Lycopodium obscurum L. var. isophyllum Hickey
Lycopodium hickeyi W.H. Wagner， Beitel & Moran
Hickey’s tree clubmoss, Pennsylvania clubmoss
Hickey’s tree clubmoss is a native of northeastern North America.
Identification: This club moss reaches up to 6″ (15 cm) in height, branching several times, looking like a tiny tree. Each branch is uniformly covered with many leaves up to ¼″ (6.3 mm) long. Upward-pointing cone-like structures called strobili, ¼–2½″ (8.4–63 mm) long, often appear on top.
Habitats: Dry or mesic conifer forests.
Online References:
PlantSystematics.org (Dendrolycopodium)
Wikipedia (Lycopodium)
References:
Dendrolycopodium hickeyi (W.H. Wagner， Beitel & R.C. Moran) A. Haines
Lycopodium obscurum L. var. isophyllum Hickey
Lycopodium obscurum L. var. isophyllum Hickey
8/20/2009 · Hayes Woods Nature Trail, Shirley St., Pepperell, Massachusetts · ≈ 10 × 11″ (26 × 27 cm) 
ID is uncertain 
8/20/2009 · Hayes Woods Nature Trail, Shirley St., Pepperell, Massachusetts · ≈ 6 × 7″ (14 × 17 cm) ID is uncertain 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Lycopodiophyta | Ancient plants that have only a single vein per leaf, limiting size |
| Class | Lycopodiopsida | “Fern allies”—clubmosses and firmosses |
| Order | Lycopodiales | Lycopodiums |
| Family | Lycopodiaceae | Lycopodiums, clubmosses |
| Genus | Lycopodium | From Greek lukos, “wolf,” and podion, “foot” |
| Species | hickeyi | For botanist and professor Dr. R. James Hickey |
Lycopodium hickeyi description by Thomas H. Kent, not updated.
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