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Asplenium dimorphum; photograph (c) Sue Carnahan, some rights reserved (CC BY) CC BY(c) Sue Carnahan, some rights reserved (CC BY) · observed growing wild · 2023-03-24

Asplenium dimorphum Kunze

Three-in-one fern

Aspleniaceae · Norfolk Is.

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Asplenium dimorphum, photograph (c) Sue Carnahan, some rights reserved (CC BY)Asplenium dimorphum, photograph (c) Sue Carnahan, some rights reserved (CC BY)Asplenium dimorphum, photograph (c) Sue Carnahan, some rights reserved (CC BY)Asplenium dimorphum, photograph (c) Sue Carnahan, some rights reserved (CC BY)Asplenium dimorphum, photograph (c) Sue Carnahan, some rights reserved (CC BY)Asplenium dimorphum, photograph (c) Sue Carnahan, some rights reserved (CC BY) 16 photographs ›
Habitat figuresfrom few records
Coldest month, mean nightly low
16.1°C
Aug at the habitat, not a floor; extremes not used (sea cell) CHELSA
Warmest month, mean daily high
23°C
Jan, Feb and Mar at the habitat CHELSA
Rain a year (median across the range)
1,234mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
17–44DLI
Lowest to highest month (DLI) CHELSA
The year in your months, northern hemisphere
  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec
Rain spread: 70% of the median year's rain takes 8 months, so no short rainy season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

From few records: 25 records in 4 grid cells. The records.

Summary

Asplenium dimorphum, the Norfolk Island spleenwort, is a species of fern in the family Aspleniaceae, endemic to Norfolk Island.

Quoted from Wikipedia, "Asplenium dimorphum", CC BY-SA 4.0.

About the genus · Asplenium

Asplenium is a genus of about 700 species of ferns, often treated as the only genus in the family Aspleniaceae, though other authors consider Hymenasplenium separate, based on molecular phylogenetic analysis of DNA sequences, a different chromosome count, and structural differences in the rhizomes. The type species for the genus is Asplenium marinum.

Quoted from Wikipedia, "Asplenium", CC BY-SA 4.0.

Cultivation

Seasons

The rain rule reads no short rainy season: 70% of the median year's rain (897 mm of 1,237 mm) takes 8 months, March to September and December. Mean temperature moves 5.6 °C between the warmest and coldest month. Months are the habitat's, southern hemisphere; shifted six months for a northern-hemisphere collection: September to March and June.

Rain

1,237 mm in the median year at the habitat, 897 mm of it March to September and December. Wettest months (2 at 130 mm), driest month October at 71 mm. Across the grid cells of the range the year's total runs 1,195 mm to 1,299 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 1,234 mm, is the year's rain at the top of the page; the 1,237 mm here is the median year's, the twelve monthly medians added, which the rain rule reads. Habitat calendar, southern hemisphere; median year across the grid cells of the range, CHELSA.

Light

Open sky over the habitat: 17 to 44 mol/m²/day across the year (daily light integral, median year across the grid cells of the range, CHELSA).

Warmth and air
Temperature

Monthly means: the coldest month's mean nightly low 16.1 °C in August (across the grid cells of the range 16.0 °C to 16.3 °C), the warmest month's mean daily high 23.0 °C in February (median year across the grid cells of the range, CHELSA). Cold floor: none read. The nearest figure is 16.1 °C, the coldest month's mean nightly low, August, in the median year (CHELSA); a month's mean of its nightly lows is warmer than the nights a floor is read from. The daily extremes were read at a weather cell that is mostly sea and are not used.

Humidity

Relative humidity at the habitat: 57 to 63% across the year (monthly means, median year across the grid cells of the range, CHELSA). A figure about the air, saying nothing about how the plant takes water.

How this section is made

Each card states this species' habitat figures with their sources, and what two fixed rules read from them; nothing here says what the plant does, wants or tolerates. The rules · the terms.

Seasons. Read from the median year of CHELSA monthly rainfall and mean temperature across the grid cells of the range: the rain rule takes the smallest set of months carrying 70% of the rain and calls it winter when its mean is more than half a degree below the year's, summer when more than that above, and neither in between; the temperature rule, used only under 120 mm, names the cooler six months when they are at least a degree cooler than the other six. Months are shifted for the other hemisphere only where the temperature curve moves 4 °C or more and the habitat lies 10° or more from the equator. A reading of the curves, not an observation of the plant.

Rain. CHELSA monthly precipitation, median year across the grid cells of the range. The rain that falls where the species is recorded; nothing about how the plant takes water.

Light. CHELSA shortwave radiation at each envelope cell, a daily-mean flux taken to a daily total and converted at 2.07 mol of PAR per MJ. The sky over the habitat, measured; what reaches a plant under a rock, a shrub or a shade cloth is not.

