|Finger Fern in the rainforest below the summit of Mount Imlay, Australia The pale green plants are moss|
Notogrammitis billardierei, the common finger-fern or strap fern is a small fern growing in high rainfall areas of south-east Australia and in New Zealand. A common plant, growing on branches, logs or on rocks in and near rainforest.
Strap-like leaves are 5 to 15 cm long, and up to 10 mm wide. Occasionally broader at the end than at the base of the frond. The sporangia are grouped into sori, which grow on the underside of the frond, in irregular patterns. The sori are not round, as in many grammitids, but long and thin.
- Barbara S. Parris. 1998. "Grammitidaceae" pages 450-468. In: Anthony E. Orchard (executive editor) and Patrick M. McCarthy (volume editor). Flora of Australia volume 48, Ferns, Gymnosperms, and Allied Groups. ABRS/CSIRO: Melbourne, Australia.