''Cibotium menziesii'', the ''hāpuu ii'' or Hawaiian tree fern, is a species of

tree fern The tree ferns are arborescent (tree-like) ferns that grow with a trunk elevating the fronds above ground level, making them trees. Many extant tree ferns are members of the order Cyatheales, to which belong the families Cyatheaceae (scaly tree ...

that is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to the islands of

Hawaii Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only stat ...

. It is named after the Scottish naturalist

Archibald Menzies Archibald Menzies ( ; 15 March 1754 – 15 February 1842) was a Scottish surgeon, botanist and naturalist. He spent many years at sea, serving with the Royal Navy, private merchants, and the Vancouver Expedition. He was the first recorded Euro ...

. It is also known as the male tree fern, and ''

Cibotium glaucum ''Cibotium'' (from Greek , ''kibṓtion'', "little chest" or "box"), also known as manfern, is a genus of 11 species of tropical tree ferns. It is the only genus in family Cibotiaceae in the Pteridophyte Phylogeny Group classification of 2016 ( ...

'' is deemed the female tree fern due to differences in color.

Biology

''Hāpuu ii'' can grow up to tall but are usually in height with a diameter of nearly , making it Hawaii's largest tree fern. The trunk is made of stiff hard fibres surrounding a

starch Starch or amylum is a polymeric carbohydrate consisting of numerous glucose units joined by glycosidic bonds. This polysaccharide is produced by most green plants for energy storage. Worldwide, it is the most common carbohydrate in human diets ...

pith Pith, or medulla, is a tissue in the stem Stem or STEM may refer to: Plant structures * Plant stem, a plant's aboveground axis, made of vascular tissue, off which leaves and flowers hang * Stipe (botany), a stalk to support some other ...

in the centre. The green fronds have yellow midribs and are paler on the underside. They grow to as long as . Stems are covered in red or black bristles. The fronds are singularly divided but divide at the end where the spores form.

Reproduction

This species reproduces through the use of

spore In biology, a spore is a unit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores form part of the life cycles of many plants, algae, f ...

s, which form at and are released from the end of the fronds. For domestic and commercial reproduction, spores are collected from the lower fronds of the plant, which are heated, treated with water and kept refrigerated. The side shoots off the main trunk are also viable but need to be cut close to the trunk.

Habitat

''Cibotium menziesii'' is

to the

windward Windward () and leeward () are terms used to describe the direction of the wind. Windward is ''upwind'' from the point of reference, i.e. towards the direction from which the wind is coming; leeward is ''downwind'' from the point of reference ...

portions of the main

Hawaiian islands The Hawaiian Islands ( haw, Nā Mokupuni o Hawai‘i) are an archipelago of eight major islands, several atolls, and numerous smaller islets in the North Pacific Ocean, extending some from the island of Hawaii in the south to northernmost Kur ...

. It is found in

rainforests Rainforests are characterized by a closed and continuous tree canopy, moisture-dependent vegetation, the presence of epiphytes and lianas and the absence of wildfire. Rainforest can be classified as tropical rainforest or temperate rainforest ...

at elevations of . They can grown on the ground or on trees as an

epiphyte An epiphyte is an organism that grows on the surface of a plant and derives its moisture and nutrients from the air, rain, water (in marine environments) or from debris accumulating around it. The plants on which epiphytes grow are called phoroph ...

. Despite its origin, it is very adaptable and can withstand long cool winters; even without fronds, little heat is needed to stimulate new growth. Due to the effects of invasive species, especially

feral A feral () animal or plant is one that lives in the wild but is descended from domesticated individuals. As with an introduced species, the introduction of feral animals or plants to non-native regions may disrupt ecosystems and has, in some ...

pigs The pig (''Sus domesticus''), often called swine, hog, or domestic pig when distinguishing from other members of the genus '' Sus'', is an omnivorous, domesticated, even-toed, hoofed mammal. It is variously considered a subspecies of ''Sus s ...

, and commercial harvesting, populations of this species are currently in decline.

Uses

Food

The

y core of the trunk can be cooked (often stewed) and eaten; it was a staple food during times of

famine A famine is a widespread scarcity of food, caused by several factors including war, natural disasters, crop failure, Demographic trap, population imbalance, widespread poverty, an Financial crisis, economic catastrophe or government policies. Th ...

. This part of the trunk is an important food source for

feral pigs The feral pig is a domestic pig which has gone feral, meaning it lives in the wild. They are found mostly in the Americas and Australia. Razorback and wild hog are Americanisms applied to feral pigs or boar-pig hybrids. Definition A feral pi ...

Medicine

The

of the ''hāpuu ii'' is combined with ''olena'' (''

Curcuma longa Turmeric () is a flowering plant, ''Curcuma longa'' (), of the ginger family, Zingiberaceae, the rhizomes of which are used in cooking. The plant is a perennial, rhizomatous, herbaceous plant native to the Indian subcontinent and Southeast Asi ...

