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The Ferns Identifier for the British Isles
Learn about ferns, Identify your fern specimen.
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general
leaf arrangement
leaf bases
leaf lobes
leaf margins
leaf surface
leaf tips
moss
venation
whole leaves
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To search the glossary, start typing, then select a word from the list.
Word
Definition
innovating
Producing new branches, usually from below inflorescence.
insertion
Line of attachment of leaf.
involute
Strongly rolled upwards and inwards
isodiametric
Radially symmetrical, as wide as long.
isophyllous
Stem and branch leaves similar.
julaceous
Cylindrical and worm-like in appearance because of the imbricate arrangement of leaves.
keeled
Sharply folded like the keel of a boat.
lacerate
Irregularly lobed with deep incisions that look as if they were torn.
laciniate
Slashed; similar to incised, but the cuts are sharply angled.
lamellae
Flat plates of cells.
lamina
Leaf blade as distinct from leaf nerve.
lanate
Fine dense branched hairs
lanceolate
Lance-shaped, about three times as long as wide
lax
Of cells, large with thin often bulging walls
lepidose
Cracked appearance
lid
Operculum, dehiscent top of capsule.
ligulate
Strap-shaped, narrow and parallel-sided
limb
Upper part of leaf when leaf is differentiated into basal and upper part.
linear
Long, narrow and parallel-sided
lingulate
Tongue-shaped, broad and parallel-sided
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Ferns
Adiantaceae
Adiantum
Anogramma
Cryptogramma
Aspidiaceae
Dryopteris
affinis
Gymnocarpium
Polystichum
Aspleniaceae
Asplenium
obovatum
trichomanes
Athyriaceae
Athyrium
distentifolium
Cystopteris
Woodsia
Azollaceae
Azolla
Blechnaceae
Blechnum
Dennstaedtiaceae
Pteridium
aquilinium
Hymenophyllaceae
Hymenophyllum
Trichomanes
Marsileaceae
Pilularia
Ophioglossaceae
Botrychium
Ophioglossum
Osmundaceae
Osmunda
Polypodiaceae
Polypodium
Pteridaceae
Pteris
Thelypteridaceae
Oreopteris
Phegopteris
Thelypteris