Temperature. CHELSA monthly means, median year across the grid cells of the range. No cold floor is read without a daily extremes series; the coldest month's mean nightly low named in its sentence is not one. Not a measured survival limit for any plant in a pot.

Humidity. CHELSA relative humidity, median year across the grid cells of the range.

Climate across the habitat

From few records: this habitat climate is read from 25 records in 4 grid cells; a page says so under 12 records or 5 cells, and shows the figures as read.

Habitat months, southern hemisphere

Habitat climate of Asplenium dimorphum through the yearWarmest months January, February and March, mean daily high 23 °C; coldest month August, mean nightly low 16.1 °C; 1,237 mm of rain in the median year (the twelve monthly medians added). Medians across the range, from CHELSA. Habitat months, southern hemisphere.15°20°25°°C · day and nightcold quarter0255075100125150mm rainDLI 17–44RH 57–63%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 4 habitat cells, CHELSA cold quarter: the three months around the coldest month's mean nightly low DLI, mol/m²/dayRH %each on its own scale
Figures by month
JanFebMarAprMayJunJulAugSepOctNovDec
Day °C23 / 22–2323 / 23–2323 / 22–2322 / 21–2220 / 20–2019 / 19–1918 / 18–1818 / 17–1818 / 18–1819 / 19–1920 / 20–2022 / 21–22
Night °C22 / 21–2222 / 22–2222 / 21–2220 / 20–2119 / 19–1918 / 17–1817 / 16–1716 / 16–1617 / 17–1718 / 17–1819 / 19–1920 / 20–21
Rain mm83 / 79–8891 / 87–9795 / 92–101118 / 113–125119 / 115–125130 / 127–136130 / 126–135103 / 100–10795 / 93–9971 / 69–7595 / 92–100107 / 103–113
DLI44 / 43–4440 / 40–4034 / 34–3427 / 27–2721 / 20–2117 / 17–1719 / 18–1924 / 24–2532 / 32–3239 / 38–3943 / 42–4344 / 44–44
RH %63 / 61–6462 / 61–6361 / 60–6260 / 59–6158 / 57–5958 / 57–5857 / 56–5857 / 56–5758 / 57–5959 / 58–5960 / 59–6062 / 61–63

The daily extremes were read at a NASA POWER cell that is 0% land: neither it nor the next candidates whose coldest month's mean nightly low is within 2 °C of the median across cells sit in a POWER cell that is mostly land, and the rule reads a cold floor only from a cell that is mostly land, so none is read for this species. Nor is the coldest month's mean nightly low taken as one: it is a mean of a month's lows, not its coldest night. What that cell gave over 44 years: absolute minimum 13.1 °C, 1st-percentile night 15.2 °C, 99th-percentile day 24.5 °C.

How this section is made
Each figure is the median across the 4 grid cells holding the 25 in-range records, with the 10th–90th percentile span across those cells after the slash where it differs. A dash is a month one or more of those cells has no figure for in the grid (a variable CHELSA does not carry there), so no median is taken rather than one over fewer cells. Extremes and elevation were read at a typical spot in the range, cell 2380:6959 (-29.025, 167.975). Normals: CHELSA V2.1 1981–2010 climatology, 0.05° cells (each the mean of ~36 1 km pixels). Across the range: median and 10th–90th percentile of each month across the 4 distinct grid cells holding 25 of the 25 in-range records; extremes and elevation at the typical cell 2380:6959 (its coldest month's mean nightly low nearest the median across cells, though its NASA POWER cell is only 0% land and none of the 3 next candidates within 2 °C of the median was mostly land); its position is the cell centre. Extremes: NASA POWER (MERRA-2) daily 1981–2024, cell -29.00_168.125, lapse-corrected +70 m at 6.5 °C/km. Elevation: ETOPO 2022, 71 m (cell mean).

Natural habitat

Native range as published by WCVP; the marker is where the records are densest and decides nothing: the climate was read across the cells of the in-range records placed well enough to read one, not at the marker.
Openly licensed records inside the range, framed on where they fall.
NativeNorfolk Is. · regions are the level-3 units of the World Geographical Scheme for Recording Plant Distributions, as Kew's World Checklist records ranges, some under historical names such as Yugoslavia or Czechoslovakia (how).
Map marker-29.016, 167.947 · in the densest population, 33 records (100% of those in range)
Evidence usedThe map marker rests on all 33 georeferenced records inside the native range; the climate across the range on the 25 of them placed to within 10 km; the map shows only the 25 openly licensed ones, which alone would put the marker in the same place. 8 records outside the WCVP native range not used. 8 in-range records are placed to worse than 10 km, or with no stated accuracy (admitted only as a person's observation to three decimals), and stay on the map but off the climate.
How this section is made
The map marker: the openly licensed record nearest the middle of the densest 1° population of the 33 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Asplenium dimorphum, photograph 1did not loadAsplenium dimorphum, photograph 2did not loadAsplenium dimorphum, photograph 3did not loadAsplenium dimorphum, photograph 4did not loadAsplenium dimorphum, photograph 5did not loadAsplenium dimorphum, photograph 6did not load

Photographs: (c) Sue Carnahan, some rights reserved (CC BY) (6).

