# Bryophyte flora of Central America
[Central America](https://www.edgepedia.org/central-america), taken here as the seven countries from [Guatemala](https://www.edgepedia.org/guatemala) to Panama plus [Costa Rica](https://www.edgepedia.org/costa-rica)'s Cocos Island, supports mosses, liverworts, and hornworts in a rich bryophyte flora[1](http://www.mobot.org/MOBOT/Moss/centralamerica/welcome.shtml). The region holds 968 moss species in the completed four-part Moss Flora of Central America[2](https://www.mbgpress.org/product-p/9781935641148.htm) and, per the first complete liverwort and hornwort catalog, 846 liverwort species in 126 genera and 19 hornwort species in 7 genera and 4 families[3](https://doi.org/10.5479/si.28400228). The isthmus spans an area three-fourths the size of Texas, and earlier project accounts credited the region with 871 moss species, roughly the same number of mosses as Colombia, a country nearly twice as large[1](http://www.mobot.org/MOBOT/Moss/centralamerica/welcome.shtml). This richness reflects two conditions: great vertical relief, which packs a broad range of habitats into a small area, and physical closeness to three species-source areas, South America, North America, and the Caribbean[1](http://www.mobot.org/MOBOT/Moss/centralamerica/welcome.shtml).
| Fact | Figure | Source |
|---|---|---|
| Moss species (four-part flora) | 968 | [2](https://www.mbgpress.org/product-p/9781935641148.htm) |
| Liverwort species (first complete catalog) | 846 in 126 genera | [3](https://doi.org/10.5479/si.28400228) |
| Hornwort species | 19 in 7 genera, 4 families | [3](https://doi.org/10.5479/si.28400228) |
| Endemism, mosses (Part 1 sample) | 10% (20 of 203 species) | [4](http://www.mobot.org/MOBOT/Moss/centralamerica/introduction.pdf) |
| Endemism, Costa Rica–Panama–Colombia–Venezuela unit | 17.3% (259 of 1,501 species) | [5](https://doi.org/10.17129/botsci.1595) |
| Costa Rica hepatics and hornworts | 582 + 8 species | [6](https://www.biotaxa.org/dbe/article/view/bde.26.1.17) |
| Panama liverworts and hornworts | 289 taxa (checklist); close to 470 (later study) | [7](https://www.biotaxa.org/dbe/article/view/bde.15.1.14), [8](https://www.biotaxa.org/Phytotaxa/article/view/phytotaxa.172.3.3) |
| New country/region records in Smithsonian catalog | 184 | [3](https://doi.org/10.5479/si.28400228) |
## Diversity and taxonomic composition
The completed moss flora documents 968 species across four volumes; the final volume alone provides keys and descriptions for 208 of them[2](https://www.mbgpress.org/product-p/9781935641148.htm). Part 2 treats 286 species and contains the flora's major generic treatments: Macromitrium with 31 species, Bryum with 27, Brachymenium with 16, Leptodontium with 14, and Breutelia with 14[9](https://www.mbgpress.org/product-p/msb-90.htm).
Liverwort composition differs sharply by habitat. On Barro Colorado Island, a lowland site in Panama, 85 liverwort species in 37 genera and 12 families occur alongside one hornwort; the family Lejeuneaceae accounts for 67 species, about 80% of the island's liverworts, and roughly 40% of all its bryophytes[10](https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/bryologie2022v43a9.pdf).
## Country checklists and survey status
Survey effort is very uneven across the seven countries.
**Costa Rica** has seen prolific bryological production, together with Panama[11](https://frahmia.de/downloads/frahmia/frahmia_0041.pdf). Its hepatic and hornwort catalog reports 582 hepatic and eight hornwort species, adding 26 new records and excluding 49 dubious ones[6](https://www.biotaxa.org/dbe/article/view/bde.26.1.17). A 1974 baseline already credited the country with 542 moss species and varieties, then probably the richest moss flora of any Central American country south of Mexico[12](https://doi.org/10.2307/3241552).
**Panama** moved from 289 liverwort and hornwort taxa in its annotated checklist, including 93 new for the country and the first four hornwort taxa reported[7](https://www.biotaxa.org/dbe/article/view/bde.15.1.14), to a total described as close to 470 liverwort and hornwort species after a study that newly reported 107 species, two subspecies, and one variety, with 27 previously unknown from Central America and 328 new province records[8](https://www.biotaxa.org/Phytotaxa/article/view/phytotaxa.172.3.3).
**Belize** has a moss checklist of 250 species and 13 varieties, built from literature, revisions, and recent collections[13](https://www.biotaxa.org/dbe/article/view/bde.15.1.9).
