基本解释地衣化的； 地衣型的同根派生 英汉例句The stone stairway was covered with lichen.那石级长满了地衣。Lichen is a form in which green or bluegreen algae and a fungus live together symbiotically.地衣是一种绿藻或蓝藻与一种真菌共生的形式。