boletus floor forest fungus mushroom nature Poland polish underwood vegetable vegetation Chanterelles food mushrooms cep grass appearance apricot-oyster-mushroom boletus-of-the-steppes commercial cook cooking cultivar cultivated distinctive edible eringii French-horn-mushroom fungi king-brown-mushroom king-oyster-mushroom king-trumpet-mushroom pleurotus-eryngii raw royal-trumpet savory savoury taste tasty texture textures thick trumpet-royale uncooked