地衣 is read as ちい (chii) and means lichen.
ちい
chii
ちいしょくぶつ
lichen
ちいるい
lichens
にっぽんちいがっかい
Japanese Society for Lichenology
ちいき
area
ちかてつ
subway
ちたい
zone
じしん
earthquake
ない
ちへいせん
horizon (related to land)
ちく
district
ちし
topography
じはだ
surface of a sword blade