Taxon Details: Elaphoglossum nervosum (Bory) Christ
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Elaphoglossum nervosum, link to GenBank sequence data
Elaphoglossum nervosum, link to GenBank sequence dataFamily:
Dryopteridaceae (Pteridophyta)
Dryopteridaceae (Pteridophyta)
Scientific Name:
Elaphoglossum nervosum (Bory) Christ
Elaphoglossum nervosum (Bory) Christ
Primary Citation:
Monogr. Elaphoglossum 36: 50, fig. 13. 1899
Monogr. Elaphoglossum 36: 50, fig. 13. 1899
Accepted Name:
This name is currently accepted.
This name is currently accepted.
Description:
by: A. Vasco, R.C. Moran, and G. Rouhan
Type: St. Helena. D. D'Urville s.n. (holotype: P, 2 sheets, one sheet a mixed collection)
Description: Epiphytic or rarely saxicolous. Rhizome 2-4 mm wide, short-creeping, scaly, black, often resinous; scales 2-4.5 mm long, lanceolate, light brown, subentire, apies acute. Sterile leaves 12-25 cm long, 1-2 mm apart; phyllopodia indistinct; petioles 1/3-1/2 the length of the sterile lamina, brown; scales reduced to resinous dots or spreading, lighter and sometimes narrower than those of the rhizomes; laminae 8-12 x 2-3 cm, lanceolate to narrowly elliptic, papyraceous to chartaceous, the base cuneate, ending well above the phylopodia, the apex acute; veins conspicuous, prominent, with a marginal collecting vein, 1-1.5 mm apart, at a angle of 70° with respect to the costa, the apices free; hydathodes absent; lamina scales present on both surfaces (some of them reduced to resinous dots), those on the abaxial surface present only on the costa, 0.5-1 mm long, lanceolate, tan, entire; those on the adaxial surface, ca. 0.4-0.6 mm long, circular to ovate, appressed, thin, pale whitish, subentire. Fertile leaves not seen, but in the figure in the A. subdiaphanum protologue they are longer and narrower than the sterile frond.
Distribution: Endemic to St. Helena Island, above 750 m (elevation according to Eastwood et al., 2004b)
Comments: Elaphoglossum nervosum can be distinguished from all others in the ciliatum-group by its prominent lateral veins and submarginal connecting vein. Presumably the syntype of Acrostichum subdiaphanum from Madras, India, represents a label mix-up.
Status: This species has been classified as class endangered by the IUCN (Eastwood, 2004)
by: A. Vasco, R.C. Moran, and G. Rouhan
Type: St. Helena. D. D'Urville s.n. (holotype: P, 2 sheets, one sheet a mixed collection)
Description: Epiphytic or rarely saxicolous. Rhizome 2-4 mm wide, short-creeping, scaly, black, often resinous; scales 2-4.5 mm long, lanceolate, light brown, subentire, apies acute. Sterile leaves 12-25 cm long, 1-2 mm apart; phyllopodia indistinct; petioles 1/3-1/2 the length of the sterile lamina, brown; scales reduced to resinous dots or spreading, lighter and sometimes narrower than those of the rhizomes; laminae 8-12 x 2-3 cm, lanceolate to narrowly elliptic, papyraceous to chartaceous, the base cuneate, ending well above the phylopodia, the apex acute; veins conspicuous, prominent, with a marginal collecting vein, 1-1.5 mm apart, at a angle of 70° with respect to the costa, the apices free; hydathodes absent; lamina scales present on both surfaces (some of them reduced to resinous dots), those on the abaxial surface present only on the costa, 0.5-1 mm long, lanceolate, tan, entire; those on the adaxial surface, ca. 0.4-0.6 mm long, circular to ovate, appressed, thin, pale whitish, subentire. Fertile leaves not seen, but in the figure in the A. subdiaphanum protologue they are longer and narrower than the sterile frond.
Distribution: Endemic to St. Helena Island, above 750 m (elevation according to Eastwood et al., 2004b)
Comments: Elaphoglossum nervosum can be distinguished from all others in the ciliatum-group by its prominent lateral veins and submarginal connecting vein. Presumably the syntype of Acrostichum subdiaphanum from Madras, India, represents a label mix-up.
Status: This species has been classified as class endangered by the IUCN (Eastwood, 2004)