This is a species which in its early days is sometimes confused with the
Black Maidenhair Spleenwort. The fronds, which are lanceolate in outline
and about four inches to a foot in length, arise from a tufted
root-stock; the stipes is usually about a third of the frond. The colour
of the stipes, and also part of the rachis, is bright brown, and this
contrasts finely with the handsome green of the leafy portion. The actual
length of the fronds will vary to a considerable extent, this depending
upon the amount of moisture available. The design of the frond, when it
is developed, shows by its lanceolate outline a marked feature which
distinguishes it from the triangular outline to be seen in the case of
the Black Maidenhair Fern. The frond is twice pinnate, and as a rule the
pinnæ are opposite; these are roughly egg-shaped in form. The pinnules
have serrated margins.
The sori are placed on veins which branch out from the mid-veins of the
pinnules. At first the collections of sporangia are long and narrow, and
covered with a white indusium. As the capsules mature the sori spread out
over the under-surface of the frond.
The Lanceolate Spleenwort is usually met with near to the sea or in
mountainous districts. It is rather local, although it sometimes occurs
in great plenty on damp rocks. It is said not to occur in Scotland. In a
suitable rocky corner there is no reason why the Lanceolate Spleenwort
should not be grown in a garden. The situation should be well drained,
but a sufficiency of water is needed. The Lanceolate Spleenwort remains
green throughout the winter.
_Asplenium marinum._ The specific name _marinum_ has, of course,
reference to the fact that the Fern is to be found near the sea. The Sea
Spleenwort.
This is an interesting and a most beautiful species, often growing
abundantly from the roof-crevices of caves on the coast. The root-stock
of this plant is stout, and from it are produced a large number of fine
black roots which penetrate into the rocky fissures. The fronds are, as a
rule, four or five inches in length, though in favourable situations they
may be very much longer. The stipes is somewhat short, hardly ever more
than a third of the length of the frond, and sometimes less than this. In
most cases the stipes is of a purple colour, and the leafy portion of the
frond is of an exceptionally fine green shade. The leaves are freely
produced in tufts and are roughly lanceolate in outline. The fronds of
the Sea Spleenwort are only once pinnate, the pinnæ—which are usually
about an inch in length—being, as a rule, oblong in outline. They are,
however, decidedly variable in form, some being egg-shaped. A curious
feature of the pinnæ is that they are unequal in shape at the base, the
lower part appearing to have been cut off whilst the upper portion is
greatly enlarged. Between the lower pinnæ the rachis is winged, but this
feature disappears at the tip of the frond where the pinnæ run together.
Public-domain text, read in full here on John Shaqi.
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