Similar habitat climate The 6 nearest by mean daily high, mean nightly low and rain, month by month. How.

Coprosma baueri Coprosma baueri Rubiaceae Photo: Public domain, StickpenHibiscus insularis Hibiscus insularis Phillip Island hibiscus Photo: CC BY, naturewatchwidowAraucaria heterophylla Araucaria heterophylla Norfolk Island pine Photo: CC BY, naturewatchwidowSphaeropteris excelsa Sphaeropteris excelsa Norfolk tree fern Photo: CC0, author not statedAlyxia gynopogon Alyxia gynopogon Apocynaceae Photo: CC BY-SA, bushmanjimRhopalostylis baueri Rhopalostylis baueri Kermadec Five Finger Photo: CC0, author not stated

Other Asplenium 84 in the reference

Asplenium actiniopteroides Aspleniaceae Asplenium adiantum-nigrum Asplenium adiantum-nigrum Black spleenwort Photo: CC BY, Nick ButcherAsplenium adulterinum Asplenium adulterinum Corrupt spleenwort Photo: CC BY, Daniel BuczkiewiczAsplenium aethiopicum Asplenium aethiopicum Egyptian spleenwort Photo: CC BY, Em Lamond Asplenium africanum Aspleniaceae Asplenium antiquum Asplenium antiquum Bird’s-nest fern Photo: CC BY, Cheng-Te HsuAsplenium appendiculatum Asplenium appendiculatum Aspleniaceae Photo: CC BY, avocatAsplenium aureum Asplenium aureum Golden Rustyback Fern Photo: CC BY, Mikel Etxeberria OkarizAsplenium australasicum Asplenium australasicum Bird's-nest fern Photo: CC0, author not statedAsplenium bulbiferum Asplenium bulbiferum Hen-and-chickens Photo: CC BY, 大澤風季 ohsawa_FukiAsplenium ceterach Asplenium ceterach Rustyback Photo: CC0, author not statedAsplenium cristatum Asplenium cristatum Parsley spleenwort Photo: CC BY, Liliana Ramírez-Freire all 85 ›

Names & registers

Also known as Asplenium diversifolium; Darea heterophylla. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Aspleniaceae
Described by
Kunze
Native to
Norfolk Is.
Wild records
33 in range · 25 open

Every figure here is derived from public data by a stated rule and names its source; nothing about this species is written for its page by a person or by AI, apart from the marked, credited quotations. How →

Where this page came from built 2026-10-21
GBIF species record gbif.species answeredasked 2026-10-21
GBIF synonyms gbif.synonyms answeredasked 2026-10-21
GBIF common names gbif.vernacular answeredasked 2026-10-21names fetched 2026-10-21
WCVP native range wcvp.distribution answeredas of 2026-06-04
GBIF occurrence records gbif.occurrences answeredas of 2026-10-21GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21; 23 records within 1 km of a botanic garden, herbarium or zoo left out (22 at a botanic garden or arboretum, 1 at a zoo; Wikidata's list)
Habitat climate climate answeredasked 2026-10-21
Daily extremes (NASA POWER) climate.extremes answeredasked 2026-10-21NASA POWER (MERRA-2) daily 1981–2024, cell -29.00_168.125, lapse-corrected +70 m at 6.5 °C/km; read, and set aside: NASA POWER's cell is mostly sea (0% land), so no cold floor is shown
Wikidata wikidata answeredasked 2026-10-21
Wikipedia wikipedia answeredasked 2026-10-21
iNaturalist photographs, wild inat.photos.wild answeredasked 2026-10-22from iNaturalist's open data of 2026-09-27: research-grade observations with an open-licence photograph, the 24 whose photographs iNaturalist received last (the open data holds no votes); filled 2026-10-22
iNaturalist photographs, cultivated inat.photos.cultivated not asked
GBIF media gbif.media answeredasked 2026-10-21none of the photographs on this page is credited to GBIF: those shown are other sources', and GBIF's were the same photographs or were set aside by the photograph rules
OpenAlex papers openalex not askednot yet asked for this reference; a later fill takes the papers from OpenAlex's snapshot

Every source is recorded as having answered, reported nothing, refused, failed, not been asked, or answered twice where one answer is taken (“not taken: two items answered”), and, for a source asked when this page was built, when: the figures are as the source held them that day; a source read from a file (Kew's World Checklist, a GBIF download) says "as of" the file's day instead; a row carried from an earlier build of the page names that build instead. Only “nothing to report” is ever shown as an absence. Records came from 11 datasets via GBIF.org; each carries its own licence.

Cultifolio

Opening your plants…