هاگ

thumb|300px|Spores produced in a sporic life cycle thumb|300px|Fresh snow partially covers rough-stalked feather-moss (Bryopsida|Brachythecium rutabulum), growing on a thinned hybrid black poplar (Populus x canadensis). The last stage of the moss lifecycle is shown, where the [[sporophytes are visible before dispersion of their spores: the calyptra (1) is still attached to the capsule (3). The tops of the gametophytes (2) can be discerned as well. Inset shows the surrounding, black poplars growing on sandy loam on the bank of a kolk, with the detail area marked.]]