RE: Java Fern
G'day plant people,
Dave Gomberg wrote-
<AFAIK, there are two genetically different types of Java fern. At
least two. I have both and so does Neil Frank and I think Erik Olsen
does too. Neil calls them narrow and broad leaf, I call them big and
little. Big has 10" fronds typically, they are cross-shaped (two
pinnae on the frond about 2/3 of the way to the tip) and medium
green. The frond surface is slightly crinkly. Little has 2-3"
fronds, they are lanceolate and dark green, with a smooth surface.
Big grows more spread out, little grows in a clump.
My opinion is that the narrow/small form is probably Microsorium brassii, a species found in New Guinea and Manus Island ( and probably other places too) . Ususl habitat is in small streams at low alitudes between high and low water levels. I have seen it completely submerse in nature growing on rocks and submerged stumps in the streams around Kikori.
Leach G.J. & Osborne P.L. : Freshwater Plants of Papua New Guinea.
University of PNG Press, 1985. pages 57-59.
Under cultivation it seems not to be as vigorous as M. pteropus and the submerse form is much more sensitive to dessication. Try attaching it to lava/ barbeque rock as a substrate so no root rot is initiated from bogwood and it can be easily transferred if it is not thriving.
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