Dendrolycopodium hickeyi

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Dendrolycopodium hickeyi
Lycopodium hickeyi.JPG
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Lycophytes
Class: Lycopodiopsida
Order: Lycopodiales
Family: Lycopodiaceae
Genus: Dendrolycopodium
Species:
D. hickeyi
Binomial name
Dendrolycopodium hickeyi
Synonyms
  • Lycopodium hickeyiW.H.Wagner, Beitel & R.C.Moran
  • Lycopodium obscurum var. isophyllumHickey

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 a larger Lycopodium . [5]

Contents

Description

Similar to other members of the genus, the sporophyte of Dendrolycopodium hickeyi resembles the seedlings of some conifers. The upright sporophytes grow from subterranean horizontal stems, often causing tree club-mosses to be found in clusters. [6] [7] The upright sporophytes have small, green microphylls (leaves) extending from the ground to the tips of their branches (branches 4–7mm in diameter). [6] These plants remain green throughout the winter and in their final year, they produce usually a single, unstalked (sessile) terminal strobilus from which spores are released.

Identification

Dendrolycopodium hickeyi is ostensibly very similar to D. obscurum which overlaps with D. hickeyi in range. While D. obscurum has reduced leaves on the underside of the branches, D. hickeyi has leaves of equal length around the branches [6] [8] [7] (as reflected by its former name, Lycopodium obscurum var. isophyllum: [9] iso- [“equal”] + -phyllum [“leaf”]). D. hickeyi can be distinguished from D. dendroideum, which also has leaves of equal length around their branches, by the orientation of these leaves. D. hickeyi and D. obscurum both have a single rank of leaves on the top of the branches while D. dendroideum has leaves in ranks of two on the top of each branch. D. hickeyi also has leaves which are appressed to the stem below the first branches (unlike spreading leaves in D. dendroideum). The strobilus of D. hickeyi is also intermediate in length between D. obscurum and D. dendroideum. [6] [7]

Taxonomy

The oldest name for the taxon is Lycopodium obscurum var. isophyllum. [9] [10] 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 since D. hickeyi and D. dendroideum both have leaves of equal length around the branches. They chose instead the name Lycopodium hickeyi in honor of the pteridologist James Hickey who originally described the plant as L. obscurum var. isophyllum. [8]

Related Research Articles

<span class="mw-page-title-main">Lycopodiopsida</span> Class of vascular plants

Lycopodiopsida is a class of vascular plants known as lycopods, lycophytes or other terms including the component lyco-. Members of the class are also called clubmosses, firmosses, spikemosses and quillworts. They have dichotomously branching stems bearing simple leaves called microphylls and reproduce by means of spores borne in sporangia on the sides of the stems at the bases of the leaves. Although living species are small, during the Carboniferous, extinct tree-like forms (Lepidodendrales) formed huge forests that dominated the landscape and contributed to coal deposits.

<i>Huperzia</i> Genus of vascular plants in the clubmoss family Lycopodiaceae

Huperzia is a genus of lycophyte plants, sometimes known as the firmosses or fir clubmosses; the Flora of North America calls them gemma fir-mosses. This genus was originally included in the related genus Lycopodium, from which it differs in having undifferentiated sporangial leaves, and the sporangia not formed into apical cones. The common name firmoss, used for some of the north temperate species, refers to their superficial resemblance to branches of fir (Abies), a conifer. As of 2020, two very different circumscriptions of the genus were in use. In the Pteridophyte Phylogeny Group classification of 2016, Huperzia is one of three genera in the subfamily Huperzioideae of the family Lycopodiaceae. Most species in the subfamily are placed in the genus Phlegmariurus. Huperzia is left with about 25 species, although not all have been formally transferred to other genera. Other sources recognize only Huperzia, which then has about 340 species.

<span class="mw-page-title-main">Lycopodiaceae</span> Family of vascular plants

The Lycopodiaceae are an old family of vascular plants, including all of the core clubmosses and firmosses, comprising 16 accepted genera and about 400 known species. This family originated about 380 million years ago in the early Devonian, though the diversity within the family has been much more recent. "Wolf foot" is another common name for this family due to the resemblance of either the roots or branch tips to a wolf's paw.

