Tortula muralis
Tortula muralis ssp. muralis - Peristome well developed, with spirally twisted filiform teeth; var. muralis - long hyaline hairpoint; var. aestiva - short point. Tortula muralis ssp. obtusifolia (former name Tortula obtusifolia) - Peristome mostly reduced, sometimes without filiform teeth. T. muralis obtusifolia and T. muralis muralis var. aestiva both have short hairpoints and difficult to distinguish. T. muralis muralis var. muralis are very similar to T. muralis muralis var. aestiva but have longer hairpoints. Tortula lingulata is easily distinguished from T. muralis ssp. muralis even in the field. However, for distinguishing between T. lingulata and T. muralis ssp. obtusifolia, spore size is the best character. / However, according to many specialists, this taxonomy may be misplaced and the main role may be played by an environmental factor, strongly modifying the appearance and causing erroneous data, which, not supported by long observations, are eagerly published because the paper counts, sad but often true.
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This may be true in some geographical regions, but you need to use a flora or key that is meant for the region of study in order to achieve an accurate ID.
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