'') roots, ''pawale'' (''

Rumex giganteus The docks and sorrels, genus ''Rumex'', are a genus of about 200 species of annual, biennial, and perennial herbs in the buckwheat family, Polygonaceae. Members of this genus are very common perennial herbs with a native almost worldwide distrib ...

''), and ''

okolehao Okolehao is a Hawaiian alcoholic spirit whose main ingredient was the root of the ti plant. Okolehao's forerunner was a fermented ti root beverage or beer. When distillation techniques were introduced by English seamen in 1790, it was distilled ...

liquor Liquor (or a spirit) is an alcoholic drink produced by distillation of grains, fruits, vegetables, or sugar, that have already gone through alcoholic fermentation. Other terms for liquor include: spirit drink, distilled beverage or hard ...

to create a 'blood purifier'. A treatment for chest pain is prepared from ''hāpuu ii'' and ''amaumau'' (''

Sadleria cyatheoides ''Sadleria cyatheoides'', commonly known as amaumau fern or amau, is a fern species in the family Blechnaceae, in the eupolypods II clade of the order Polypodiales, in the class Polypodiopsida. It is endemic to Hawaii and inhabits lava flows, ope ...

'') piths, ''kukui'' (''

Aleurites moluccana ''Aleurites moluccanus'', the candlenut, is a flowering tree in the spurge family, Euphorbiaceae, also known as candleberry, Indian walnut, ''kemiri'', varnish tree, ''nuez de la India'', ''buah keras'', ''godou'', kukui nut tree, and ''rata ke ...

'') bark, ''ohia ai'' (''

Syzygium malaccense ''Syzygium malaccense'' is a species of flowering tree native to tropical Asia and Australia. It is one of the species cultivated since prehistoric times by the Austronesian peoples. They were carried and introduced deliberately to Remote Ocean ...

'') bark, ''ahakea'' (''

Bobea ''Bobea'' is a genus of flowering plants in the family Rubiaceae. All species in this genus are endemic to Hawaii. ''Bobea'' was named for Jean-Baptiste Bobe-Moreau by Charles Gaudichaud-Beaupré in 1830 in his book ''Voyage de l'Uranie''. The ...

'' spp.) bark, ''uhaloa'' (''

Waltheria indica ''Waltheria indica'' is a species of flowering plant in the mallow family, Malvaceae, that has a pantropical distribution. It is believed to have originated in the Neotropics. Common names include sleepy morning, basora prieta, hierba de soldado ...

'') root bark, ''popolo'' (''

Solanum americanum ''Solanum americanum'', commonly known as American black nightshade, small-flowered nightshade or glossy nightshade, is a herbaceous flowering plant of wide though uncertain native range. The certain native range encompasses the tropics and subtr ...

''), ''aukoi'' (''

Senna occidentalis ''Senna occidentalis'' ndian vernacular name ''Usaya ki Fali''is a pantropical plant species, native to the Americas. The species was formerly placed in the genus '' Cassia''. Vernacular names in English include septicweed, coffee senna, coffee ...

''), ''

noni ''Morinda citrifolia'' is a fruit-bearing tree in the coffee family, Rubiaceae. Its native range extends across Southeast Asia and Australasia, and was spread across the Pacific by Polynesian sailors. The species is now cultivated throughout th ...

'' (''Morinda citrifolia'') fruit, and ''ko kea'' (''

Saccharum officinarum ''Saccharum officinarum'' is a large, strong-growing species of grass in the genus ''Saccharum''. Its stout stalks are rich in sucrose, a simple sugar which accumulates in the stalk internodes. It originated in New Guinea, and is now cultivated ...

''). Heated fibres from the fronds are used to cure numerous bodily ailments such as muscle pain and joint stiffness.

Other uses

The '' pulu'' (frond fibres) are used to absorb bodily fluid from corpses in preparation for traditional burials. These same fibres are also used in handcrafted pillows that are sold as souvenirs on the islands. The trunk was hollowed out by

Native Hawaiians Native Hawaiians (also known as Indigenous Hawaiians, Kānaka Maoli, Aboriginal Hawaiians, First Hawaiians, or simply Hawaiians) ( haw, kānaka, , , and ), are the indigenous ethnic group of Polynesian people of the Hawaiian Islands. Hawaii ...

and used as a planter for ''uhi'' (''

Dioscorea alata ''Dioscorea alata'', also known as purple yam, ube (, ), or greater yam, among many other names, is a species of yam (a tuber). The tubers are usually a vivid violet-purple to bright lavender in color (hence the common name), but some range in ...

''), and this practice continues.

References

External links

''Cibotium Menziesii Pictures''
{{Taxonbar, from=Q2925135 menziesii Endemic flora of Hawaii Native ferns of Hawaii Epiphytes Flora without expected TNC conservation status