(Hook.) Aust.
Identity
Unique IDELEMENT_GLOBAL.2.125623
Element CodeNBHEP11010
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryNonvascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumHepatophyta
ClassMarchantiopsida
OrderMarchantiales
FamilyAytoniaceae
GenusCryptomitrium
Concept ReferenceStotler, R. and B. Crandall-Stotler. 1977. A checklist of the liverworts and hornworts of North America. The Bryologist 80(3): 405-428.
Taxonomic CommentsThe name applied to plants in Taiwan, Mannia subpilosa (Horik.) Horik. was determined to be a synonym of Cryptomitrium tenerum (Katagiri and Deguchi 2011, Wang et al. 2011).
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2023-07-27
Change Date2004-04-19
Edition Date2023-07-27
Edition AuthorsNordman, C. (2023).
Threat ImpactMedium
Range Extent>2,500,000 square km (greater than 1,000,000 square miles)
Number of Occurrences81 - 300
Rank ReasonsCryptomitrium tenerum is an amphitropical disjunctive species, which occurs in western North America, Central America, western South America, and Taiwan. It is estimated that there are between 81 and 300 occurrences of Cryptomitrium tenerum rangewide, it is common in California and Central Chile, elsewhere it seems to be rare. It occurs in California on the El Dorado, Los Padres, Sequoia, and Sierra National Forests, Sequoia-Kings Canyon National Park, Yosemite National Park, and Channel Islands National Park, and in Panama at Parque Nacional Volcán Barú.
Range Extent CommentsCryptomitrium tenerum is an amphitropical disjunctive species, which occurs in western North America, Central America, and western South America. In the United States, it occurs in western Washington, western Oregon, and California; in Mexico, it occurs in Baja California, Chihuahua, Jalisco, Morelos, and Mexico states; it also occurs in Panama, central Chile, the province of Salta, Argentina, and Taiwan. The range extent in North and South America was estimated to be 11.6 million square kilometers using herbarium specimens and photo-based observations documented between 1982 and 2023, 140 million square kilometers if Taiwan is also included (Katagiri and Deguchi 2011, Wang et al. 2011, Gradstein 2017, Arrocha et al. 2021, CNABH 2023, GBIF 2023, iNaturalist 2023).
Occurrences CommentsBy applying a 1 km separation distance to herbarium records and photo-based observations documented between 1982 and 2023, it is estimated that there are between 81 and 300 occurrences of Cryptomitrium tenerum rangewide (GBIF 2023, iNaturalist 2023, CNABH 2023).
Threat Impact Comments"Threats include road and recreational trail maintenance, off-road vehicles, fire, logging, and plant succession. Despite its pioneer status on bare disturbed soil, populations of Cryptomitrium are small, discontinuous, and subject to local catastrophic loss. It probably does not compete well with vascular plants. Periodic disturbance is probably necessary to maintain habitat, but extensive or a high frequency of disturbance can extirpate local populations" (Wagner 2018).