apioperdon autumn beech belgian belgium bodies body britain british broad-leaved broadleaf broadleaved close close-up close-ups closeup closeups cluster clusters decaying deciduous europe european fall forest forests france french fruit fruits fungi fungus German germany great group groups Kingdom lycoperdaceae lycoperdon mushroom mushrooms nature netherlands pear-shaped puffball puffballs pyriforme saprobic stump toadstool toadstools tree trees uk United up ups wood wooden woodland