Robert Shaw Egan

Punctelia graminicola is a species of foliose (leafy) lichen in the family Parmeliaceae. It grows on rocks, and, less frequently, on bark in North America, South America, and East Africa. It has a blue-grey thallus measuring up to about 15 cm (6 in), covered with tiny pores called pseudocyphellae. Sometimes the lichen forms small lobes that project out from the surface. Fruiting bodies are uncommon in this species; if present, they resemble small cups with a brown internal disc measuring 3–10 mm (0.1–0.4 in) in diameter. A lookalike species, Punctelia hypoleucites, is not readily

Parmotrema arteagum is a species of foliose lichen in the family Parmeliaceae. It was described as new to science in 1982 by Robert Egan. Found in west-central Mexico, the holotype collection was made in Arteaga, after which the lichen is named. It grows on the branches of oak and other deciduous trees in woodlands at elevations between 600–900 metres (2,000–3,000 ft). Parmotrema arteagum is a member of the Parmotrema perforans species complex because of its broad lobes with cilia at the margins, perforations in the apothecia, and lower surfaces with white borders that lack rhizines.

Xanthoparmelia arida is a lichen which belongs to the Xanthoparmelia genus. It is an arid shield lichen, and is uncommon. It is listed as apparently secure by the Nature Conservatory. It is noted for being similar to Xanthoparmelia joranadia.

Xanthoparmelia ajoensis is a foliose lichen that belongs to the genus Xanthoparmelia. The lichen is uncommon and is listed as vulnerable by the Nature Conservatory.

Punctelia cedrosensis is a species of foliose lichen in the family Parmeliaceae. It is endemic to Mexico, where it grows on the bark of conifers.

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