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Lycopodium lagopus — one-cone clubmoss

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Facts

One-cone clubmoss is much less common than its sister taxon common clubmoss (Lycopodium clavatum), and found in the more northern and higher-elevation portions of New England.

Habitat

Anthropogenic (man-made or disturbed habitats), forest edges, forests, meadows and fields

New England distribution

Adapted from BONAP data

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North America distribution

Adapted from BONAP data

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Characteristics

Habitat
terrestrial
New England state
  • Connecticut
  • Maine
  • Massachusetts
  • New Hampshire
  • Vermont
Leaf shape
the vegetative leaves are short and scale-like
Spore leaf arrangement
the sporophylls are located on spore cones at the tips of the shoots or branches
Form of shoot
the plant has an upright stem, and the stem has simple branches
Horizontal stem
the horizontal stem is on the surface of the ground
Leaf differences
the vegetative leaves within a node are all similar in size and shape
Teeth on leaf edges
  • the edges of the vegetative leaves have no teeth
  • the edges of the vegetative leaves have tiny teeth
Constriction zones
  • there are constricted zones on the horizontal stem where the leaves are smaller smaller or closer together
  • there are constricted zones on the vertical stem where the leaves are smaller smaller or closer together
Spore leaf length
1.5–2.6 mm
Leaf outline
the vegetative leaves are long and very narrow (linear)
Show all characteristics

  • Clonal plantlets

    Gemma arrangement
    NA
    Gemma shape
    NA
    Gemma width
    0 mm

  • Leaves

    Leaf differences
    the vegetative leaves within a node are all similar in size and shape
    Leaf length
    3–5 mm
    Leaf orientation
    • the vegetative leaves are pressed against the stem
    • the vegetative leaves spread slightly away from the stem, at a steep angle
    Leaf outline
    the vegetative leaves are long and very narrow (linear)
    Leaf ranks
    12 or more
    Leaf shape
    the vegetative leaves are short and scale-like
    Spore leaf length
    1.5–2.6 mm
    Teeth on leaf edges
    • the edges of the vegetative leaves have no teeth
    • the edges of the vegetative leaves have tiny teeth

  • Place

    Habitat
    terrestrial
    New England state
    • Connecticut
    • Maine
    • Massachusetts
    • New Hampshire
    • Vermont
    Specific habitat
    • edges of forests
    • forests
    • man-made or disturbed habitats
    • meadows or fields

  • Spores or spore cones

    Cone base at stem
    the base of the spore-cone has a distinct stalk
    Cone stalk branching
    the stalks bearing the spore cones are unbranched
    Cone width
    3–5 mm
    Length of cone
    20–80 mm
    Number of cones
    1–2
    Quillwort itssue covering spores
    NA
    Same or different spores
    there is only one type of spore present
    Spore girdle
    NA
    Spore leaf arrangement
    the sporophylls are located on spore cones at the tips of the shoots or branches
    Spore leaf lifespan
    the sporophylls wither and fall off at the end of the growing season
    Spore leaf orientation
    • the sporophylls are pressed against the spore cone
    • the sporophylls slant out from the axis at an angle of 45–90 degrees
    Spore leaf shape
    the spore-bearing leaves are small and scale-like
    Spore leaf teeth
    • The edges of the spore-bearing leaves are smooth, and without teeth
    • the edges of the spore-bearing leaves have tiny teeth
    Spore texture
    the spore surface has a net-like pattern on it (reticulate)
    Sterile tip of cone
    the spore cone does not have a slender, sterile tip (the whole cone produces spores)

  • Stem, shoot, branch

    Branch cross-section
    the outermost level of branches are round, elliptic or semicircular in cross-section
    Branch form
    the branches are smaller than the main stem
    Constriction zones
    • there are constricted zones on the horizontal stem where the leaves are smaller smaller or closer together
    • there are constricted zones on the vertical stem where the leaves are smaller smaller or closer together
    Form of shoot
    the plant has an upright stem, and the stem has simple branches
    Horizontal stem
    the horizontal stem is on the surface of the ground

Wetland status

Usually occurs in non-wetlands, but occasionally in wetlands. (Wetland indicator code: FACU)

In New England

Distribution

Connecticut
present
Maine
present
Massachusetts
present
New Hampshire
present
Rhode Island
present
Vermont
present

Conservation status

Exact status definitions can vary from state to state. For details, please check with your state.

Massachusetts
fairly widespread (uncertain) (S-rank: S4?)
Rhode Island
state endangered (code: SE)

From Flora Novae Angliae dichotomous key

2.  Lycopodium lagopus (Laestad. ex Hartm.) G. Zinserling ex Kuzeneva-Prochorova N

one-cone clubmoss. Lycopodium clavatum L. ssp. monostachyon (Hook. & Grev.) Selander; 
L. clavatum L. var. lagopus Laestad. ex Hartm.; L. clavatum L. var. megastachyon Fern. & Bissell; L. clavatum L. var. monostachyon Grev. & Hook. • CT, MA, ME, NH, VT; primarily of northern New England, becoming rare to the south. Fields and forest openings and borders. Lycopodium lagopus has a more northern distribution that its sister species, L. clavatum. Intermediate forms between these two species do exist, but whether they represent intermediate morphologies or hybrids has not been determined.

Native to North America?

Yes

Sometimes confused with

Lycopodium clavatum:
spore cones borne 1-5 together, when more than 1 than each with a separate, stalk-like branch (vs. L. lagopus, with spore cones borne singly or in unstalked pairs). Note that L. clavatum and L. lagopus sometimes occur together. When they do, L. clavatum has lighter green leaves that spread more and releases its spores later than co-occurring L. lagopus.

Synonyms

  • Lycopodium clavatum ssp. monostachyon (Hook. & Grev.) Selander
  • Lycopodium clavatum var. lagopus Laestad. ex Hartm.
  • Lycopodium clavatum var. megastachyon Fern. & Bissell
  • Lycopodium clavatum var. monostachyon Grev. & Hook.

Family

Lycopodiaceae

Genus

Lycopodium