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NZ Plants

Hymenophyllum flabellatum

Filmy fern family: Hymenophyllaceae

Hymenophyllum flabellatum is terrestrial or epiphytic filmy fern with long-creeping stems (rhizomes) bearing yellow-green pendulous fronds often with the lower segments at right angles to the rest of the frond.
Found throughout New Zealand.

Vegetative characteristics

Fertile frond and sporangia

Plant form: creeping rhizome with fronds up to 30 cm

Frond appearance: similar to sterile frond

Frond stalk, midrib: stalk wiry, with yellow hairs

Sporangium location: on terminal ends of leaflets

Frond shape: oval when small; lanceolate when large

Sporangium position: leaflet margin

Frond blade: 2-3-pinnate (divided 2-3 times into leaflets or pinnae)

Sporangia distribution: in groups (sori)

Frond surface:

Sorus shape: rounded

Leaflets: oblong, smooth margin


Juvenile characteristics:

Sorus covering: indusium flaps oval,  smooth-edged and single