Lowland fens meadow winter snow ice, Hrdiboricke ponds icy frozen Bolboschoenus maritimus, icy frozen,endangered habitat and a natural monument, reed common broadleaf cattail common, cattail bulrush or great reedmace, Typha latifolia, desert ground mud, global warming fissure, drought dry dries threat of desiccation, national natural monument reserve, Czech Republic, Europe