Dendrolycopodium hickeyi

Dendrolycopodium hickeyi, synonym Lycopodium hickeyi, known as Hickey's tree club-moss[1] or Pennsylvania clubmoss,[2] is a North American species of clubmoss in the family Lycopodiaceae. It is native to eastern and Central Canada (from Newfoundland to Ontario with isolated populations in Saskatchewan) and the eastern and north-central United States (from Maine west to Minnesota and south as far as Tennessee and North Carolina).[3] The genus Dendrolycopodium is accepted in the Pteridophyte Phylogeny Group classification of 2016 (PPG I),[4] but not in other classifications, which submerge the genus in Lycopodium.[5]

Dendrolycopodium hickeyi
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Lycophytes
Class: Lycopodiopsida
Order: Lycopodiales
Family: Lycopodiaceae
Genus: Dendrolycopodium
Species:
D. hickeyi
Binomial name
Dendrolycopodium hickeyi
(W.H.Wagner, Beitel & R.C.Moran) A.Haines
Synonyms
  • Lycopodium hickeyi W.H.Wagner, Beitel & R.C.Moran
  • Lycopodium obscurum var. isophyllum Hickey

Dendrolycopodium hickeyi is very similar to D. obscurum except for a few minor but consistent features: side shoots round rather than flat in cross section, leaves all the same size.[1]

The oldest name for the taxon is Lycopodium obscurum var. isophyllum.[6][7] In elevating the plants from varietal level to species level, Wagner et al. opted to forgo the common (but not mandatory) custom of using the old varietal epithet as the new species epithet. They chose instead the name Lycopodium hickeyi while acknowledging the old varietal name as synonym.[8]

References
  1. Flora of North America, Lycopodium hickeyi W. H. Wagner, Beitel, & R. C. Moran, 1989. Hickey's tree club-moss, lycopode de Hickey
  2. "Lycopodium hickeyi". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 27 July 2015.
  3. Biota of North America Program 2014 state-level distribution map, Dendrolycopodium hickeyi
  4. PPG I (2016). "A community-derived classification for extant lycophytes and ferns". Journal of Systematics and Evolution. 54 (6): 563–603. doi:10.1111/jse.12229. S2CID 39980610.
  5. Christenhusz, Maarten J.M. & Chase, Mark W. (2014). "Trends and concepts in fern classification". Annals of Botany. 113 (9): 571–594. doi:10.1093/aob/mct299. PMC 3936591. PMID 24532607.
  6. Hickey, Ralph James. 1977. American Fern Journal 67: 47-48 diagnosis in Latin, description and figure captions in English
  7. Hickey, Ralph James. 1977. American Fern Journal 67: 46 line drawings, figures 4-6 in center
  8. Wagner, Warren Herbert, Beitel, Joseph M., & Moran, Robbin Craig. 1989. American Fern Journal 79: 119–121


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