Đia y la mot dang ket hop giua nam (mycobiont) va mot loai sinh vat co the quang hop (photobiont hay phycobiont) trong mot moi quan he cong sinh. Photobiont co the la tao luc (thuong la Trebouxia) hay khuan lam (thuong la Nostoc). Hinh thai hoc, sinh ly hoc va hoa sinh hoc cua đia y rat khac biet voi nam va tao rieng biet. Đia y ton tai o mot so moi truong khac nghiet nhat the gioi đai nguyen bac cuc, sa mac, bo đa. Chung rat phong phu tren cac la va canh cay tai rung mua va rung go, tren đa, ca tren tuong gach va đat. Noc cua nhieu toa nha thuong co đia y moc va phat trien.
Đia y rat pho bien va co the song lau; tuy nhien, nhieu loai đia y de bi ton thuong khi thay đoi thoi tiet đot ngot, chung co the đuoc cac nha khoa hoc dung đe đo muc đo o nhiem khong khi, hay huy hoai tang ozon. La thuc an chu yeu cua loai huou Bac cuc.
Đia y co the dung che tao ruou, nuoc hoa, pham nhuom cung nhu trong y hoc. Uoc tinh rang 6% be mat phan đat lien cua Trai Đat đuoc phu đia y. Tai Scotland, pham nhuom tu đia y đuoc goi la crottle.


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Lien ket ngoai Đia y tai Tu đien bach khoa Viet Nam
Lichen (biology) tai Encyclopædia Britannica (tieng Anh)
LIAS light: an online interactive identification key for the lichen species of the World
University of Sydney lichen biology Luu tru ngay 11 thang 12 nam 2004 tai Wayback Machine
Memorial University's NL Nature project, focusing primarily on lichens Luu tru ngay 28 thang 6 nam 2019 tai Wayback Machine
ESA article on lichen survivability in low earth orbit
The British Lichen Society Luu tru ngay 3 thang 7 nam 2019 tai Wayback Machine
Lichens of Ireland Luu tru ngay 20 thang 12 nam 2014 tai Wayback Machine
Lichens of North America
Pacific Northwest Fungi Online Journal, includes articles on lichens Luu tru ngay 19 thang 6 nam 2008 tai Wayback Machine
Fungi that discovered agriculture Luu tru ngay 13 thang 5 nam 2007 tai Wayback Machine
Pictures of Tropical Lichens
High Resolution 1.5 Gigapixel Image of a Lichen Covered Rock
Good example of a Lichen
How To Grow Lichen Luu tru ngay 13 thang 3 nam 2016 tai Wayback Machine
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