Blechnum nudum Mett.

Fishbone Water Fern

Rhizome short, erect, thick, eventually forming a small trunk. Sterile and fertile fronds different. Fronds erect or spreading, undersurface pale or sometimes waxy blue; margins entire. Sterile fronds to about 50 cm long, 8 cm wide, linear to elliptic in outline, forming clumps, tips of lowermost segments rounded. Fertile fronds stiff, the lower segments having leafy bases. Stalks purple-black.

Will tolerate cool conditions. Forms with the segments subdivided or crested occur both in nature and cultivation.

SA, Qld, NSW, Vic., Tas.

Segments more or less at right angles to the axis, the tips pointed; stalk thick, shiny, black; cf. B. gibbum.

Source: Spencer, R. (1995). Blechnaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 1, Ferns, conifers & their allies. The identification of garden and cultivated plants. University of New South Wales Press.

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Distribution map
kingdom Plantae
phylum   Tracheophyta
class    Polypodiopsida
order     Polypodiales
family      Blechnaceae
genus       Blechnum L.