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Adiantum venustum; photograph (c) Paulmathi Vinod, some rights reserved (CC BY) CC BY(c) Paulmathi Vinod, some rights reserved (CC BY) · observed growing wild · 2015-05-12

Adiantum venustum D.Don

Himalayan maidenhair; Himalayan maidenhair fern; Evergreen maidenhair

Pteridaceae · Afghanistan, China South-Central +9

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Adiantum venustum, photograph (c) Paulmathi Vinod, some rights reserved (CC BY)Adiantum venustum, photograph (c) Jiao Sun (孙娇), some rights reserved (CC BY)Adiantum venustum, photograph Kembangraps, CC BY-SA 3.0, via Wikimedia CommonsAdiantum venustum, photograph Denis.prévôt, CC BY-SA 3.0, via Wikimedia CommonsAdiantum venustum, photograph Denis.prévôt, CC BY-SA 3.0, via Wikimedia CommonsAdiantum venustum, photograph Denis.prévôt, CC BY-SA 3.0, via Wikimedia Commons 15 photographs ›
Habitat figures
Coldest month, mean nightly low
-11.2°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
19°C
Jul and Aug at the habitat CHELSA
Rain a year (median across the range)
1,307mm
10 months of 25 mm or more in the median year CHELSA
Open-sky light
22–44DLI
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 May 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.

Summary

Adiantum venustum, the evergreen maidenhair or Himalayan maidenhair, is a species of fern in the genus Adiantum of the family Pteridaceae, native to China and the Himalayas. It is a slow to establish plant that usually grows on moist rocks and soil with a good amount of humus and dead leaves. It is very hardy, largely evergreen to −10 °C, when it becomes deciduous. It is also known as black Hansraj in India for its black stalks at the fronds.

Quoted from Wikipedia, "Adiantum venustum", CC BY-SA 4.0.

About the genus · Adiantum

Adiantum, the maidenhair fern, is a genus of about 250 species of ferns in the subfamily Vittarioideae of the family Pteridaceae, though some researchers place it in its own family, Adiantaceae. The genus name comes from Greek, meaning "unwetted", referring to the fronds' ability to shed water without becoming wet.

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

Cultivation

Seasons

The rain rule reads a summer growing season: 70% of the median year's rain (805 mm of 1,140 mm) falls in May to September, warmer than the year (wet-season mean 12.9 °C against a yearly mean of 5.3 °C). Months are the habitat's, northern hemisphere; shifted six months for a southern-hemisphere collection: November to March.

Rain

1,140 mm in the median year at the habitat, 805 mm of it May to September. Wettest month July at 217 mm, driest month November at 18 mm. Across the grid cells of the range the year's total runs 707 mm to 2,343 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 1,307 mm, is the year's rain at the top of the page; the 1,140 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: 22 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 17, the highest 90th-percentile month 50).

Warmth and air
Temperature

Monthly means: the coldest month's mean nightly low -11.2 °C in January (across the grid cells of the range -20.9 °C to 3.5 °C), the warmest month's mean daily high 18.8 °C in July (median year across the grid cells of the range, CHELSA). Cold floor: none read. The nearest figure is -11.2 °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: 53 to 66% 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 Adiantum venustum through the yearWarmest months July and August, mean daily high 19 °C; coldest month January, mean nightly low -11.2 °C; 1,140 mm of rain in the median year (the twelve monthly medians added). Medians across the range, from CHELSA. Habitat months, northern hemisphere.-30°-20°-10°0°10°20°30°40°frost°C · day and nightcold quarter0200400600800mm rainDLI 22–44RH 53–66%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 41 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 °C0 / -8–152 / -6–166 / -2–209 / 3–2414 / 8–2917 / 13–3219 / 14–2919 / 14–2816 / 12–2712 / 6–236 / -1–190 / -6–16
Night °C-11 / -21–4-10 / -17–4-6 / -13–7-2 / -8–112 / -3–157 / 2–1910 / 5–2110 / 5–206 / 1–171 / -6–12-6 / -13–8-10 / -20–5
Rain mm34 / 4–14248 / 8–19163 / 20–21687 / 23–175109 / 36–164163 / 61–281217 / 104–601177 / 86–521139 / 58–31366 / 24–9718 / 7–4419 / 4–87
DLI24 / 19–2730 / 24–3437 / 31–4243 / 39–4744 / 37–5040 / 32–4737 / 28–4234 / 26–3831 / 26–3729 / 23–3425 / 21–2922 / 17–25
RH %54 / 48–6155 / 50–6255 / 50–6155 / 46–6057 / 47–6459 / 49–6866 / 59–7266 / 58–7163 / 55–6858 / 47–6555 / 45–6153 / 46–60

The daily extremes were not used: the correction for elevation, -1745 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 -22.2 °C, 1st-percentile night -12.3 °C.