**El Salvador** now has 264 moss species after fieldwork at 11 localities yielded 116 specimens, 69 identified species, and 26 national additions[14](https://www.biotaxa.org/dbe/article/view/bde.34.1.1); its 2024 preliminary liverwort checklist includes 18 families, 34 genera, and 104 species, with no hornwort known from the country and four species considered dubious[11](https://frahmia.de/downloads/frahmia/frahmia_0041.pdf). Winkler (1967) had reported 60 epiphyllous liverwort species from the country, six new to science, so the true liverwort count likely exceeds 104[11](https://frahmia.de/downloads/frahmia/frahmia_0041.pdf).
**Guatemala, Honduras and Nicaragua**: historical counts are 519 moss species for Guatemala (Bartram 1949), 126 for Honduras, and 110 for [Nicaragua](https://www.edgepedia.org/nicaragua) (Crosby and Crum 1967), and 213 for Panama (Crosby 1969b)[12](https://doi.org/10.2307/3241552).
The imbalance has a documented social cause. Research comparing scientific output found a marked gap between the low production of the northern countries (Guatemala, [El Salvador](https://www.edgepedia.org/el-salvador), Honduras, Nicaragua), and the prolific production of Costa Rica and Panama, and linked this to democratic stability[11](https://frahmia.de/downloads/frahmia/frahmia_0041.pdf). El Salvador's bryoflora had not been studied in the 20 years before the recent survey[14](https://www.biotaxa.org/dbe/article/view/bde.34.1.1), and sparse collecting generally reflects a predominant lowland topography and the few bryologists working in Central American countries[15](https://doi.org/10.22201/ib.9786070271854e2015).
## Habitats and elevation gradients
Bryophyte assemblages change substantially with elevation.
**Darién, Panama.** On Cerro Pirre (1200 m), species richness peaks in submontane forest, while montane forest holds the most exclusive species and the largest bryophyte biomass; the study added 40 hepatic species new to Panama[16](https://www.biotaxa.org/dbe/article/view/bde.5.1.10).
**Talamanca oak forests, Costa Rica.** A complete inventory of six hectares of upper montane Quercus forest yielded 206 species: 100 mosses, 105 hepatics, and one hornwort[17](https://doi.org/10.1639/0007-2745(2002)105[0334:bdmdad]2.0.co;2). Forest floor habitats contribute a much higher share of species richness here than in lower-elevation forests, with microhabitats grouping into forest floor, phyllosphere, and epiphytic assemblages[17](https://doi.org/10.1639/0007-2745(2002)105[0334:bdmdad]2.0.co;2). Across the wider Talamanca study of oak forests and páramo, 401 species were recorded (191 hepatics, one hornwort, 209 mosses), of which 251 occur in oak forests[18](https://www.kiphub.com/paper/61e5095ed59199bc49f636c0).
**Cloud forests.** At Monteverde Cloud Forest Preserve and adjacent pastureland, a survey found 198 epiphytic bryophyte taxa (120 hepatics, 77 mosses, one hornwort), distributed as 178 in primary forest, 63 in secondary forest, and 84 in pastureland[19](https://www.biotaxa.org/dbe/article/view/bde.20.1.10). At Nectandra Cloud Forest Reserve on the Atlantic premontane slope, an understory survey produced 1,083 specimens across 55 families, with 74 genera of mosses, 75 genera of liverworts, and 3 of hornworts, distributed over six substrate types: corticolous, epiphyllous, saxicolous, terricolous, aquatic, and lignicolous[20](https://doi.org/10.3897/bdj.5.e11778).
**Lowland pastures.** In Chiriquí, Panama, lowland pastures and secondary forests are highlighted as under-sampled habitats with high potential for bryophyte conservation[21](https://www.lillo.org.ar/journals/index.php/lilloa/article/download/2407/2198/25942).
## Endemism and biogeography
Moss endemism in Central America is low. Only 10% (20 of 203) of the species treated in Part 1 of the Moss Flora are endemic to the region[4](http://www.mobot.org/MOBOT/Moss/centralamerica/introduction.pdf). The flora is described as eclectic rather than endemic, assembled from three neighboring source areas plus species shared with Africa and Southeast Asia[2](https://www.mbgpress.org/product-p/9781935641148.htm).
The isthmus functions as a meeting point of two continental floras: Laurasian North America with a strong Hypnobryalean component and Gondwanan South America with a strong Isobryalean component[4](http://www.mobot.org/MOBOT/Moss/centralamerica/introduction.pdf). Most Central American mosses belong to a northern neotropical flora extending from southern Mexico through Central America, Colombia, Venezuela, the Guianas, Ecuador, and parts of Peru and Brazil[4](http://www.mobot.org/MOBOT/Moss/centralamerica/introduction.pdf). In the Talamanca forests, 93% of forest bryophyte species have tropical distributions, the neotropical element includes almost 74% of species, and 27% have Andean-centered ranges, indicating a direct highland connection to South America[18](https://www.kiphub.com/paper/61e5095ed59199bc49f636c0).
