''Adiantum jordanii'' is a perennial species of

maidenhair fern ''Adiantum'' (), the maidenhair fern, is a genus of about 250 species of ferns in the subfamily Vittarioideae of the family Pteridaceae, though some researchers place it in its own family, Adiantaceae. The genus name comes from Greek, meaning "un ...

, in the

Vittarioideae Vittarioideae is a subfamily of the fern family Pteridaceae, in the order Polypodiales. The subfamily includes the previous families Adiantaceae (adiantoids or maidenhair ferns) and Vittariaceae (vittarioids or shoestring ferns). Description The ...

subfamily of the

Pteridaceae Pteridaceae is a family of ferns in the order Polypodiales, including some 1150 known species in ca 45 genera (depending on taxonomic opinions), divided over five subfamilies. The family includes four groups of genera that are sometimes recogni ...

. The species is known by the common name California maidenhair. It is native to California and

Baja California Baja California (; 'Lower California'), officially the Free and Sovereign State of Baja California ( es, Estado Libre y Soberano de Baja California), is a state in Mexico. It is the northernmost and westernmost of the 32 federal entities of Mex ...

. ''A. jordanii'' is found in the southernmost part of its range in Baja California with such flora associates as '' Mimulus aridus'' and ''

Daucus pusillus ''Daucus pusillus'' is a species of wild carrot known by the common names American wild carrot and rattle-snake-weed. Its Latin name means "little carrot", or "tiny carrot". It is similar in appearance to other species and subspecies of wild carr ...

''. Each trailing leaf may reach over half a meter in length and is made up of many rounded green segments. Each segment has two to four lobes and it may split between the lobes, the underside of each segment bearing one to four sori. ''Adiantum jordanii'' is a carrier of the fungus-like

oomycete Oomycota forms a distinct phylogenetic lineage of fungus-like eukaryotic microorganisms, called oomycetes (). They are filamentous and heterotrophic, and can reproduce both sexually and asexually. Sexual reproduction of an oospore is the resul ...

, ''

Phytophthora ramorum ''Phytophthora ramorum'' is the oomycete (a type of protist) plant pathogen known to cause the disease sudden oak death (SOD). The disease kills oak and other species of trees and has had devastating effects on the oak populations in California a ...

'', which causes Sudden Oak Death. The USDA enforces an import control, focusing intensely on areas (CA, OR, NY in U.S.) that are infected with Sudden Oak death. When sold, they must be identified by place of origin and must also be accompanied by a

phytosanitary certificate Phytosanitary certification is used to attest that consignments meet phytosanitary (regarding plants) import requirements and is undertaken by an NPPO (National Plant Protection Organisation). A phytosanitary certificate for export or for re-e ...

. The USDA warns to not take cuttings from wild specimens.U.S.D.A. Import Control Notice ''Adiantum jordanii'', from native plant nurseries, is used in

native plant In biogeography, a native species is indigenous to a given region or ecosystem if its presence in that region is the result of only local natural evolution (though often popularised as "with no human intervention") during history. The term is equ ...

and

wildlife garden A wildlife garden (or wild garden) is an environment created by a gardener that serves as a sustainable haven for surrounding wildlife. Wildlife gardens contain a variety of habitats that cater to native and local plants, birds, amphibians, rep ...

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Photo gallery
jordanii Ferns of California Flora of Oregon Garden plants of North America Ferns of the United States Plants described in 1864 {{Pteridaceae-stub

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External links