Australian Biological Resources Study
Fern definitions mostly compiled by Mary D.Tindale
(definitions of conifer terms provided by K.D.Hill)
| A | B | C | D | E | F | G | H | I | J-K | L | M | N | O | P-Q | R | S | T | U | V | W-Z | Back to Glossaries
incised: cut deeply, sharply and often irregularly (an intermediate condition between toothed and lobed).
incurved: bent or curved inwards or upwards; of leaf margins, curved towards the adaxial surface.
indumentum: the epidermal appendages, e.g. hairs or scales, collectively.
indurated: hardened.
indusiate: bearing an indusium.
indusium: the covering of a sorus, either a specialised organ or the incurved margin of the lamina.
internal hairs: in leaves of Isoetes, projections into the lacunae.
involucre: the indusium of members of the Hymenophyllaceae.
isophyllous: leaves equal in size and shape at any point on the branch. cf. anisophyllous.
isotomous: having all dichotomies resulting in equally thin branches. cf. anisotomous.
isovalvate: having the two valves of a sporangium equal in size. cf. anisovalvate.