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Pityrogramma chrysophylla; photograph (c) Guillaume Delaitre, some rights reserved (CC BY) CC BY(c) Guillaume Delaitre, some rights reserved (CC BY) · observed growing wild · 2026-08-12

Pityrogramma chrysophylla (Sw.) Link

Island goldback fern; Golden fern

Pteridaceae · Haiti, Leeward Is. AB Ant +3

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Pityrogramma chrysophylla, photograph (c) Guillaume Delaitre, some rights reserved (CC BY)Pityrogramma chrysophylla, photograph author not stated, no rights reservedPityrogramma chrysophylla, photograph author not stated, no rights reservedPityrogramma chrysophylla, photograph (c) Matteo Bellucci, some rights reserved (CC BY)Pityrogramma chrysophylla, photograph (c) eml23, some rights reserved (CC BY)Pityrogramma chrysophylla, photograph (c) Cy Stavros, some rights reserved (CC BY) 44 photographs ›
Habitat figures
Coldest month, mean nightly low
23.3°C
Feb at the habitat, not a floor; extremes not used (sea cell) CHELSA
Warmest month, mean daily high
28°C
Jul, Aug and Sep at the habitat CHELSA
Rain a year (median across the range)
1,787mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
30–43DLI
Lowest to highest month (DLI) CHELSA
The year in the habitat's months, not shifted
  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec
A sharp rainy season, May to November (the habitat's months, not shifted), in a year of even temperature. rain rule, CHELSA
Not shifted: the shift rule does not apply to this habitat. The chart is in the habitat's months.

Cultivation

Seasons

The rain rule reads a sharp season: 70% of the median year's rain (1,315 mm of 1,821 mm) falls in May to November. The temperature curve is flat, 2.5 °C between the warmest and coldest month, so the growing-season rule does not infer a growing season from it. Months are the habitat's, northern hemisphere. The temperature curve moves under 4 °C between the warmest and coldest month, where the shift rule does not apply, so they are not shifted for a collection elsewhere.

Rain

1,821 mm in the median year at the habitat, 1,315 mm of it May to November. Wettest month September at 223 mm, driest month February at 75 mm. Across the grid cells of the range the year's total runs 1,258 mm to 2,574 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 1,787 mm, is the year's rain at the top of the page; the 1,821 mm here is the median year's, the twelve monthly medians added, which the rain rule reads. Habitat calendar, northern hemisphere; median year across the grid cells of the range, CHELSA.

Light

Open sky over the habitat: 30 to 43 mol/m²/day across the year (daily light integral, median year across the grid cells of the range, CHELSA; the lowest 10th-percentile month across the cells is 28, the highest 90th-percentile month 43).

Warmth and air
Temperature

Monthly means: the coldest month's mean nightly low 23.3 °C in February (across the grid cells of the range 20.8 °C to 23.9 °C), the warmest month's mean daily high 27.8 °C in August and September (median year across the grid cells of the range, CHELSA). Cold floor: none read. The nearest figure is 23.3 °C, the coldest month's mean nightly low, February, 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: 63 to 67% 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

Habitat months, northern hemisphere

Habitat climate of Pityrogramma chrysophylla through the yearWarmest months July, August and September, mean daily high 28 °C; coldest month February, mean nightly low 23.3 °C; 1,821 mm of rain in the median year (the twelve monthly medians added). Medians across the range, from CHELSA. Habitat months, northern hemisphere.15°20°25°30°35°°C · day and nightcold quarter0100200300400mm rainDLI 30–43RH 63–67%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 22 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 °C25 / 23–2725 / 23–2725 / 24–2726 / 24–2827 / 25–2827 / 26–2928 / 26–3028 / 26–3028 / 26–2927 / 25–2927 / 25–2826 / 24–27
Night °C24 / 21–2423 / 21–2423 / 21–2424 / 22–2525 / 23–2525 / 23–2625 / 23–2625 / 23–2626 / 23–2625 / 23–2625 / 22–2524 / 22–25
Rain mm104 / 72–15075 / 52–10476 / 46–97111 / 79–143151 / 111–212143 / 77–220170 / 97–282206 / 111–299223 / 150–306216 / 159–279206 / 169–313140 / 99–208
DLI32 / 30–3436 / 34–3741 / 39–4243 / 42–4342 / 41–4342 / 40–4342 / 40–4241 / 39–4138 / 36–3934 / 33–3531 / 30–3330 / 28–32
RH %64 / 61–6963 / 60–6963 / 60–6964 / 61–7165 / 62–7266 / 62–7266 / 63–7367 / 63–7366 / 64–7367 / 64–7366 / 63–7364 / 61–70

The daily extremes were read at a NASA POWER cell that is 24% 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 21.6 °C, 1st-percentile night 22.9 °C, 99th-percentile day 29.3 °C.

