Weft Fern
Weft fern, Crepidomanes intricatum, synonym Trichomanes intricatum, is an rare and unusual fern. It exists only in the gametophyte stage. This is the haploid stage.

The weft fern is has a limited environment. A cave or cave like environment is required.
Weft fern is only one of two haploid ferns in the Northeast.
Rattlesnake Mountain, White Mountains National Forest, Rumney, NH, USA
The dark green coloration at the top of the ceiling is the Weft fern. It can be confused for moss or lichen.
Rattlesnake Mountain, White Mountains National Forest, Rumney, NH, USA