As with many of these character tables, an element of judgement has to be made regarding what species to include, but tidy appearance is shared by all these species, as illustrated by the patch of Philonotis fontana
photographed in Cushnie Forest, Aberdeenshire. For this list, I've included the comparatively short erect shoots of the Polytrichums and allies, and also mosses with long shoots closely packed together - Bryum pseudotriquetrum
is almost carpet-forming and so perhaps doesn't satisfy the characteristic of being separate.
This appears to be a small category of mosses, and all the species in the table are actually quite varied in form, and favour varied substrates and environments. There isn't sufficient similarity to even begin to consider this growth form in adaptation terms.