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Asplenium exiguum; photograph (c) Cheng-Te Hsu, some rights reserved (CC BY) CC BY(c) Cheng-Te Hsu, some rights reserved (CC BY) · observed growing wild · 2026-05-21

Asplenium exiguum Bedd.

Little spleenwort

Aspleniaceae · India, Myanmar +1 · listed by its genus as a fern or moss

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Asplenium exiguum, photograph (c) Cheng-Te Hsu, some rights reserved (CC BY)Asplenium exiguum, photograph (c) Jacy Chen, some rights reserved (CC BY)Asplenium exiguum, photograph (c) Jacy Chen, some rights reserved (CC BY) 4 photographs ›
Habitat figuresfrom few records
Coldest month, mean nightly low
8.6°C
Jan at the habitat, not a floor; extremes not used (the weather cell's ground is too far off) CHELSA
Warmest month, mean daily high
26°C
May and Jun at the habitat CHELSA
Rain a year (median across the range)
2,935mm
11 months of 25 mm or more in the median year CHELSA
Open-sky light
24–44DLI
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
Wet summers: the rain comes July to September, read as a summer growing season. rain rule, CHELSA
Northern hemisphere unless you set your site. The chart is in the habitat's months.

From few records: 4 records in 3 grid cells. The records.

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

Grouped as a fern or moss, listed under the genus Asplenium in the archetype table, and Kew describes it as “perennial”.

Seasons

The rain rule reads a summer growing season: 70% of the median year's rain (1,552 mm of 2,186 mm) falls in July to September, warmer than the year (wet-season mean 20.5 °C against a yearly mean of 17.1 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: January to March.

Rain

2,186 mm in the median year at the habitat, 1,552 mm of it July to September. Wettest month August at 637 mm, driest month November at 17 mm. Across the grid cells of the range the year's total runs 1,633 mm to 2,959 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 2,935 mm, is the year's rain at the top of the page; the 2,186 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: 24 to 44 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 20, the highest 90th-percentile month 46).

Warmth and air
Temperature

Monthly means: the coldest month's mean nightly low 8.6 °C in January (across the grid cells of the range 1.4 °C to 10.8 °C), the warmest month's mean daily high 26.1 °C in May and June (median year across the grid cells of the range, CHELSA). Cold floor: none read. The nearest figure is 8.6 °C, the coldest month's mean nightly low, January, 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 whose ground is too far above or below the typical spot to correct for, and are not used.

Humidity

Relative humidity at the habitat: 45 to 72% 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.

Group. Listed under the genus Asplenium in the archetype table, and Kew describes it as “perennial”. A group is taken only where Kew's description of the species agrees with the table's listing. The table gives no figure and no prose; the cold floor is the habitat's alone.

Climate across the habitat

From few records: this habitat climate is read from 4 records in 3 grid cells; a page says so under 12 records or 5 cells, and shows the figures as read.

Habitat months, northern hemisphere

Habitat climate of Asplenium exiguum through the yearWarmest months May and June, mean daily high 26 °C; coldest month January, mean nightly low 8.6 °C; 2,186 mm of rain in the median year (the twelve monthly medians added). Medians across the range, from CHELSA. Habitat months, northern hemisphere.0°10°20°30°40°°C · day and nightcold quarter02004006008001000mm rainDLI 24–44RH 45–72%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 3 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 °C16 / 13–2317 / 15–2618 / 18–3023 / 20–3526 / 21–3726 / 21–3424 / 20–2823 / 20–2723 / 19–2821 / 19–2817 / 17–2616 / 15–23
Night °C9 / 1–119 / 3–1310 / 6–1711 / 10–2113 / 12–2416 / 13–2518 / 13–2317 / 14–2214 / 13–2112 / 9–1811 / 6–149 / 3–12
Rain mm31 / 26–7531 / 23–7457 / 24–7756 / 15–12195 / 31–285233 / 170–352505 / 404–819637 / 440–835410 / 277–41380 / 42–24117 / 13–7634 / 17–40
DLI27 / 22–2932 / 27–3537 / 34–4141 / 40–4544 / 36–4636 / 32–3927 / 24–2925 / 22–2629 / 28–2929 / 29–3327 / 24–3024 / 20–28
RH %53 / 51–6253 / 48–6350 / 43–6045 / 38–6048 / 40–6358 / 53–6770 / 67–7172 / 70–7367 / 65–6954 / 52–6453 / 50–6351 / 50–63

The daily extremes were not used: the correction for elevation, +1285 m, is beyond the 1,000 m either way that a lapse rate is applied over, so the weather cell's ground is other terrain than the typical spot's. So no cold floor is read for this species, and the coldest month's mean nightly low is not taken as one. What that cell gave, so corrected, over 44 years: absolute minimum 0.8 °C, 1st-percentile night 5.2 °C.

How this section is made
Each figure is the median across the 3 grid cells holding the 4 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 1467:6017 (16.625, 120.875). 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 3 distinct grid cells holding 4 of the 4 in-range records; extremes and elevation at the typical cell 1467:6017 (its coldest month's mean nightly low nearest the median across cells); its position is the cell centre. Extremes: NASA POWER (MERRA-2) daily 1981–2024, cell 16.50_120.625, lapse-corrected +1285 m at 6.5 °C/km. Elevation: ETOPO 2022, 2001 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.
NativeIndia, Myanmar, Philippines · 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 marker26.56, 100.176 · in the densest population, 14 records (40% of those in range)
Kew's description“perennial” · “wet tropical” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 35 georeferenced records inside the native range; the climate across the range on the 4 of them placed to within 10 km; the map shows only the 26 openly licensed ones, which alone would put the marker 25 km away. 295 records outside the WCVP native range not used. Under a dozen records behind the climate. 31 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 35 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 exiguum, photograph 1did not loadAsplenium exiguum, photograph 2did not loadAsplenium exiguum, photograph 3did not load

Photographs: (c) Cheng-Te Hsu, some rights reserved (CC BY); (c) Jacy Chen, some rights reserved (CC BY) (2).

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

Arisaema tortuosum Arisaema tortuosum Araceae Photo: CC BY, Patricia RoseCinnamomum tamala Cinnamomum tamala Indian bark Photo: CC0, author not statedBuddleja paniculata Buddleja paniculata Scrophulariaceae Photo: CC0, Andrew BrookesPrunus cerasoides Prunus cerasoides Wild Himalayan cherry Photo: CC BY, Sagnik Dutta RoyDendrobium heterocarpum Dendrobium heterocarpum Orchidaceae Photo: CC BY, Thomas GalewskiAdiantum edgeworthii Adiantum edgeworthii Pteridaceae Photo: CC BY, Brodie Cass Talbott

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

GBIFPOWOIPNIWFOWikidataiNaturalist

The record

Family
Aspleniaceae
Described by
Bedd.
Native to
India, Myanmar, Philippines
Wild records
35 in range · 26 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; 2 records within 1 km of a botanic garden, herbarium or zoo left out (2 at a herbarium; 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 16.50_120.625, lapse-corrected +1285 m at 6.5 °C/km; read, and set aside: the correction for elevation, +1285 m, is beyond the 1,000 m either way that a lapse rate is applied over, so the weather cell's ground is other terrain than the typical spot's, so no cold floor is shown
Wikidata wikidata answeredasked 2026-10-21
Wikipedia wikipedia nothing to reportasked 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
Wikimedia Commons commons nothing to reportasked 2026-10-21
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 56 datasets via GBIF.org; each carries its own licence.

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