at the base to appear heart-shaped). They are about long and wide, overlapping, and sometimes conceal the final subdivisions of the leaf from below. Those closer to the base of the costa are ciliate. The smallest divisions of the leaf are round or slightly heart-shaped, beadlike in appearance, not exceeding across and concave below. The upper surface of the leaf is glabrous (free of hairs). The lower surface of the leaf is covered in ciliate scales, similar to those of the costa but reduced in width so as to appear like branched hairs in some cases, more or less concealing the surface. On fertile fronds, the sori are protected by false indusia formed by the edge of the leaf curling strongly back over the underside, often concealing the sori. The recurved edges are only a little modified in comparison to the rest of the leaf tissue. They are wide, with entire margins. The sori contain brown spores, with 64 spores in each sporangium. Specimens from some of the northern Channel Islands are larger, with more dissected scales, and have been referred to as "var. clokeyi", but this name has never been formally published. M. clevelandii is quite similar to M. covillei, usually found more inland. In the latter, the reduced, hairlike scales are not present on the abaxial surface of the leaf tissue, while the scales on the abaxial surface of the costa are larger and lack cilia except on their basal lobes. Taxonomy The species was first described in 1875 by Daniel Cady Eaton as Cheilanthes clevelandii. He named it for Daniel Cleveland, the collector of the type specimen, which came from "a mountain about forty miles from San Diego, California". By a strict application of the principle of priority, Oliver Atkins Farwell transferred the species to the genus Allosorus as Allosorus myriophyllus var. clevelandii in 1931, that genus having been published before Cheilanthes. Farwell's name was rendered unnecessary when Cheilanthes was conserved over Allosorus in the Paris Code published in 1956. The development of molecular phylogenetic methods showed that the traditional circumscription of Cheilanthes is polyphyletic. Convergent evolution in arid environments is thought to be responsible for widespread homoplasy in the morphological characters traditionally used to classify it and the segregate genera that have sometimes been recognized. On the basis of molecular evidence, Amanda Grusz and Michael D. Windham revived the genus Myriopteris in 2013 for a group