<i>Lycopodium</i> Genus of vascular plants in the family Lycopodiaceae

Lycopodium is a genus of clubmosses, also known as ground pines or creeping cedars, in the family Lycopodiaceae. Two very different circumscriptions of the genus are in use. In the Pteridophyte Phylogeny Group classification of 2016, Lycopodium is one of nine genera in the subfamily Lycopodioideae, and has from nine to 15 species. In other classifications, the genus is equivalent to the whole of the subfamily, since it includes all of the other genera. More than 40 species are accepted.

<i>Lycopodium clavatum</i> Species of vascular plant in the family Lycopodiaceae

Lycopodium clavatum is the most widespread species in the genus Lycopodium in the clubmoss family.

<i>Lycopodiella</i> Genus of spore-bearing plants

Lycopodiella is a genus in the clubmoss family Lycopodiaceae. The genus members are commonly called bog clubmosses, describing their wetland habitat. The genus has a cosmopolitan distribution, with centers of diversity in the tropical New World and New Guinea. In the past, the genus was often incorporated within the related genus Lycopodium, but was segregated in 1964. In the Pteridophyte Phylogeny Group classification of 2016, Lycopodiella is placed in the subfamily Lycopodielloideae, along with three other genera. In this circumscription, the genus has about 15 species. Other sources use a wider circumscription, in which the genus is equivalent to the Lycopodielloideae of PPG I, in which case about 40 species and hybrids are accepted.

Ground pine or ground-pine may refer to:

<i>Selaginella apoda</i> Species of spore-bearing plant

Selaginella apoda, commonly known as meadow spikemoss, is a perennial lycophyte native to much of the eastern United States and parts of northeastern Mexico. The life cycle is the shortest of the genus Selaginella, as well as one of the shortest among the lycophytes. Selaginella apoda is found primarily in damp soils in habitats such as swamps, wet fields, open woods and along stream banks. Selaginella apoda presents the potential for case studies involving the plant's adaptability to environmental toxins. A lowland plant, it has only been recorded at elevations below 100 meters. It is closely related to Selaginella eclipes and S. ludoviciana, with both of which it has been reported to form hybrids. This group is characterized by relatively flat strobili and large megasporophylls which occur in the same plane as the lateral leaves.

<i>Spinulum annotinum</i> Species of clubmoss in the family Lycopodiaceae

Spinulum annotinum, synonym Lycopodium annotinum, known as interrupted club-moss, or stiff clubmoss, is a species of clubmoss native to forests of the colder parts of North America, as well as Asia, and most of Europe. The genus Spinulum is accepted in the Pteridophyte Phylogeny Group classification of 2016, but not in other classifications, which submerge the genus in Lycopodium.

<i>Lycopodiella inundata</i> Species of spore-bearing plant

Lycopodiella inundata is a species of club moss known by the common names inundated club moss, marsh clubmoss and northern bog club moss. It has a circumpolar and circumboreal distribution, occurring throughout the northern Northern Hemisphere from the Arctic to montane temperate regions in Eurasia and North America. It grows in wet habitat, such as bogs, ponds, moist spots on the tundra, and long-standing borrow pits.

<i>Dendrolycopodium dendroideum</i> Species of spore-bearing plant

Dendrolycopodium dendroideum, synonym Lycopodium dendroideum, known as tree groundpine, is a North American species of clubmoss. It is part of a complex of species colloquially known as groundpine, which taxa were formerly lumped into the species Lycopodium obscurum. The species is native to Russia and also to the colder parts of North America. The genus Dendrolycopodium is accepted in the Pteridophyte Phylogeny Group classification of 2016, but not in other classifications, which submerge the genus in Lycopodium.

<i>Palhinhaea cernua</i> Species of plant

Palhinhaea cernua, synonym Lycopodiella cernua, is a plant in the family Lycopodiaceae, commonly known as the staghorn clubmoss. The Hawaiian name for the plant is wāwaeʻiole, or "rat's foot". It has a substantial number of scientific synonyms in several genera. The genus Palhinhaea is accepted in the Pteridophyte Phylogeny Group classification of 2016, but not in other classifications which submerge the genus in Lycopodiella.

<i>Dendrolycopodium</i> Genus of spore-bearing plants

The genus Dendrolycopodium is a clubmoss genus in the family Lycopodiaceae. In the Pteridophyte Phylogeny Group classification of 2016, it is placed in the subfamily Lycopodioideae. Some sources do not recognize the genus, sinking it into Lycopodium. It is treated as section Obscura when retained within Lycopodium. The genus includes a discrete group of plants with similar morphologies. All have erect to semi-erect, branched stems.

