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NZ Plants

Blechnum chambersii - nini, reteti

Hard fern family: Blechnaceae

Blechnum chambersii has a stout, erect stem with dissimilar sterile and fertile fronds (dimorphic).
The sterile fronds have bluntly pointed leaflets that are longest at the middle of the frond.
Found throughout New Zealand in damp places.

Vegetative characteristics

Fertile frond and sporangia

Plant form: a short, erect trunk with fronds up to 500 mm long

Frond appearance: slightly shorter and more narrow than sterile fronds, with very narrow leaflets

Frond stalk, midrib: scales linear to lanceolate

Sporangium location: on lower frond surface

Sterile frond shape: narrow to linear

Sporangium position: leaflet margin

Frond blade: pinnate (divided 1 x into leaflets or pinnae)

Sporangium distribution: in groups (sori)

Frond surface: leathery

Sorus shape: in a continuous line either side of midrib

Leaflets: longest at middle of frond; oblong, slightly serrate margins and blunt to pointed tip; attached along leaflet base (adnate)

Sorus covering: linear, opening toward midrib