Taxonomy
Red List Status -
Endangered (EN) , assessed in 28/11/2018
Hymenophyllum soriemersum is an endemic epyphitic fern on tree's trunck from New Caledonia, which is only known from two summits in the center and northeastern mountain range of Grande Terre. It occurs in high altitude shrubland soil from 1,380 and 1,550 m asl. Known from two localities, its extent of occurrence (EOO) and area of occupancy (AOO) are respectively estimated to 12 and 8 km². The main threat is posed by invasive species (feral pigs (Sus scrofa) and rusa deer (Rusa timorensis)), causing habitat degradation. Therefore, H. soriemersum is listed as Endangered (EN) under criteria B1ab(iii)+2ab(iii) with a decline of the quality of habitat.
Geographical area
Hymenophyllum soriemersum is endemic to New Caledonia where it is only known from two summits in the center and northeastern mountain range of Grande Terre: Mé Maoya and Mont Panié.
Population
Population size is unknown.
Habitat
Hymenophyllum soriemersum is an epiphytic fern on tree's trunk endemic of New Caledonia, which occurs in dense humid forest from 1,380 to 1,550 m asl.
Threats
The main threats identified are invasive species (Rusa deer (Rusa timorensis) and feral pigs (Sus scrofa)) which contribute to the decline of habitat quality.
Conservation
Hymenophyllum soriemersum is not protected by legislation in New Caledonia but it does occur in one protected area: Mont Panié. Prospection on Mt. Panié and Mé Maoya is needed to collect more biological material and better estimate its population size and search that species in other northeastern massifs.
Bibliography
Munzinger J., Morat Ph., Jaffré T., Gâteblé G., Pillon Y., Rouhan G., Bruy, D., Veillon J.-M., & M. Chalopin. 2019. FLORICAL: Checklist of the vascular indigenous flora of New Caledonia..
Del Rio, A. & al. 2017. Origins of the fern genus Hymenophyllum (Hymenophyllaceae) in New Caledonia: Multiple independent colonizations from surrounding territories and limited in situ diversification. Taxon(66(5)) , p.1041-1064.
Ebihara A.,Iwatsuki K., Ito M., Hennequin S., Dubuisson J.Y. 2007. A global molecular phylogeny of the fern genus Trichomanes (Hymenophyllaceae) with special reference to stem anatomy. Botanical Journal of the Linnean Society,(155(1)) , p.1-27.
Endemia.nc 2016. Faune et Flore de Nouvelle-Calédonie.
Ebihara A., Dubuisson J.-Y., Iwatsuki K., Hennequin S., Ito M. 2006. A taxonomic revision of Hymenophyllaceae. Blumea(51(2)) , p.221-280.
Experts
Assessor(s): Amice, R., Butin, J., Garnier, D., Veillon, J., Fleurot, D., Laudereau, C., Suprin, B., Mandaoué, L.
Reviewer(s): Tanguy, V.
Contributor(s): Perrie, L., Field, A., Rouhan, G.
Facilitator(s): Meyer, S., Warimavute, G.