metamorphic crustose变质表壳岩
crustose lichen[植] 壳状地衣;壳状地衣
Crustose lichens壳状地衣
crustose -lichen stage壳状地衣期
"crustose lichens"
ADJ(形容词) having a crustlike appearance 外壳状的 [biology]
crustose lichens