Lycopodium lagopus (One-cone Clubmoss)
|Also known as:||One-cone Ground-pine|
|Habitat:||part shade, shade, sun; moist to dry sandy or rocky soil; forest edges and openings, grassy fields, bog and swamp edges|
|Fruiting season:||July - October|
|Plant height:||4 to 10 inches|
|Wetland Indicator Status:||GP: none MW: FAC NCNE: FACU|
|MN county distribution (click map to enlarge):|
|National distribution (click map to enlarge):|
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Leaves and stems:
Leaves are evergreen, crowded and alternate but spirally arranged with 12 to 20 evenly spaced leaves in a cycle, appearing as 12 to 20 columns when viewed from the side of the stem (12 to 20-ranked), and round in cross-section (like a bottle brush). Leaves are appressed to ascending, less than ¼ inch (3 to 5 mm) long, to .7 mm wide, medium green, toothless, linear with a white, hair-like extension at the tip that is half or more as long as the blade. The hair-like tip may shed but usually persists.
Stems are horizontal, running above ground or just below the surface of the duff layer, but not underground. At fairly regular intervals, erect shoots emerge, each with 2 or 3 erect to ascending branches, the main branches sometimes with a few lateral branches. Each year's new growth is marked by a distinct constriction where the annual bud grew, typically with a whorl of smaller leaves at that point. Horizontal stems can reach 9 feet long and the erect shoots up to 10 inches tall.
Spores develop in spike-like or cone-like structures called strobili, usually single at the tip of a long stalk and ¾ to 2+ inches long. Occasionally 2 strobili are at the tip, each stalkless or nearly so. The cluster stalk is up to 5 inches long with appressed, scale-like leaves spiraling up at regular intervals, the scales also with hair-like extensions at the tip.
Each tiny spore sac is attached to a scale (sporophyll) that is less than 1/8 inch (to 2.5mm) long, triangular to tear-drop shaped and tapering to a slender, sharply pointed tip with a hair-like extension. Scales are initially light green and tightly appressed, turning yellowish as they mature and light brown when dry, then become more spreading to release the spores in late summer into fall. The strobili persist through winter.
One-cone Clubmoss is occasional to common in Minnesota's forests north of the Metro area. It is one of two Minnesota clubmoss species still in the Lycopodium genus, which many references have now split into several genera and we have followed suit. Distinguishing characteristics of the new groups are: whether spores develop in cone-like strobili or in leaf (or leaf-like) axils, whether strobili are stalked or stalkless, whether horizontal stems are above or below ground, whether branching on erect shoots is tree-like or not, the number of leaves in a spiral cycle, whether leaves are scale-like or not and whether they have a hair-like tip. The Lycopodium species all have stalked strobili, above ground horizontal stems, leaves that are not scale-like, are 12 to 20-ranked and have a hair-like tip. One-cone Clubmoss also has strobili usually single (occasionally 2) at the tip of the stalk, erect shoots have 2 to 3 erect to ascending branches. The above ground stems, branching of the erect shoots, and leaves that are appressed to ascending and have a hair-like tip can help identify it even when strobili are not present.
The other Lycopodium species in Minnesota, Running Clubmoss (Lycopodium clavatum) usually has 2 or more strobili and each cone is also stalked, leaves tend to be more ascending to spreading than appressed, and branches tend to be more numerous and less erect. The differences can be subtle, however, especially considering L. lagopus and L. clavatum were once considered the same species. Compare with other clubmosses with cone-like strobili: Spinulum species have stalkless strobili and leaves 8 to 10-ranked, Dendrolycopodium have stalkless strobili and tree-like branching, and Diphasiastrum have stalked strobili but scale-like leaves, and none of these have the hair-like extensions on leaf or scale tips. While several different clubmoss species may grow side by side, hybridization is not common.
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- One-cone Clubmoss plants
- One-cone Clubmoss plants
- a mat of One-cone Clubmoss
- One-cone Clubmoss habitat
- scan of plant
- hair-like tips on leaves
- comparison of Lycopodium clavatum and L. lagopus strobili
Photos courtesy Peter M. Dziuk taken in Cook and Lake counties.
Have you seen this plant in Minnesota, or have any other comments about it?