Example ⟳ +
An example collection, so you can see what this page does. Nothing added here is kept: leaving deletes it.
Lindsaea linearis; photograph (c) Hugo Innes, some rights reserved (CC BY) CC BY(c) Hugo Innes, some rights reserved (CC BY) · observed growing wild · 2026-09-18

Lindsaea linearis Sw.

Screw Fern

Lindsaeaceae · New South Wales, Queensland +8

Add one to my plants
Sow seed
Lindsaea linearis, photograph (c) Hannah Rogers, some rights reserved (CC BY)Lindsaea linearis, photograph author not stated, no rights reservedLindsaea linearis, photograph (c) Hugo Innes, some rights reserved (CC BY)Lindsaea linearis, photograph (c) Hugo Innes, some rights reserved (CC BY)Lindsaea linearis, photograph author not stated, no rights reservedLindsaea linearis, photograph author not stated, no rights reserved 83 photographs ›
Habitat figures
Cold floor (1 night in 100)
4.5°C
Record low 1.0 °C in 44 years, at a typical spot in the range NASA POWER
Warmest month, mean daily high
24°C
Jan and Feb at the habitat CHELSA
Rain a year (median across the range)
1,005mm
12 months of 25 mm or more in the median year CHELSA
Open-sky light
13–43DLI
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.

Summary

Lindsaea linearis is known as the screw fern, as the fronds may have a twisting appearance. It has a creeping stem with fronds that can grow up to 50 cm (20 in) in length. It is a small fern of widespread distribution in many parts of Australia, as well as New Zealand and New Caledonia. Found in a variety of habitats, often near swamps or moist places and by rocks, heathland or open forest. More on Wikipedia ›

Quoted from Wikipedia, "Lindsaea linearis", CC BY-SA 4.0.

Cultivation

Seasons

The rain rule reads no short rainy season: 70% of the median year's rain (681 mm of 972 mm) takes 8 months, April to August and October to December. Mean temperature moves 9.2 °C between the warmest and coldest month. Months are the habitat's, southern hemisphere; shifted six months for a northern-hemisphere collection: October to February and April to June.

Rain

972 mm in the median year at the habitat, 681 mm of it April to August and October to December. Wettest month June at 96 mm, driest month March at 71 mm. Across the grid cells of the range the year's total runs 760 mm to 1,372 mm, the 10th to 90th percentile of each cell's own year. The median of the cells' own yearly totals, 1,005 mm, is the year's rain at the top of the page; the 972 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: 13 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 11, the highest 90th-percentile month 46).

Warmth and air
Temperature

Coldest: the 1st-percentile night over 44 years at a typical spot in the range is 4.5 °C, the absolute minimum 1.0 °C, no frost in 44 years (NASA POWER daily minima). Warmest: the 99th-percentile day is 35.6 °C. Monthly means: the coldest month's mean nightly low 6.8 °C in July (across the grid cells of the range 3.1 °C to 10.3 °C), the warmest month's mean daily high 23.9 °C in January (median year across the grid cells of the range, CHELSA). Cold floor: 4.5 °C, which is the 1st-percentile night over 44 years at a typical spot in the range (NASA POWER).

Humidity

Relative humidity at the habitat: 59 to 61% 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. NASA POWER daily minima and maxima over 44 years at a typical spot in the range, lapse-corrected +55 m to its elevation; CHELSA monthly means, median year across the grid cells of the range. The cold floor is the 1st-percentile night named in its sentence. 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, southern hemisphere

