It has a "distinct bend" in its nerve, which characteristic is only mentioned in the blurb about F. celticus (Welsh Pocket-moss which also grows in the west of Scotland), but I found capsules with my sample and apparently F. celticus doesn't produce capsules.
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| showing "distinct bend" in the leaf nerve |
If the photo to the left is enlarged by clicking on it it's possible to see that the leaves are bordered which also rules out F. celticus.
I wondered about F. curnovii (Curnov's Pocket-moss) because of rhizoids in the mud that looked slightly reddish under the microscope. However, they could just be a bright brown. F. curnovii is said to have a more heavily thickened border than F. bryoides which it ressembles. I wouldn't describe the leaf borders I could see as heavily anything.
And so I am plumping for Fissidens bryoides (Lesser Pocket-moss) which has the virtue of being 'common' for a start and whose setae arise terminally on the shoots. I couldn't see any "bud-like male organs" in my sample. Here are some pics of capsules at various stages and another of leaves.
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