Lycopodium hickeyi

W. H. Wagner

Beitel, & R. C. Moran, Amer. Fern J. 79: 119–121. 1989.

Common names: Hickey's tree club-moss lycopode de Hickey
Synonyms: Lycopodium obscurum var. isophyllum Hickey
Treatment appears in FNA Volume 2.

Horizontal stems subterranean. Upright shoots treelike, many branched, branchlets numerous and strongly differentiated; annual bud constrictions absent; leaves on main axis below lateral branchlets tightly appressed, dark green, needlelike, 3.5–4.5 × 0.5–0.6 mm, soft. Lateral branchlets round in cross-section, 4–7 mm diam.; annual bud constrictions inconspicuous; leaves ascending, in 6 ranks, 1 on upperside, 4 lateral, and 1 on underside, equal in size, linear, widest in middle; margins entire; apex acuminate, lacking hair tip. Strobili sessile, 1–7 per upright shoot, 15–65 mm. Sporophylls 3–3.5 × 2–2.5 mm, apex long, gradually narrowing to tip. 2n = 68.


Habitat: Mainly in hardwood forests and second-growth, shrubby habitats
Elevation: 0–1600 m

Distribution

V2 722-distribution-map.gif

N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Sask., Conn., Ind., Ky., Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., Tenn., Vt., Va., W.Va., Wis.

Discussion

The range of Lycopodium hickeyi overlaps with that of L. obscurum and extends considerably north and west of that species. Although the arrangement of the leaf ranks is similar to that of L. obscurum, the leaf dimorphy and the ascending orientation and absence of twisting of the leaves are diagnostic. Where ranges of two or three species overlap, indivual species retain their identities, indicating that their critical differences have a genetic basis.

Selected References

None.

Lower Taxa

None.

No values specified.

... more about "Lycopodium hickeyi"
acuminate +
narrowing +
Warren H. Wagner Jr. +  and Joseph M. Beitel +
W. H. Wagner +
differentiated +
Hickey's tree club-moss +  and lycopode de Hickey +
N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Conn. +, Ind. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, Tenn. +, Vt. +, Va. +, W.Va. +  and Wis. +
0–1600 m +
photosynthetic +
button--shaped +
Mainly in hardwood forests and second-growth, shrubby habitats +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
pseudomonopodial +, dichotomous +, branching +, branched +  and simple +
flat +  and round +
monomorphic +
not imbricate +
dark green +
remote;dense +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
linear +  and linear-lanceolate +
membranous +
trimorphic +  and uniform +
aerial +  and subterranean +
Beitel, & R. C. Moran, Amer. Fern J. +
1 +  and 6 +
emerging +
0.5 cm5 mm <br />0.005 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
flat +  and round +
plectostelic +  and actino +
axillary +  and adaxial +
thick-walled +  and trilete +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
2mm +  and 2.5mm +
protostelic +
subterranean +
subterranean +
modified +  and unmodified +
photosynthetic +
1.5 cm15 mm <br />0.015 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
small-grooved +
subterranean +
reticulate +, rugulate +  and pitted +
Lycopodium obscurum var. isophyllum +
Lycopodium hickeyi +
Lycopodium +
species +