Pacific Island Ecosystems at Risk (PIER)

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Cyathea australis
(R.Br.) Domin, Cyatheaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  Evaluate, score: 5 (Go to the risk assessment)

Other Latin names:  Alsophila australis R. Br.

Common name(s): [more details]

English: black tree-fern, rough tree fern

Habit:  fern

Description:  "Rhizome to c. 12 m tall, 15-40 cm in diameter, sometimes up to 1.5 m at base. Stipe to 80 cm long; stipe bases with conical spines to 3 mm long, covered with glossy brown scales; scales 2-5 cm long, 1.2-5 mm wide at base, with narrow fragile margins and an apical seta. Lamina to 3.5 m long; largest pinnae c. 50 cm long; a few pairs of lower pinnae progressively reduced, extending sometimes nearly to the base of the stipe (most commonly in Queensland); pinnules 10-12 cm long, to 2.5 cm wide, with 1 or more pairs of lobes near base separately attached to costa; lobes ± crenate, some lower ones deeply so; veins mostly forked; larger costal scales flat, elongate, brownish, grading to thin flat ± hyaline scales and to small bullate pale tan scales with setose apices; slender crinkled hairs present on costae and costules. Sori at the forks of veins, exindusiate, with irregularly-shaped small scales around receptacle; paraphyses ±same length as sporangia"  (Flora of Australia online).

Habitat/ecology:  In Australia (native), "in northern areas to 1200 m alt. Grows in forest or along forest margins, often very abundant"  (Flora of Australia online).

Propagation:  Wind-dispersed spores.

Native range:  Australia; also cultivated (GRIN).  Norfolk Island (subsp. norfolkensis) (Flora of Australia online).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Australia (Pacific offshore islands)
Norfolk Islands
Norfolk Island native
Australian Biological Resources Study (2013)
subsp. norfolkensis Holttum
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island   Bishop Museum (U.S.A. Hawaii. Honolulu.) (1990) (voucher ID: BISH 599938)
Taxon name on voucher: Cyathea australis (R.Br.) Domin
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Australia
Australia (continental)
Australia (continental) native
Australian Biological Resources Study (2013)
ACT, Tasmania, Victoria
Australia
Australia (continental)
New South Wales native
Australian Biological Resources Study (2013)
Australia
Australia (continental)
Queensland native
Australian Biological Resources Study (2013)


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

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This page was created on 1 FEB 2013 and was last updated on 10 FEB 2013.