Hymenophyllaceae

This family is known as "filmy ferns" as the fronds are thin and translucent. The sporangia are placed along the margin of the fronds and are protected either by tubular or two-flapped indusia. These ferns tend to curl up when dry, but quickly revive when moistened.

This family contains the easily recognised "kidney fern".

The Hymenophyllum genus has two-flapped indusia, whereas the Trichomanes genus has a tubular indusia with a wide mouth.

Hymenophyllumdemissum1

Hymenophyllum demissum

The most common of the filmy ferns.

Hymenophyllumdilitatum1copy

Hymenophyllum dilatatum

Hymenophyllumferrugineum249

Hymenophyllum frankliniae

Was H. ferrugineum

The fronds are densely covered with brown stellate hairs.

Hymenophyllumflabellatum82

Hymenophyllum flabellatum

Hymenophyllumflexuosum0307

Hymenophyllum flexuosum

Easily recognised by the broad crinkly wing to the stipe and rachis.

Hymenophyllumscabrum338

Hymenophyllum scabrum

Recognised by the bristles on the stipe as shown in the next image.

Hymenophyllumscabrum340
KidneyFern1

Hymenophyllum nephrophyllum

"Kidney Fern"

Was previously known as Trichomanes reniforme.

However it was decided that the indusia were flaps that were urn-shaped rather than tubular with a wide mouth as the other Trichomanes.

kidneyfern629

This image shows the urcinate (urn-shaped) indusia which covered the developing sporangia.

Trichomaneselongatum100

Trichomanes elongatum

"Bristle fern"

The stalk that bore the sporangia inside the tubular indusia continues to grow after the release of the spores and the fronds develop a bristly look.

Trichomanesvenosum090

Trichomanes venosum

This image clearly shows the tubular indusia that covered the developing sporangia.

Trichomanesvenosum083

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