<i>Dendrolycopodium obscurum</i> Species of spore-bearing plant

Dendrolycopodium obscurum, synonym Lycopodium obscurum, commonly called rare clubmoss, ground pine, or princess pine, is a North American species of clubmoss in the family Lycopodiaceae. It is a close relative of other species such as D. dendroideum and D. hickeyi, also treelike. It is native to the eastern United States and southeastern Canada from Georgia to Minnesota to Nova Scotia. It grows in the understory of temperate coniferous and deciduous forests, where it is involved in seral secondary succession, growing in clonal colonies some years after disturbance has occurred. It has also been found in Japan, Taiwan, Korea, Russian Far East, and northeastern China.

<i>Austrolycopodium fastigiatum</i> Species of spore-bearing plant

Austrolycopodium fastigiatum, synonym Lycopodium fastigiatum, commonly known as alpine club moss or mountain club moss, is a species of club moss native to New Zealand and Australia. The genus Austrolycopodium is accepted in the Pteridophyte Phylogeny Group classification of 2016, but not in other classifications which submerge the genus in Lycopodium.

<i>Diphasium scariosum</i> Species of spore-bearing plant

Diphasium scariosum, synonym Lycopodium scariosum, commonly known as spreading clubmoss or creeping club moss, is a species in the club moss family Lycopodiaceae. The genus Diphasium is accepted in the Pteridophyte Phylogeny Group classification of 2016, but not in other classifications which submerge the genus in Lycopodium. D. scariosum is native to Australia, New Zealand, and Borneo.

<i>Diphasiastrum tristachyum</i> Species of spore-bearing plant

Diphasiastrum tristachyum, commonly known as blue clubmoss, blue ground-cedar, ground pine, deep-rooted running-pine or ground cedar, is a North American and Eurasian species of clubmoss. In North America, it has been found from Newfoundland west to Manitoba, and south as far as Georgia and Alabama. In Eurasia, it ranges from southern Norway and Sweden south to France and Italy and it also occurs in the Caucasus.

<i>Lycopodiella alopecuroides</i> Species of spore-bearing plant

Lycopodiella alopecuroides, the foxtail clubmoss, is a species of perennial vascular plant in the club-moss family, Lycopodiaceae. It is commonly found along the Atlantic seaboard and has been recently been discovered in the state of Maine. The family, Lycopodiaceae contains nearly 15 genera and about 375 species

<span class="mw-page-title-main">Lycopodioideae</span> Subfamily of spore-bearing plants

Lycopodioideae is a subfamily in the family Lycopodiaceae in the Pteridophyte Phylogeny Group classification of 2016. It is equivalent to a broad circumscription of the genus Lycopodium in other classifications. Like all lycophytes, members of the Lycopodioideae reproduce by spores. The oldest fossils of modern members of the family date to the Early Cretaceous.

<span class="mw-page-title-main">Lycopodielloideae</span> Subfamily of plants

Lycopodielloideae is a subfamily in the family Lycopodiaceae in the Pteridophyte Phylogeny Group classification of 2016. It is equivalent to a broad circumscription of the genus Lycopodiella in other classifications. Like all lycophytes, members of the Lycopodielloideae are vascular plants that reproduce by spores.

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. USDA, NRCS (n.d.). "Lycopodium hickeyi". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. 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. 1 2 3 4 "Lycopodium hickeyi - FNA". floranorthamerica.org. Retrieved 2022-12-03.
  7. 1 2 3 Cobb, Boughton; Farnsworth, Elizabeth; Lowe, Cheryl (2005). A field guide to ferns and their related families : northeastern and central North America (2nd ed.). Boston: Houghton Mifflin Co. ISBN   0-618-39406-0. OCLC   57613548.
  8. 1 2 Wagner, Warren Herbert, Beitel, Joseph M., & Moran, Robbin Craig. 1989. American Fern Journal 79: 119–121
  9. 1 2 Hickey, Ralph James. 1977. American Fern Journal 67: 47-48 diagnosis in Latin, description and figure captions in English
  10. Hickey, Ralph James. 1977. American Fern Journal 67: 46 line drawings, figures 4-6 in center