Pteridophytes (Spore Producing Plants: Ferns and More) • Earth.com

Hymenophyllum flabellatum

(Hymenophyllum flabellatum)

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Description

Hymenophyllum flabellatum Hymen-O-FIL-lum Flab-bel-Lah-tum, the shiny filmy-fern, is a species of fern in the family Hymenophyllaceae.The filmy-fern is distinct by its thin, one cell thick, membranous fronds, that grow in moist areas. Fronds are pale yellow green, covered in yellow-brown hairs, and 5–25 cm in length. Linear with entire margins, terminal on short lateral segments, with one singular vein in lateral segment; Sori numerous and present at tips of lateral segments see image below; indusium two lipped, slightly wider than segment; fronds usually distant and often pendant.Stomata are absent. Lamina is 2-3 pinnate, ovate to linear, and yellow green; pinnae sometimes with long terminal segments commonly referred to as "tailed", narrowly rhomboidal, to fan-shaped; stipe slender and not winged, with tuft of hairs at base; rachis bearing scattered hairs, winged towards upper parts; receptical short and enclosed.

Taxonomic tree:

Domain:
Kingdom: Plantae
Phylum:
Class: Polypodiopsida
Order:Hymenophyllales
Family:Hymenophyllaceae
Genus:Hymenophyllum
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