Seeds of South Australia
Blechnum nudum (Blechnaceae)
Fishbone Water-fern
List of species for Blechnum
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Herbarium regions:
Southern Lofty, Kangaroo Island
NRM regions:
Adelaide and Mount Lofty Ranges, Kangaroo Island
IBRA regions
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [decline outside parks, conserved pops ok; herbicide run-off a threat on private property]
Fleurieu (KAN02) 
 Rare   (IUCN: RA d(ii))   [localised; tolerates dry periods; some pops have gone; weeds (blackberry) a threat; recolonises after weed management]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [localised; tolerates dry periods; some pops have gone; weeds (blackberry) a threat; recolonises after weed management]
RSCA map:
Regional Species Conservation Assessments per IBRA subregion. Please click the thumbnail map.
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Blechnum]
Name derivation:
Blechnum from the Greek 'blechnon', the name for ferns in general. Nudum from Latin meaning naked.
Distribution:
Found on Kangaroo Island and southern Mount Lofty Ranges in South Australia, growing along stream banks in shaded gullies. Also found in Queensland, New South Wales, Victoria and Tasmania. 
Status:
Native. Uncommon in South Australia. Common in the other states.
Plant description:
Erect fern to 1 m tall with short trunk and short rhizome. Fronds to 60 cm long and are clustered near the tip of the rhizome, with a short, thick, black and shinny stem that is covered with long, dark, shiny scales. The lamina of the frond is divided into pinnae which are longer near the centre of the frond, diminishing in size toward both the tip and base. There are distinct fertile and sterile fronds. The sterile fronds are usually longer and considerably broader than the fertile fronds and are mid-green on the upper surface and paler below, while young fronds are yellow-green.
Fruit type:
Dark brown sori along the edge on the underside of the fronds.
Seed type:
Ripe spores are dark brown or black.
Seed collecting:
Collect fronds containing sori.
Seed cleaning:
Shake fronds to dislodge the spores onto a clean piece of paper. Store spores in liquid nitrogen.