Habitat climate of Lindsaea linearis through the yearWarmest months January and February, mean daily high 24 °C; coldest month July, mean nightly low 6.8 °C; 972 mm of rain in the median year (the twelve monthly medians added). Medians across the range, from CHELSA; the extremes at the edge from NASA POWER. Habitat months, southern hemisphere.0°10°20°30°40°35.6° 99th-percentile day, NASA POWER1.0° lowest night in 44 years, NASA POWER°C · day and nightcold quarter050100150200mm rainDLI 13–43RH 59–61%JanFebMarAprMayJunJulAugSepOctNovDec
day night rain medians and 10th–90th percentile across 974 habitat cells, CHELSA cold quarter: the three months around the coldest month's mean nightly low extremes over 44 years at a typical spot in the range, from NASA POWER, marked at the edge, in no month DLI, mol/m²/dayRH %each on its own scale
Figures by month
JanFebMarAprMayJunJulAugSepOctNovDec
Day °C24 / 19–2624 / 19–2622 / 18–2419 / 16–2116 / 13–1913 / 11–1612 / 10–1613 / 11–1716 / 13–2018 / 14–2220 / 16–2322 / 17–25
Night °C15 / 12–1915 / 13–2014 / 11–1812 / 9–1610 / 6–148 / 4–117 / 3–107 / 4–119 / 5–1210 / 7–1412 / 9–1614 / 11–18
Rain mm72 / 36–11675 / 30–15371 / 44–12083 / 53–13386 / 61–13196 / 64–14483 / 55–15177 / 53–14173 / 53–11582 / 61–10690 / 55–11484 / 49–114
DLI43 / 40–4638 / 34–4131 / 29–3223 / 20–2516 / 14–1913 / 11–1615 / 12–1820 / 17–2427 / 24–3236 / 33–3840 / 39–4343 / 41–46
RH %60 / 56–6361 / 57–6461 / 58–6361 / 59–6361 / 59–6461 / 58–6661 / 57–6559 / 55–6459 / 55–6359 / 56–6160 / 58–6260 / 57–62
How this section is made
Each figure is the median across the 974 grid cells on land that hold in-range records (1720 records in those cells; 3 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 2470:6621 (-33.525, 151.075). Over 44 years there: absolute minimum 1.0 °C, 1st-percentile night 4.5 °C, 99th-percentile day 35.6 °C. 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 974 distinct grid cells holding 1720 of the 1723 in-range records (3 further cells with records at sea, by the elevation layer, left out); extremes and elevation at the typical cell 2470:6621 (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 -33.50_151.250, lapse-corrected +55 m at 6.5 °C/km. Elevation: ETOPO 2022, 154 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.
NativeNew South Wales, Queensland, South Australia, Tasmania, Victoria, Western Australia, Chatham Is., New Zealand North, New Zealand South, New Caledonia · 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-33.538, 151.28 · in the densest population, 1477 records (82% of those in range)
Evidence usedThe map marker rests on all 1806 georeferenced records inside the native range; the climate across the range on the 1720 of them in the land cells it reads, of 1723 placed to within 10 km; the map shows only the 1501 openly licensed ones, which alone would put the marker 1 km away. 1 record outside the WCVP native range not used. 83 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 4° block of the 1806 in-range records; it decides nothing. Records outside the native range, living specimens and records marked introduced are not used; which records count.

Photographs

Lindsaea linearis, photograph 1did not loadLindsaea linearis, photograph 2did not loadLindsaea linearis, photograph 3did not loadLindsaea linearis, photograph 4did not loadLindsaea linearis, photograph 5did not loadLindsaea linearis, photograph 6did not load

Photographs: (c) Hannah Rogers, some rights reserved (CC BY); author not stated, no rights reserved · CC0 (3); (c) Hugo Innes, 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.

Solanum vescum Solanum vescum Green kangaroo-apple Photo: CC BY-SA, Lachlan CopelandPteris tremula Pteris tremula Australian brake Photo: CC BY, ShaunGahnia sieberiana Gahnia sieberiana Red-fruit Saw-sedge Photo: CC0, author not statedHibbertia empetrifolia Hibbertia empetrifolia Trailing guinea flower Photo: CC BY, Petra HollandEleocharis sphacelata Eleocharis sphacelata Bamboo Spike Sedge Photo: CC BY, Bryce Watts-ParkerLasiopetalum macrophyllum Lasiopetalum macrophyllum Shrubby velvet bush Photo: CC BY-SA, James K. Douch

Other Lindsaea 3 in the reference

Lindsaea ensifolia Lindsaea ensifolia Graceful necklace fern Photo: CC BY, Lucas ChristofidesLindsaea orbiculata Lindsaea orbiculata Lindsaeaceae Photo: CC BY, chiuluanLindsaea trichomanoides Lindsaea trichomanoides Oval Wedge-Fern Photo: CC BY-SA, Christopher Stephens

Names & registers

Also known as Adiantum lineare; Lindsaea imbricata; Lindsaea linearis var. cuneata; Lindsaea linearis var. trilobata; Lindsaea linearis var. typica and 2 more. (GBIF Backbone)

GBIFPOWOIPNIWFOWikidataWikipediaiNaturalist

The record

Family
Lindsaeaceae
Described by
Sw.
Native to
New South Wales, Queensland, South Australia +7
Wild records
1806 in range · 1501 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; 20 records within 1 km of a botanic garden, herbarium or zoo left out (15 at a botanic garden or arboretum, 1 at a herbarium, 4 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 -33.50_151.250, lapse-corrected +55 m at 6.5 °C/km
Wikidata wikidata answeredasked 2026-10-22
Wikipedia wikipedia answeredasked 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 36 datasets via GBIF.org; each carries its own licence.

Cultifolio

Opening your plants…