FLORA OF ICELAND elements: Phegopteris connectilis, Beech Fern, Þríhyrnuburkni

Phegopteris connectilis; The Beech Fern is characterized by the triangular bipinnate fronds on long stalks. The secondary leaflets are joined at the base, their margins only slightly wavy. A very distinct feature is that way the way the first primary leaflets are placed. They are slanted more or less backwards and upwards and the leaf-lobes are somewhat twisted to face the rest of the leaves. The second pair of primary leaflets are sometimes intermediate. The leaves have short white hairs on the nerves on both sides of the leaflets. The leaves grow from short horizontal rootstocks giving the plants a rather bushy-appearance
The sori containing the sporangia do not have indusia and are placed at the edge of the leaflets.
It grows in sheltered areas like lava fissures, undergrowth etc. It is reasonably common in the western regions of Iceland but rare elsewhere.
It is member of the Thelypteridaceae, Marsh-fern family. The Icelandic name for this species is Þríhyrnuburkni.