Trichomanes speciosum (gametophyte)

Tracheophyta PteropsidaHymenophyllaceaeTrichomanesTrichomanes speciosum (gametophyte)


The gametophyte of T. speciosum grows deep in clefts, crevices and natural rock hollows on a range of acidic to neutral rocks. Such sites are dark (less than 1% ambient light) and are often humid, being located on sea-cliffs, river-cliffs or streamsides, or are kept damp through soil capillary action. 0-530 m (Moel yr Ogof, Caerns.).



World Distribution

Gametophytes occur within the European range of the sporophyte, but also extend eastwards to C. Europe.

Broad Habitats

Inland rock (quarries, cliffs, screes)

Light (Ellenberg): 2

Moisture (Ellenberg): 7

Reaction (Ellenberg): 7

Nitrogen (Ellenberg): 3


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.8

July Mean Temperature (Celsius): 14.2

Annual Precipitation (mm): 1390

Life form information

Height (cm): 35

Perennation - primary


Life Form - primary




Clonality - primary

Rhizome shortly creeping

Clonality - secondary

Detaching ramets on prothallus (Trichomanes)

Count of 10km squares in Great Britain: 162

Count of 10km squares in Ireland: 62

Count of 10km squares in the Channel Isles: 0

Atlas Change Index: 2.23

Distribution information

Plantatt Conservation Status


JNCC Designations


PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.

Atlas text references

Atlas (5c) Curtis TGF, McGough HN
1988.  The Irish Red Data Book. 1. Vascular Plants.
Jalas & Suominen (1972) Bangerter EB, Cannon JFM, Jermy AC
1978.  Ferns and their allies. The Island of Mull: a survey of its flora and environment. :12.1-12.7. Page CN
1997.  The ferns of Britain and Ireland, edn 2. Wigginton MJ
1999.  British Red Data Books. 1. Vascular plants, edn 3.