Asplenium ruta-muraria

A very delicate, feathery, light green rare fern growing on limestone rocks

Asplenium ruta-muraria wallrue

Plant grows in the wild/spontaneouslyPlant is native to PA

Wall rue is a rare fern, very delicate, feathery, of light green with branched clusters of small, long-stalked pinnae with stalked and palm-shaped pinnules, growing on basic rocks (limestone).

The species name 'ruta-muraria' was given to this fern by Linneaus from the Greek, meaning 'rue of the wall', as the fern prefers to grow on limestone rock and its leaves are reminiscent to those of meadow rues.

Could be confused with Pellaea atropurpurea.

Grows on sheltered boulders and cliffs, in smallest seams or crevices of limestone and other calcerous rock outcroppings, never in open sun.

Range is from Vermont to Michigan, south to Alabama and Missouri.

Wetland code: Not classified

Blade  olive or bluish green, smooth, somewhat leathery and feathery, grows to 7 in long.

Pinnae  widely spaced, stalked, with 2-7 widely spaced pinnules, alternate.

Pinnules  amostly fan-shaped on distinct stalks, edges fringed, indented or toothed.

Rachis  green, smooth, dull, grooved in front and delicate with very sparse, tiny hairs.

Stipe  usually longer than blade ( up to 3 1/2 in long), very slender, grooved in front, smooth and green, except at the

very base where it is dark brown and somewhat scaly.

Rhizome  short, ascending or creeping (ascending more common) with many old, dead stipes attached.  Covered with many tiny, pointed, dark brown scales hidden among roots.

Sori  short and narrow, often massed together and cover the whole underside of the pinnule completely.  Indusium  whitish with hairy edges, delicately membranous.

Predominantly grows on limestone rock.

S-rank:  No rank
G-rank:  G5 (Secure)

Asplenium ruta-muraria wallrue

Plant grows in the wild/spontaneouslyPlant is native to PA

Asplenium ruta-muraria gallery
Common Names