Cornopteris

Cornopteris is very similar to Athyrium but differs in having sori without indusia. The species are all deciduous natives of Japan, China, Korea, and the Himalayas. The genus name is derived from corno, horned, and pteris, fern.

Cornopteris crenulato-serrulata (edged with small teeth), often found filed under Athyrium, is a deciduous species native to the same countries and habitats as C. decurrenti-alata. The 2-ft. (60-cm) triangular fronds are approximately half stipe and half bipinnate-pinnatifid blade. The species is hardy in Zones 5 to 8 and recommended as a lacy woodland contribution in partial shade.

Cryptogramma acrostichoides in the rock garden at the Rhododendron Species Botanical Garden.

Cornopteris decurrenti-alata (decurrenti, running down the stem, alata, wings or ridges), alternate spelling C. decurren-tialata, is in cultivation in the gardens of German specialists in Zones 6 to 8. The epithet is an apt description of this species, which has foliar tissue "running" down the rachis between the pinnae. The fronds of up to 3 ft. (90 cm) are bipinnate-pin-natifid and broadly lanceolate. Sori without indusia are linear or occasionally Y-shaped. The distinguishing feature, however, is a series of minute translucent spikes at the axis of the pinnae and the rachis on the upper frond surface. These would-be slivers are visible even on very young material. Give the species space and moisture in the back of the shady bed.

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