## By the numbers and regional comparison
The same 1,501-species unit of Costa Rica, Panama, Colombia, and Venezuela carries 259 endemics (17.3%), while Mexico–Guatemala holds 1,061 species with 93 endemics (8.8%) and the whole Neotropics 3,869 species with 1,729 endemics (44.7%); endemism values are highest in Mexico and the Andean countries[5](https://doi.org/10.17129/botsci.1595). Mexico and Guatemala form one floristic unit, since 84% of Guatemalan mosses are represented in the Mexican flora[5](https://doi.org/10.17129/botsci.1595).
Earlier project accounts credited Central America, in an area three-fourths the size of Texas, with 871 moss species, roughly the same number of mosses as Colombia, a country nearly twice as large[1](http://www.mobot.org/MOBOT/Moss/centralamerica/welcome.shtml); the completed flora covers 968 species[2](https://www.mbgpress.org/product-p/9781935641148.htm), while regional endemism is low (10% in the Part 1 sample[4](http://www.mobot.org/MOBOT/Moss/centralamerica/introduction.pdf)). The flora is eclectic rather than endemic, produced by the pronounced vertical relief of the region and its close physical position to three species-source areas: South America, North America, and the Caribbean[2](https://www.mbgpress.org/product-p/9781935641148.htm).
## References
1. [Moss Flora of Central America (Missouri Botanical Garden project page)](http://www.mobot.org/MOBOT/Moss/centralamerica/welcome.shtml)
2. [Moss Flora of Central America, Part 4: Fabroniaceae–Polytrichaceae](https://www.mbgpress.org/product-p/9781935641148.htm)
3. [Catalog of Liverworts (Marchantiophyta) and Hornworts (Anthocerotophyta) from Central America and Cocos Island](https://doi.org/10.5479/si.28400228)
4. [Moss Flora of Central America – Introduction](http://www.mobot.org/MOBOT/Moss/centralamerica/introduction.pdf)
5. [Distribución geográfica y diversidad de los musgos neotropicales](https://doi.org/10.17129/botsci.1595)
6. [Catalogue of Costa Rican Hepaticae and Anthocerotae](https://www.biotaxa.org/dbe/article/view/bde.26.1.17)
7. [A Checklist of the Hepatics and Anthocerotes of Panamá](https://www.biotaxa.org/dbe/article/view/bde.15.1.14)
8. [Towards a more complete knowledge of the liverwort flora of Panama](https://www.biotaxa.org/Phytotaxa/article/view/phytotaxa.172.3.3)
9. [Moss Flora of Central America, Part 2: Encalyptaceae–Orthotrichaceae](https://www.mbgpress.org/product-p/msb-90.htm)
10. [Liverworts and hornworts of Barro Colorado Island, Panama](https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/bryologie2022v43a9.pdf)
11. [Preliminary checklist for the liverworts and hornworts of El Salvador](https://frahmia.de/downloads/frahmia/frahmia_0041.pdf)
12. [The Mosses Reported from Costa Rica (Bowers 1974)](https://doi.org/10.2307/3241552)
13. [A Checklist of the Mosses of Belize](https://www.biotaxa.org/dbe/article/view/bde.15.1.9)
14. [Bryoflora Salvadorensis. I. Contributions to the moss flora of El Salvador](https://www.biotaxa.org/dbe/article/view/bde.34.1.1)
15. [Grimmia (Grimmiaceae, Bryophyta) in the Neotropics](https://doi.org/10.22201/ib.9786070271854e2015)
16. [Bryophyte diversity along an altitudinal gradient in Darién National Park, Panama](https://www.biotaxa.org/dbe/article/view/bde.5.1.10)
17. [Bryophyte Diversity, Microhabitat Differentiation, and Distribution of Life Forms in Costa Rican Upper Montane Quercus Forest](https://doi.org/10.1639/0007-2745(2002)105[0334:bdmdad]2.0.co;2)
18. [Phytogeography of the bryophyte floras of oak forests and páramo of the Cordillera de Talamanca, Costa Rica](https://www.kiphub.com/paper/61e5095ed59199bc49f636c0)
19. [Epiphytic bryophytes of Monteverde, Costa Rica](https://www.biotaxa.org/dbe/article/view/bde.20.1.10)
20. [On the diversity and richness of understory bryophytes at Nectandra Cloud Forest Reserve, Costa Rica](https://doi.org/10.3897/bdj.5.e11778)
21. [Nuevos registros nacionales y regionales de briófitos en tierras bajas de Chiriquí (Panamá)](https://www.lillo.org.ar/journals/index.php/lilloa/article/download/2407/2198/25942)
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*Topic: Encyclopedia › Life and health › Plants and algae › Mosses and other bryophytes › Regional bryophyte floras › North American bryophyte floras › Central American and Caribbean bryophyte floras*
*Initially written Sep 17, 2026 · Edited: Oct 11, 2026; Oct 15, 2026; Oct 21, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license