-
specific epithet (costuligera) is
derived from the
Latin costula,
meaning "a
costule or rib" (strictly the
midrib of a fern frond) and -ger
meaning "-bearing"...
-
costa and
costules;
dorsal surface often glaucous and with
often imbricate lanceolate lacerate brown scales up to 3 mm. long
along the
costules and costae...
- flat whorls,
separated by
shallow sutures,
adorned with
small oblique costules at the
lower part.
These straighten up
abruptly and
cover the
entire surface...
- base rounded-blunt,
above nearly glabrous,
beneath particularly along the
costules and
venules beset with very
short hairlets ; sti****s
almost deltoid, incised...
- bear from one to
three pairs of sori per
pinnule on both
sides of the
costule (pinnule midvein). They are
covered by
indusia 2 to 5
millimetres (0.08...
-
adaxial sulcus of the
rachis is
continuous with that of the
costae and
costules. The name of the
genus references the name
given to
imperial guards from...
-
Scattered tiny
hairs are
present on the
underside (only) of the costae,
costules, and some veins. Sori are at the edge of the leaf with straw-colored pseudoindusia...
-
edges are
bluntly serrated or
shallowly lobed less than half-way to the
costule,
abaxially decurrent, and the apex is obtuse. Sori 2–3 mm long, 3–5 per...
-
obtuse (blunt) at the tip, and are
generally attached directly to the
costule (pinnule axis),
without stalks. They are not
jointed at the base. The sori...
-
whorl of the
protoconch is
adorned at the top with
arched longitudinal costules and, below, with a very fine and
tight diagonally cancellated sculpture...
