There are currently 192 bryophyte species (156 mosses, 31 liverworts and 5 hornworts) documented from San Luis Obispo County, California. Similar to the vascular flora of the county, the bryophyte flora strongly reflects the transitional nature of the region, which lies near the intersection of the Coast Ranges and Transverse Ranges and supports a large and diverse set of vegetation types. Important floristic and biogeographic patterns include a distinctive suite of species from closed-cone coniferous forests and several noteworthy intrusions of Mojave Desert species into the Coast Ranges. A high proportion of species are known from the county from only one or a few collections, indicating that additional floristic work in the county is very likely to yield new records, with many of these promising to add to the biogeographic significance of the region.

Mount Diablo in Contra Costa County is a notable peak in California's central Coast Ranges, well known for its biodiversity. To date, no accounts of the bryophytes on this mountain have been published. We present a catalogue of the mosses, liverworts, and hornworts known to occur on Mount Diablo. We base this on collections made by us and augmented by specimens from other collectors that are housed in North American herbaria. We collected extensively on the mountain from 2014 to 2020. Online databases were searched to locate specimens from Mount Diablo. These were located predominantly at the University of California Berkeley (UC) or California Academy of Sciences (CAS). Specimens were examined at these herbaria to confirm their presence and to confirm identifications as needed. We list 160 bryophyte taxa on the mountain, including 137 mosses, 20 liverworts, and three hornworts. Forty families and 75 genera are represented, with Pottiaceae having the most species (39). We list separately 22 taxa that we consider unconfirmed on Mount Diablo because they are represented only by herbarium specimens that we could not locate, or for other reasons as given. Our own collections added 19 bryophyte species (17 mosses and two liverworts) since 2014. We did not find 41 of the confirmed taxa reported on Mount Diablo by others. Thirty-three taxa have so far been collected only once on the mountain. These numbers imply that additional taxa occur there and have not yet been found. We discuss the distribution of taxa within different parts of the mountain, and the Mount Diablo bryophyte flora is briefly compared with that of neighboring regions and of California as a whole.

Napa County, in California's North Coast Range, is well known for its plant diversity. However, until now no one has published a listing of bryophytes for Napa County. I present a catalogue of 158 moss species in 77 genera and 31 families collected and confirmed as occurring within Napa County. The catalogue summarizes 1701 collections (1550 by me). Collection dates encompass 1866 through 2018. I examined selected collections at CAS, UC, and other herbaria, and sent many of my collections to specialists for their identification. I did not collect 11 species reported previously by others. Eighty-six species are collected at only one or two locations. The catalogue includes a summary of the distribution of each species in Napa County and a citation of reference collections deposited in herbaria (CAS, ILL, and UC). In addition to the cited collections, I deposited most of my other Napa County materials at CAS and UC. The number of collections of each species, their number of locations where collection occurred, and whether specimens were collected by me or others is presented. A comparison of the increasing numbers of mosses collected in the Napa County over time with that of nearby areas and California is summarized.

The bryoflora of the Russian Wilderness and adjacent slopes, an area of 112.8 mi² (292 km²), comprises only 1.8% of the land base of Siskiyou County at 6347 mi² (16,439 km²), the fifth largest county in California. Fifty liverworts and 215 mosses (includes four undescribed taxa) are documented by voucher specimens. This represents 33% for both the liverworts and the mosses documented for California. Three species, Lophozia longidens (Lindb.) Macoun, Lophozia obtusa (Lindb.) A.Evans, and Solenostoma schusterianum (J.D.Godfrey & G.Godfrey) Váňa, Hentschel & Heinrichs are reported as new for California. Grimmia brevirostris R.S.Williams is elevated from synonomy with Grimmia hamulosa Lesq., as a species worthy of recognition and represents the first records of this California endemic for the Klamath Ranges.

The moss flora of the Cascade-Siskiyou National Monument, located on the border of southwest Oregon and northwest California, comprises 201 moss species and one variety within 89 genera and 37 families. The majority of the Cascade-Siskiyou National Monument is in Oregon and it comprises less than 0.2 percent of the state; however, roughly 38 percent of moss species known to Oregon were found. Forty species recorded during work for this manuscript are rare or under-collected in Oregon and six are newly reported to the state. Species reported new to Oregon include Grimmia attenuata (Müll.Hal. & Kindb.) Kindb., Meesia longiseta Hedw., Physcomitrella readeri (Müll.Hal.) I.G.Stone & G.A.M.Scott, Pseudocalliergon angustifolium Hedenäs, Schistidium splendens T.T.McIntosh, H.H.Blom, D.R.Toren & Shevock, and Weissia ligulifolia (E.B.Bartram) Grout.

This work is the first in a series of catalogues on the bryophytes of the oldest National Forest of the USA, the Shoshone National Forest. Bordering Yellowstone National Park and being a part of the Greater Yellowstone System, the Forest has retained a wide spectrum of its pristine representative areas, which support a unique bryophyte flora. Based on over 4600 specimens, the catalogue of the bryophytes of the Wyoming's Beartooth Plateau, the northernmost territories of the Forest, has been produced. This bryoflora is composed of 282 species (45 liverworts and 237 mosses) in the study area, representing approximately 53% of the Wyoming bryophyte flora. The richness of the flora is due to the high diversity of habitats, caused by the geological history of this portion of the Central Rocky Mountains, location of the study area essentially in the subalpine and alpine belts, climatic and hydrologic features, and low anthropogenic disturbance. The high elevations and associated habitat conditions allow for many disjunct arctic-alpine species (approximately 25% in the bryophyte flora). Remarkable extensions of upper elevation limits for 72 taxa are registered. Fifteen species, two subspecies, and two varieties of liverworts, as well as 56 species and eight varieties of mosses have not previously been reported for Wyoming in Flora of North America and Synopsis of Liverwort Flora of North America North of Mexico. Thirty-nine taxa (five species of liverworts and 32 species and two varieties of mosses) are of potential conservation concern in Wyoming, including two rare species with Pacific coastal affinities, Philonotis yezoana Besch. & Cardot and Sphagnum miyabeanum Warnst., and one species of extreme northern habitats, Sciuro-hypnum glaciale (Schimp.) Ignatov & Huttunen, being a novelty for continental North America. Brachythecium erythrorrhizon Schimp. var. alpinum Kosovich-Anderson & Ignatov was recently described, using material collected as part of this study.