Hi wasabi8888,
how long have it been tied to the wood? and do u see any new growth out of the tied fissidens? it all depends, if there is growth and you are confident that it already stick to the wood then its okey to remove it but if not either let the thread be there (if does not cause any obstruction) or my suggestion tied a newer thread over it so as to hold it long enough untill the fissidens stick to the wood.
Hope my opinion helps.Good day.
Jumali
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