Diplazium is a genus of ferns that specifically includes the approximately 400 known species of twinsorus ferns. The Greek root is diplazein meaning double: the indusia in this genus lie on both sides of the vein. These ferns were earlier considered part of either the Athyriaceae, Dryopteridaceae,[3] Aspleniaceae, or Polypodiaceae families or recognized as belonging to their own taxonomic family. The Pteridophyte Phylogeny Group classification of 2016 (PPG I) places the genus in the Athyriaceae.[1] The taxonomy of the genus is difficult and poorly known, and by 2009 has never been the subject of a complete monographic study.[4] Their distribution is pantropical, with a few species extending into temperate areas.[3][5]
The rhizome of the genus Diplazium varies from creeping to erect, and is scaly. Its fronds are deciduous or evergreen, are trophopodic[nb 1] and are either monomorphic or weakly dimorphic. The stipe is green, deeply grooved from above, and is either scaly or glabrous. It always has two lunate vascular bundles. The blades are either singular or in sets of two and are entirely pinnate, range from oblong-lanceolate to deltate, and from herbaceous to papery. It has linear basal sori that are paired back-to-back on the same vein. The indusium is linear and persistent, and the sporangia are brownish.
Some common species include Diplazium hymenodes, the peacock fern; Diplazium esculentum, the vegetable fern; Diplazium molokaiense, the Molokai twinsorus fern; and Diplazium lonchophyllum, the lance-leaved glade fern.
^ abPPG I (2016), "A community-derived classification for extant lycophytes and ferns", Journal of Systematics and Evolution, 54 (6): 563–603, doi:10.1111/jse.12229, S2CID 39980610
^Diplazium Sw. Plants of the World Online. Retrieved 31 August 2023.
^ ab"3. Diplazium Swartz", Flora of North America
^Leticia Pacheco and Robbin C. Moran. Lectotypification of Several Names Currently Placed in Diplazium (Woodsiaceae). American Fern Journal, Vol. 93, No. 2 (Apr. - Jun., 2003), pp. 90-92
^"Diplazium esculentum". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture. Retrieved 12 January 2018.
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Diplazium laffanianum, or Governor Laffan's fern, is a species of fern endemic to Bermuda. It is listed as extinct in the wild. It is named after Sir...
Diplazium esculentum, the vegetable fern, is an edible fern found throughout Asia and Oceania. It is probably one of the most commonly consumed fern....
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Minangkabau ethnic group of Indonesia. In the Philippines, young fronds of Diplazium esculentum or pakô is a delicacy often made into a salad with tomato,...
struthiopteris (ostrich fern), and Osmundastrum cinnamomeum (cinnamon fern). Diplazium esculentum is also used in the tropics (for example in budu pakis, a traditional...
celery or spearmint. Yam phak khut ยำผักกูด A salad of edible fern shoots (Diplazium esculentum) and pork. Yam pla duk fu ยำปลาดุกฟู "Exploded" catfish salad...
(tracheophytes). There is only one species of fern listed as Extinct in the Wild: Diplazium laffanianum, Governor Laffan's fern There are 5 species of cycad listed...
Trophopod (the persistent petiole base of several fern genera) – e.g. Diplazium, Onoclea sensibilis Others: Storage hypocotyl (the stem of a seedling)...
of ferns in the family Diplaziopsidaceae. The genus name means 'like Diplazium'. As of January 2020[update], the Checklist of Ferns and Lycophytes of...
shoots of Begonia sp., shoots of Phrynium sp., shoots of vegetable fern (Diplazium esculentum), and flowers of wild ginger (Etlingera coccinea). Most commonly...
(including Anisocampium and Cornopteris Nakai) Deparia Hook. & Grev. Diplazium Sw. As of November 2019[update], the Checklist of Ferns and Lycophytes...
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