How this section is made
Each figure is the median across the 41 grid cells holding the 44 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 1232:5306 (28.375, 85.325). 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 41 distinct grid cells holding 44 of the 44 in-range records; extremes and elevation at the typical cell 1232:5306 (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 28.50_85.625, lapse-corrected -1745 m at 6.5 °C/km. Elevation: ETOPO 2022, 3091 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.
NativeAfghanistan, China South-Central, China North-Central, Qinghai, Tibet, Assam, East Himalaya, Nepal, Pakistan, West Himalaya, Myanmar · 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 marker30.907, 102.65 · in the densest population, 97 records (42% of those in range)
Kew's description“temperate” · quoted from WCVP, RBG Kew (CC BY 4.0); not derived here
Evidence usedThe map marker rests on all 232 georeferenced records inside the native range; the climate across the range on the 44 of them placed to within 10 km; the map shows only the 138 openly licensed ones, which alone would put the marker 190 km away. 22 records outside the WCVP native range not used. 188 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.
Other GBIF keysRecords also from GBIF's key 10385356 (Adiantum venustum G.Don): Kew's file holds it as Adiantum venustum D.Don (accepted); 32 records, from GBIF's search API on the day of the build.
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 232 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Adiantum venustum, photograph 1did not loadAdiantum venustum, photograph 2did not loadAdiantum venustum, photograph 3did not loadAdiantum venustum, photograph 4did not loadAdiantum venustum, photograph 5did not loadAdiantum venustum, photograph 6did not load

Photographs: (c) Paulmathi Vinod, some rights reserved (CC BY); (c) Jiao Sun (孙娇), some rights reserved (CC BY); Kembangraps, CC BY-SA 3.0, via Wikimedia Commons; Denis.prévôt, CC BY-SA 3.0, via Wikimedia Commons (3).

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

Campanula pallida Campanula pallida Himalayan bellflower Photo: CC BY, Anastasia TitovetsIris decora Iris decora Nepal iris Photo: CC BY, Sagnik Dutta RoyArisaema flavum Arisaema flavum Yellow Cobra Lily Photo: CC BY, 王天Astragalus galegiformis Astragalus galegiformis Fabaceae Photo: CC BY, Maria Kohanovskaya Thymus daghestanicus Lamiaceae Dianthus caucaseus Dianthus caucaseus Caryophyllaceae Photo: CC BY, Наталья Пикалова

Other Adiantum 42 in the reference

Adiantum aethiopicum Adiantum aethiopicum Pteridaceae Photo: CC BY, Ian RainbowAdiantum aleuticum Adiantum aleuticum Aleutian maidenhair fern Photo: CC BY, John BrewAdiantum amplum Adiantum amplum Pteridaceae Photo: CC BY, Alexis López HernándezAdiantum anceps Adiantum anceps Double edge maidenhair Photo: CC0, author not statedAdiantum andicola Adiantum andicola Pteridaceae Photo: CC BY, Juan Cruzado CortésAdiantum atroviride Adiantum atroviride Pteridaceae Photo: CC BY-SA, Greg TasneyAdiantum capillus-veneris Adiantum capillus-veneris Maidenhair fern Photo: CC BY, zebedeugalinhaAdiantum caudatum Adiantum caudatum Tailed maidenhair Photo: CC BY, 林正文Adiantum chilense Adiantum chilense Chilean Maidenhair Fern Photo: CC0, author not statedAdiantum concinnum Adiantum concinnum Polished maidenhair Photo: CC BY, Carlos Domínguez-RodríguezAdiantum cunninghamii Adiantum cunninghamii Cunningham's maidenhair Photo: CC BY, Hannah Rogers Adiantum curvatum Pteridaceae all 43 ›

Names & registers

Also known as Adiantum argutum; Adiantum bonatianum; Adiantum bonatianum var. bonatianum; Adiantum bonatianum var. subaristatum; Adiantum breviserratum and 11 more. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Pteridaceae
Described by
D.Don
Native to
Afghanistan, China South-Central, China North-Central +8
Wild records
232 in range · 138 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 answeredasked 2026-10-21GBIF occurrence download https://doi.org/10.15468/dl.hbdw64, of 2026-10-21; 32 records of GBIF's key 10385356, Adiantum venustum G.Don (Kew's file holds it as Adiantum venustum D.Don (accepted)): GBIF occurrence search API; 3 records within 1 km of a botanic garden, herbarium or zoo left out (2 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 28.50_85.625, lapse-corrected -1745 m at 6.5 °C/km; read, and set aside: the correction for elevation, -1745 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 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
Wikimedia Commons commons answeredasked 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 41 datasets via GBIF.org; each carries its own licence.

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