Fissidens dubius Rock Pocket-moss

Similar to Fissidens adianthoides, but often smaller and more likely to be found in drier condition on base-rich rock such as limestone or on mortar on old stone walls. Microscopic examination of cell size and cell structure in the leaf is sometimes necessary to separate these two species. Both species have a distinct pellucid marginal band of cells in the leaf which can usually be seen with a hand lens. It is widespread in Britain except in parts of middle and southeast England. It is common in Wales. In West Glamorgan it is particularly frequent on the limestone of the south Gower coast and scattered elsewhere, mostly in the lowlands.  Sporophyte capsules are occasional in this autoicous moss.