The La Sal Mountains in eastern Utah, USA, contain the only alpine habitat on the Colorado Plateau in Utah. These unique sky island alpine communities are vulnerable to a wide range of disturbances, including factors associated with the recent introduction of mountain goats (O. americanus). In order to monitor the potential impact of O. americanus, and other disturbances on alpine communities in the La Sals, we provide baseline estimate population densities for ‘Wyoming range lichens’ (Xanthoparmelia wyomingica) at two sites near Mount Laurel. Using the point-centered quarter and the quartered-neighbor methods, we estimate ca. 20 individuals/m² at both sites. These estimates provide an important baseline for long-term monitoring of vulnerable alpine sites on the Colorado Plateau.

Pseudoscleropodium purum, a species with a world-wide anthropogenic-driven distribution, is newly added to the moss flora of New Jersey on the basis of a collection made by Clyde F. Reed on 13 December, 1991. A species description, illustrations and a map of its world distribution are given. Pseudoscleropodium purum is often confused with Pleurozium schreberi; the two species are contrasted and their distinguishing feature outlined. The voucher specimen is deposited in MO.

Gregorella humida was found in western Oregon, U.S.A. This is a new genus and species for North America, with both fertile and sterile collections. An ITS sequence demonstrated its affinity with European material. This minute, granular to branched-granular cyanobacterial lichen is a pioneer on recently disturbed soil. The species was previously known from Fennoscandia, the U.K., continental Europe, and Turkey.

In 2016, a storm blew over an old growth sand post oak tree (Quercus margarettae) at O'Leno State Park in northern Florida. This event provided access to the entire tree without climbing it. Because the tree was suspended by its branches so it was parallel with the ground, we could easily observe and collect lichens at all former canopy heights. We surveyed the wind-blown tree's lichens before the species' composition changes had occurred. Several uncommon lichens were found on this oak. We rated relative abundance of each lichen species on the tree for three consecutive years. To our surprise, many of the lichens were still alive after one or more years, despite being in a lower canopy position and on a different aspect. However, most lichens changed in relative abundance or were reduced in abundance; one species, Parmeliella triptophylla, increased in relative abundance. Five species did not change, while 26 species decreased in abundance. Lichen response was dynamic in both abundance and thallus size. We found many old growth lichen indicators for Florida and this gave us an opportunity to study rarely encountered lichen species.

Gyrophthorus perforans, previously known as a parasite on Umbilicaria vellea and U. hirsuta in Spain and Italy, is reported from Washington state in the Columbia River Gorge, where it was found infesting Umbilicaria phaea. The blistering infections make the host thallus resemble Umbilicaria subg. Lasallia. Historical records of Lasallia from the Pacific Northwest were checked for Gyrophthorus and found to be misidentifications of other Umbilicaria species, but additional records of Gyrophthorus were not found. Lasallia pensylvanica is confirmed from Alaska and British Columbia along with a single historic location in California, but has not yet been found in Oregon or Washington. Western North American Umbilicaria specimens with blistered surfaces should be checked for the parasite Gyrophthorus before assuming they belong to Umbilicaria subg. Lasallia.