While Carrizo Plain (California, USA) is a hotspot for rare and endangered species, little effort has been made to sample the lichen flora of the Plain. To assemble a preliminary checklist of lichens from the basin floor of Carrizo Plain, we sampled along a transect from the basin's alkali complex to its western edge, as well as from clay slickspots with high sodium content, and a rocky site in the eastern Plain. We document a substantial lichen flora on the Plain and note several collections that were the first record for a species in the region: five species were the first in San Luis Obispo County, and nine were the first for the San Joaquin Desert. We include notable collections and observations on potential ecological patterns and highlight Carrizo Plain as a promising hotspot for research on lichen ecology, particularly for species adapted to extreme environmental conditions.

From recent surveys of Piedmont rocky river habitats, 22 noteworthy species of lichens and two lichenicolous fungi are presented, including 18 species new to North Carolina, three new to eastern North America, three new to North America and three potentially new to science. Most taxa here reported include amphibious lichens and lichens that otherwise are found in exposed, arid environments.

The 2023 checklist for Pennsylvania bryophytes lists 547 taxa including 426 mosses, 118 liverworts, and 3 hornworts, but only 48 confirmed moss species and one liverwort species collected during the last 100 years from Perry County. As a result of fieldwork reported herein and review of herbarium data from 1923 to present, an additional 49 moss and 2 liverwort species are now included in the Perry County bryoflora. Significant bryophyte species reported from the county include the moss Bucklandiella venusta, which represents the first collection of this species in Pennsylvania during the past 100 years. Currently, 97 moss and 3 hepatic taxa are reported from Perry County, Pennsylvania.

Philonotis breutelioides, described new in 2022 as a California endemic within fen communities, has recently been found in Oregon. Provided is a site description and a range map depicting occurrences from both California and Oregon.