This hybrid is accepted
The native range of this hybrid is Medit. It is a tuberous geophyte and grows primarily in the subtropical biome. The hybrid formula is O. fusca × O. omegaifera. (Link)
POWO accepts this as Tectaria singaporiana but World Ferns as Tectaria singaporeana. However, both refers to the same publication which describes this as T. singaporiana: https://www.biodiversitylibrary.org/page/57889250#page/404/mode/1up In my opinion the correct one should be T. singaporiana
Unintended disagreements occur when a parent (B) is
thinned by swapping a child (E) to another part of the
taxonomic tree, resulting in existing IDs of the parent being interpreted
as disagreements with existing IDs of the swapped child.
Identification
ID 2 of taxon E will be an unintended disagreement with ID 1 of taxon B after the taxon swap
If thinning a parent results in more than 10 unintended disagreements, you
should split the parent after swapping the child to replace existing IDs
of the parent (B) with IDs that don't disagree.
POWO accepts this as Tectaria singaporiana but World Ferns as Tectaria singaporeana. However, both refers to the same publication which describes this as T. singaporiana: https://www.biodiversitylibrary.org/page/57889250#page/404/mode/1up
In my opinion the correct one should be T. singaporiana