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FOC | Family List | FOC Vol. 2-3 | Ophioglossaceae

3. Ophioglossum Linnaeus, Sp. Pl. 2: 1062. 1753.

瓶尔小草属 ping er xiao cao shu

Authors: Quanru Liu & Norio Sahashi

Ophioglossum petiolatum

Credit: Harvard University Herbaria

Ophioderma Blume.

Plants terrestrial, rarely epiphytic, generally small, erect, rarely large and pendulous. Rhizome erect, rarely creeping, short, glabrous or long hairy. Fronds often solitary, occasionally 2, rarely more; sterile lamina with stipe, usually simple, lanceolate, ovate, or ribbon-shaped, rarely dichotomously divided, with entire or wavy margin; midrib indistinct; veins reticulate; sporophore arising from base, near base, or middle part of sterile lamina, with long stalk. Sporangia embedded in 2 rows along margin of linear spike; spore surface irregularly reticulate, foveolate, or subsmooth.

About 28 species: mainly in the N Hemisphere; nine species (two endemic) in China.

1 Plants epiphytic; sterile lamina large, ribbon-shaped, pendulous; rhizome with long hairs; sporophore arising from near base or middle part of sterile lamina.   1 O. pendulum
+ Plants terrestrial; sterile lamina small, ovate or lanceolate, erect; rhizome glabrous; sporophore arising from base of sterile lamina   (2)
2 (1) Plants usually 2-10 cm tall; sterile lamina usually less than 3 cm   (3)
+ Plants more than 10 cm tall, sometimes up to 35 cm; sterile lamina more than 3 cm   (4)
3 (2) Fronds consisting of sterile and fertile portions; sterile lamina elliptic or elliptic-ovate; spike bearing 10-18 pairs of sporangia.   8 O. nudicaule
+ Fronds usually consisting of sporophore only, or rarely with both sterile and fertile portions; sterile lamina elliptic or ovate-rhombic; spike bearing 3-12 pairs of sporangia.   9 O. yongrenense
4 (2) Sterile lamina cordate at base; margin ?wavy; areoles of veins evident   (5)
+ Sterile lamina not cordate at base; margin entire   (6)
5 (4) Spores coarsely reticulate.   5 O. austroasiaticum
+ Spores subreticulate.   6 O. reticulatum
6 (4) Sterile lamina narrow, lanceolate or oblanceolate, narrowly cuneate at base.   7 O. thermale
+ Sterile lamina broad, oblong to ovate, broadly cuneate, truncate, or rounded at base   (7)
7 (6) Sterile lamina oblong, rounded at apex.   4 O. oblongum
+ Sterile lamina elliptic or narrowly to broadly ovate, rounded or acute at apex   (8)
8 (7) Sterile lamina elliptic or narrowly ovate, 6-10 cm or longer.   2 O. vulgatum
+ Sterile lamina ovate to broadly ovate, 3-6 cm.   3 O. petiolatum

Lower Taxa


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