Common club moss, also known as running pine or stag’s horn moss (Lycopodium clavatum), has creeping stems up to 3 metres. It grows in bogs and other wetland habitats nearly worldwide, and many species are native to tropical areas of the Americas. The spores of this moss, "lycopodium powder", are explosive if present in the air in high enough densities. Since moss holds water, you can put a layer of moss on your shelter and it will absorb the water and keep you dry. It can also act as an insulator of both heat and cold, to be used in a variety of ways. Club moss spores and teas from plant leaves have been used since ancient times in both American Indian and European cultures.
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