema subflaccidum, where the isidia remain globose, although this is a less likely species on a wet rock habitat.

Neil
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Untitled-1.png
Left C. subflaccidum & right C. flaccidum, from LGBI
Neil Sanderson

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Chris Johnson
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Re: Collema flaccidum

Post by Chris Johnson » Tue Jan 15, 2019 8:32 am

Thanks for that Neil.

Now had another thorough look and the isidia are entirely globose on all ages of the thallus. I used Dobson initially for reference and he notes the habitat as 'trees' for C. subflaccidum, so I dismissed it. However, Smith et al. note "... more rarely on siliceous rock; ..."

Given an almost complete lack of trees here, ...

Chris

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