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Bryum sp.
very small, about 2 or 3 cm in height
Yes, those 2 species look very similar...I was puzzled too, but I really think its probably the Bryum dichotomum...
@despina, I also think the same, it is a Bryum genus. More likely to Bryum dichotomum
You should also check the Bicoloured Bryum (Bryum dichotomum)
http://www.biopix.com/bicoloured-bryum-b...
and the Bryum pachytheca
http://www.flickr.com/photos/stephenbuch...