Myriopteris covillei (Maxon) Á.Löve & D.Löve

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Myriopteris covillei, formerly known as Cheilanthes covillei, is a species of cheilanthoid fern known by the common name Coville's lip fern. Coville's lip fern is native to the southwestern United States and Mexico.

This fern has dark to medium green leaves (fronds) which may be up to 4-pinnate (made up of leaflets that subdivide up to 3 times), such that the leaflets are layered with overlapping rounded segments. The leaves as a whole have a bumpy, cobbled look when viewed from above. The edges of the leaflets are curled under (forming a false indusium) and their undersides have wide scales which are lengthened outgrowths of the epidermis. Tucked under the scales and false indusium are the sporangia, which make the spores. Myriopteris covillei can be distinguished from its very similar relative Myriopteris intertexta by the scales on the underside of the leaflets. These scales are up to 3 mm wide at their base in M. covillei, giving them an elongated triangular papery appearance, whereas those of M. intertexta are 1 mm wide, appearing more like a flattened thread.

Coville's lip fern is native to California, Baja California, Arizona, Oregon, and Utah.

It grows in rocky crevices in the mountains and foothills. In California it is found in chaparral, yellow pine forest, pinyon-juniper woodland, and Joshua tree woodland habitats.

Myriopteris covillei - Wikipedia

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