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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
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To search the glossary, start typing, then select a word from the list.
Word
Definition
abruptly acute
Coming to a point abruptly, with angle at leaf tip less than 90 degrees
acicular
Slender, narrow and cylindrical, with a pungent point as in conifers
acostate
Nerveless
acrocarpous
Main stem usually erect, of limited growth, terminating in an inflorescence, further growth continued by branches or innovations.
acumen
Longly tapering narrow point; adj., acuminate.
acute
Pointed, with angle at leaf tip less than 90 degrees
alar cells
Cells at basal angles of leaf.
alternate
Leaves arranged alternately along the stem
amphithecium
Outer tissue of embryo giving rise to the outer layers and spore sac of the Sphagnopsida, to the outer layers only in the Andreaeopsida and Bryopsida.
anastomosing
The repeated division of veins into branches
angular cells
Cells at basal angles of leaf.
angulate
Angled edge of leaf
annulus
Ring or rings of cells at mouth of capsule associated with dehiscence of lid; adj., annular.
antheridium
Globose to fusiform or shortly cylindrical structure containing the antherozoids.
antherozoid
The biflagellate male gamete of bryophytes.
anthocyanin
Reddish pigment.
apiculus
Small abrupt projection at apex; adj.,apiculate
apophysis
Enlarged sterile basal portion of capsule
appendiculate
Of cilia, with transverse bars
arachnoid
Web-like
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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