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In
Tasmania, Leptodictyum is represented by a single species,
L.
riparium. This species is sometimes included under the genus
Amblystegium, with which it shares many similarities. L.
riparium is an uncommon aquatic to semi-aquatic species. When
not fruiting it can be very difficult to separate from other members
of the Amblystegiaceae that grow in similar environments.
The olive green to browish or golden brownish and roughly pinnate
shoots reach 6 cm or slightly longer. The lance-like leaves are
wide-spreading and are channeled near the base but flat above. The
nerve is faint and indistinct.
Sporophytes appear to be rare. The capsules are short and fat
with a conical unbeaked operculum and are held horzontally on short
stalks
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