Tetraphis Pellucida Moss, Living, Fresh, Gallon Bag Great for Terrariums! 1 Square Foot.  Great for Terrariums! Tetraphis Pellucida Moss, is a very unique moss that loves marshy areas. This is untreated all natural moss, shipped directly to the customer. Has a shelf life of 2 to 3 weeks if kept refrigerated and misted. 1 Square Foot of moss.