AQUATIC FERNS
Filicopsida
Figure 1. Deep red-tinged Azolla fern growing mixed with water lettuce, floating on the water surface of a slow flowing canal
A listing of Hawaiian aquatic and riparian ferns, arranged by taxa, is provided elsewhere in CPIE.
|
Figure 2 (left). Aerial view of lower Lake Wilson (Wahiawa Reservoir) showing surface covered by Salvinia molesta. Photo by Brian Daniel.
|
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |||||
| 83a | (72) |
Fronds (leaves of ferns) pinnately branched bearing two rows
of crowded leaves, each only about 3 mm across and two-lobed. {
Growing in clusters in quiet waters (see Figure 1). Leaves usually tinged with reddish-purple.
Water fern~ Family AZOLLACEAE Azolla filiculoides Lam.
|
|||
| 83b |
Floating leaves in pairs, each leaf 1 to 2 cm long, distinctly folded
or with a midrib. Leaf covered on both surfaces with stiff hairs, but hairs on upper surface branching into 2 to 4 strands that rejoin at the tips (see photo inset). A third leaf accompanies each floating pair, growing downward being highly
dissected, filiform (root-like) in shape. { Grown in decorative ponds,
recently naturalized. Giant salvinia~ Family SALVINIACEAE Salvinia molesta D.S. Mitchell
|
||||
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |||||
Figure 3. Marsilea villosa, water fern, or `ihi`ihi is a very rare fern known from only a few sites on O`ahu. This plant grows in vernal (emphemeral) ponds in relatively dry, leeward areas. Endemic and listed as an endangered species. |
|||||