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Dendrolycopodium hickeyi (W.H.Wagner, Beitel & R.C.Moran) A.Haines   (redirected from: Lycopodium hickeyi W. H. Wagner)
Family: Lycopodiaceae
[Lycopodium hickeyi W. H. Wagner, moreLycopodium obscurum var. isophyllum Hickey]
Dendrolycopodium hickeyi image
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Warren H. Wagner Jr. & Joseph M. Beitel in Flora of North America (vol. 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 X 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 X 2--2.5 mm, apex long, gradually narrowing to tip. 2 n = 68. Mainly in hardwood forests and second-growth, shrubby habitats; 0--1600 m; N.B., 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. 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.

Dendrolycopodium hickeyi
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The PCC, and this data portal, were made possible by funding from the National Science Foundation’s Advancing Digitization of Biological Collections (ADBC) program, grant numbers 1802504, 1802352, 1802134, 1802033, 1802270, 1802255, 1802239, 1802446, 1802305.
The pteridoportal taxonomic thesaurus is based on the Checklist of Ferns and Lycophytes of the World, generously provided by Michael Hassler.