Ophioglossum vulgatum


Sp. Pl. 2: 1062. 1753.

Common names: Southern adder's-tongue herbe sans couture
Synonyms: Ophioglossum pycnostichum (Fernald) A.Löve & D.Löve Ophioglossum vulgatum var. pycnostichum Fernald
Treatment appears in FNA Volume 2.

Roots to 20 per plant, 0.3-0.9 mm diam., producing proliferations. Stem upright, to 1 cm, 3 mm diam., leaves 1 per stem. Trophophore stalk formed abruptly at base, to 5mm, sometimes more, 0.05 times length of trophophore blade. Trophophore blade erect to spreading, usually plane when alive, dark green, somewhat shiny, mostly ovate to ovate-trowel-shaped, widest in proximal half, to 10 × 4cm, firm, herbaceous, base tapering abruptly, apex rounded; venation complex-reticulate with included free veinlets in areoles. Sporophores arising at ground level, stalk 2-4 times length of trophophore; sporangial clusters 20-40 × 1-4 mm, with 10-35 pairs of sporangia, apiculum 1-1.5mm. 2n =ca.1320.

Phenology: Leaves appearing spring–early summer.
Habitat: Shaded secondary woods, rich wooded slopes, forested bottomlands, and floodplain woods, south of Wisconsin glaciation
Elevation: 0-800m


V2 106-distribution-map.gif

Ala., Ariz., Ark., Del., Fla., Ga., Ill., Ind., Ky., La., Mich., Miss., Mo., N.J., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., Va., W.Va., Mexico, Eurasia.


In addition to characteristics given in the key, Ophioglossum vulgatum differs from O. pusillum in having an unusually persistent leathery basal leaf sheath (B.W. McAlpin 1971; W.H. Wagner Jr. 1971b) rather than an ephemeral one and in having smaller spores (mostly 35-45µm in O. vulgatum compared with 50-60 µm in O. pusillum). The chromosome number of O. vulgatum in India and Europe has been reported as 2n =480, and that may be the number of most North America populations, which are small spored. In the Appalachians, however, a distinctive large-spored form has a chromosome number of 2n =ca. 1320.

Selected References


Lower Taxa

... more about "Ophioglossum vulgatum"
Warren H. Wagner Jr. +  and Florence S. Wagner +
Linnaeus +
Southern adder's-tongue +  and herbe sans couture +
Ala. +, Ariz. +, Ark. +, Del. +, Fla. +, Ga. +, Ill. +, Ind. +, Ky. +, La. +, Mich. +, Miss. +, Mo. +, N.J. +, N.C. +, Ohio +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +, Va. +, W.Va. +, Mexico +  and Eurasia. +
0-800m +
Shaded secondary woods, rich wooded slopes, forested bottomlands, and floodplain woods, south of Wisconsin glaciation +
Leaves appearing spring–early summer. +
Illustrated +
Ophioglossum pycnostichum +  and Ophioglossum vulgatum var. pycnostichum +
Ophioglossum vulgatum +
Ophioglossum +
species +