Pacific Island Ecosystems at Risk (PIER)

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Pyrrosia piloselloides
(L.) Presl, Polypodiaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  High risk, score: 6 (Go to the risk assessment)

Other Latin names:  Drymoglossum piloselloides (L.) C. Presl; Pteris piloselloides L.

Habit:  fern

Description:  "Rhizome shortly elongated, not grooved ventrally, 4-4.5 mm thick, phyllopodia to 1-2 cm apart, lateral buds situated on the phyllopodia.  Anatomy: ground tissue sclerenchymatous, sclerenchyma sheath and sclerenchyma strands absent; vascular strands 9-11.  Scales basifix, 3-10 mm long, base often ciliate, with several stalked marginal glands; acumen brown, entire, shorter scales interspersed with he larger ones present.  Fronds monomorphic, not or indistinctly stipitate; stipes up to 13 cm; lamina, index 7-20; widest above the middle, 26-111 x 2.5-7.3 (-10) cm, base very gradually narrowed, apex acuminate.  Venation:  secondary veins distinct, with the tertiary veins forming regular areoles; included veins much branched and strongly anastomosing; free veins many, pointing to all directions.  Hydathodes distinct, scattered over the lamina, ± superficial.  Anatomy:  stipe or lower part of costa with central bundle of collenchyma and 7-8 central and 3-5 lateral vascular strands; lamina ± 0.3 mm thick, upper epidermis with flat cells with thickened walls, hypodermis composed of a single cell layer, water-tissue absent, palissade and spongy parenchyma little different, lower epidermis with thickened cell walls, stomata superficial, pericytic.  Indument dimorphic, a dense mat, persistent, greyish brown; upper layer composed of hairs 0.4-1.9 mm in diameter, with appressed, narrowly boat-shaped to acicular rays, appressed to a lower layer composed of hairs with mainly woolly rays.  Seri apical, in a more or less sharply defined patch, closely packed, superficial; many irregularly scattered through each soriferous areole, situated on short side branches of the included veins, not confluent; * 0.5 mm in diameter; developing from the apex downwards, when old individually distinct, exserted from the indument.  Sporangia sessile or on stalks up to 1/4 x as long as the capsule, capsule 0.3-0.4 mm high, with 12-14 indurated annulus cells.  Paraphyses not differentiated.  Spores (52-) 59.2-63.6 (-68) x (28-) 34.4-39.0 (-40) µm, smooth"  (Hovenkamp, 1986; p. 222).

Habitat/ecology:  "Epiphytic (to 40 m high) or epilithic, preferentially on limestone.  Sea level to 600 m"  (Hovenkamp, 1986; p. 222).

Propagation:  Spores

Native range:  India, southern China, southeast Asia (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Lau, Alex/Frohlich, Danielle (2012) (p. 21)
Voucher cited: OED 2008101703 (BISH)
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Cambodia
Cambodia
Cambodia (Kingdom of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
China
China
China (People's Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Indonesia
Indonesia
Indonesia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Malaysia
Malaysia
Malaysia (country of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Singapore
Singapore
Singapore (Republic of) native
Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 74)
Common
Thailand
Thailand
Thailand (Kingdom of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Vietnam
Vietnam
Vietnam (Socialist Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)


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

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This page was created on 24 APR 2010 and was last updated on 7 JUL 2012.