maidenhair spleenwort
noun
(More fully common maidenhair spleenwort) a common spleenwort of rocks and walls, Asplenium trichomanes, which has simply pinnate fronds and a black rachis; (also, with distinguishing word) any of several related spleenworts.
Origin
Mid 19th century; earliest use found in William Macgillivray (1796–1852), ornithologist and natural historian.