How this section is made
Each figure is the median across the 22 grid cells on land that hold in-range records (59 records in those cells; 2 more cells hold records but no land by the elevation layer, so those records sit at sea and the cells are left out), 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 1488:2372 (15.575, -61.375). 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 22 distinct grid cells holding 59 of the 61 in-range records (2 further cells with records at sea, by the elevation layer, left out); extremes and elevation at the typical cell 1488:2372 (its coldest month's mean nightly low nearest the median across cells, though its NASA POWER cell is only 24% land and none of the 11 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 15.50_-61.250, lapse-corrected +78 m at 6.5 °C/km. Elevation: ETOPO 2022, 135 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.
NativeHaiti, Leeward Is. AB Ant, Puerto Rico, Windward Is., Venezuela · introduced: Azores, Lesser Sunda Is., Samoa, Tonga · 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 marker15.593, -61.379 · in the densest population, 52 records (61% of those in range)
Kew's description“wet tropical” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 85 georeferenced records inside the native range; the climate across the range on the 59 of them in the land cells it reads, of 61 placed to within 10 km; the map shows only the 51 openly licensed ones, which alone would put the marker 13 km away. 24 records outside the WCVP native range not used. 24 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 inside the densest 2° block of the 85 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Pityrogramma chrysophylla, photograph 1did not loadPityrogramma chrysophylla, photograph 2did not loadPityrogramma chrysophylla, photograph 3did not loadPityrogramma chrysophylla, photograph 4did not loadPityrogramma chrysophylla, photograph 5did not loadPityrogramma chrysophylla, photograph 6did not load

Photographs: (c) Guillaume Delaitre, some rights reserved (CC BY); author not stated, no rights reserved · CC0 (2); (c) Matteo Bellucci, some rights reserved (CC BY); (c) eml23, some rights reserved (CC BY); (c) Cy Stavros, some rights reserved (CC BY).

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

Eugenia cordata Eugenia cordata Lathberry Photo: CC BY, Matteo BellucciCoccothrinax barbadensis Coccothrinax barbadensis Puerto Rico silver palm Photo: CC BY, Matteo BellucciGarcinia humilis Garcinia humilis Wild mammee Photo: CC BY, Guillaume DelaitreBillbergia pyramidalis Billbergia pyramidalis Foolproofplant Photo: CC0, author not statedTabebuia pallida Tabebuia pallida White cedar Photo: CC BY, Matteo BellucciJacquemontia solanifolia Jacquemontia solanifolia Cambustera de costa Photo: CC BY-SA, Olivier Chiodi

Other Pityrogramma 4 in the reference

Pityrogramma austroamericana Pityrogramma austroamericana Leatherleaf goldback fern Photo: CC BY-SA, Greg TasneyPityrogramma calomelanos Pityrogramma calomelanos Dixie silverback fern Photo: CC BY, Irisa HudsonPityrogramma sulphurea Pityrogramma sulphurea Jamaican goldback fern Photo: CC0, DaderotPityrogramma trifoliata Pityrogramma trifoliata Threeleaf goldback fern Photo: CC BY, Franco Richieri

Names & registers

Also known as Acrostichum aculeatum; Acrostichum chrysophyllum; Ceropteris calomelanos var. chrysophylla; Ceropteris chrysophylla; Ceropteris herminieri and 24 more. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataiNaturalist

The record

Family
Pteridaceae
Described by
(Sw.) Link
Native to
Haiti, Leeward Is. AB Ant, Puerto Rico +2
Wild records
85 in range · 51 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 2026-10-22
GBIF species record gbif.species answeredasked 2026-10-22
GBIF synonyms gbif.synonyms answeredasked 2026-10-22
GBIF common names gbif.vernacular answeredasked 2026-10-22names fetched 2026-10-22
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; 7 records within 1 km of a botanic garden, herbarium or zoo left out (6 at a botanic garden or arboretum, 1 at a zoo; Wikidata's list)
Habitat climate climate answeredasked 2026-10-22
Daily extremes (NASA POWER) climate.extremes answeredasked 2026-10-22NASA POWER (MERRA-2) daily 1981–2024, cell 15.50_-61.250, lapse-corrected +78 m at 6.5 °C/km; read, and set aside: NASA POWER's cell is mostly sea (24% land), so no cold floor is shown
Wikidata wikidata answeredasked 2026-10-22
Wikipedia wikipedia nothing to reportasked 2026-10-22
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 2026-10-22
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 29 datasets via GBIF.org; each carries its own licence.

Cultifolio

Opening your plants…