Asplenium vespertinum
Encyclopedia
Asplenium vespertinum is a species of fern
Fern
A fern is any one of a group of about 12,000 species of plants belonging to the botanical group known as Pteridophyta. Unlike mosses, they have xylem and phloem . They have stems, leaves, and roots like other vascular plants...

 known by the common name western spleenwort. It is native to southern California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

 and Baja California
Baja California
Baja California officially Estado Libre y Soberano de Baja California is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is both the northernmost and westernmost state of Mexico. Before becoming a state in 1953, the area was known as the North...

, where it grows in moist, shady, rocky places, such as the shadows beneath cliff overhangs.
The leaves grow in dense clusters and are up to about 30 centimeters long. Each is made up of 20 to 30 narrow leaflets with lobed edges. There are a few sori
Sorus
A sorus is a cluster of sporangia .In fungi and lichens, the sorus is surrounded by an external layer. In some red algae it may take the form of a depression into the thallus....

on the underside of each leaflet.

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