Cladonia strepsilis or the olive cup lichen is a species of cup lichen in the family Cladoniaceae. It is found in Asia, Europe and North America. In Iceland, where it is only found in a few locations in the Eastern Region, it is red listed as endangered (EN).Náttúrufræðistofnun Íslands [Icelandic Institute of Natural History] (1996). Válisti 1: Plöntur. (in Icelandic) Reykjavík: Náttúrufræðistofnun Íslands.
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