Hymenophyllum tunbrigense

(Linnaeus) Smith in J. E. Smith et al.

5: 418. 1793.

Common names: Tunbridge filmy fern
Illustrated
Basionym: Trichomanes tunbrigense Linnaeus Sp. Pl. 2: 1098. 1753
Treatment appears in FNA Volume 2.

Plants on rock. Leaves oblong, 2–3-pinnatifid, 2–6 × 0.5–1.5 cm, with minute, 2-celled, glandular-hairs scattered on veins; margins distantly dentate. Gametophyte gemmae absent. 2n = 26.


Habitat: On rock, forming imbricate mats on vertical cliffs in narrow gorges usually near waterfalls and cascades
Elevation: 350–500 m

Distribution

V2 200-distribution-map.gif

S.C., Mexico, West Indies, Central America, South America, Europe, Asia, in tropical and temperate regions

Discussion

About two dozen small populations of Hymenophyllum tunbrigense exist in a single river gorge in Pickens County, South Carolina. It is slow to recover from disturbance, and its numbers have been substantially reduced by collecting since its initial discovery in 1936. Gametophytes characteristic of the genus but lacking gemmae have been described from Great Britain, where populations are more vigorous and where spore production and sexual reproduction via gametophytes are more common (F. J. Rumsey et al. 1990; C. A. Raine et al. 1991). In plants in the flora, spore production is relatively rare, and gametophytes have not been observed.

Selected References

None.

Lower Taxa

None.

"entire" is not a number.

... more about "Hymenophyllum tunbrigense"
Donald R. Farrar +
(Linnaeus) Smith in J. E. Smith et al. +
Trichomanes tunbrigense +
simple;decompound +
oblong;lanceolate +
dentate +  and entire +
Tunbridge filmy fern +
S.C. +, Mexico +, West Indies +, Central America +, South America +, Europe +, Asia +  and in tropical and temperate regions +
350–500 m +
On rock, forming imbricate mats on vertical cliffs in narrow gorges usually near waterfalls and cascades +
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
2-3-pinnatifid;oblong +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
thread-like +
Illustrated +
short-stalked +  and sessile +
globose +
protostelic +
short-erect +
thread-like +
Hymenophyllum tunbrigense +
Hymenophyllum +
species +
1 +  and 2 +
on rock +  and epiphytic +