Diphasiastrum
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| Diphasiastrum | |
|---|---|
 | |
| Diphasiastrum complanatum (previously called Lycopodium complanatum). | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Lycophytes |
| Class: | Lycopodiopsida |
| Order: | Lycopodiales |
| Family: | Lycopodiaceae |
| Subfamily: | Lycopodioideae |
| Genus: | Diphasiastrum Holub |
| Species | |
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See text | |
Diphasiastrum is a genus of clubmosses in the plant family Lycopodiaceae. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it is placed in the subfamily Lycopodioideae.[1] It is closely related to the genus Lycopodium, and some botanists treat it within a broad view of that genus as a section, Lycopodium sect. Complanata. Some species superficially resemble diminutive gymnosperms and have been given common names such as ground-pine or ground-cedar.
There are 16 species, and numerous natural hybrids in the genus; many of the hybrids are fertile, allowing their occurrence to become frequent, sometimes more so than the parent species. The basal chromosome count for this genus is n=23, which is distinctively different from other lycopods.[citation needed]
Several species have been used economically for their spores, which are harvested as Lycopodium powder.
As of June 2024[update], the Checklist of Ferns and Lycophytes of the World recognized the following species:[2]
- Diphasiastrum alpinum (L.) Holub – alpine clubmoss; circumpolar, subarctic and alpine
- Diphasiastrum angustiramosum (Alderw.) Holub – New Guinea
- Diphasiastrum carolinum (Lawalrée) Holub
- Diphasiastrum complanatum (L.) Holub – flat-stemmed clubmoss, northern running-pine, or ground cedar; circumpolar, cool temperate
- Diphasiastrum digitatum (Dill. ex A.Br.) Holub – fan clubmoss, southern running-pine, or running cedar; eastern Canada, northeastern United States, Appalachian Mountains
- Diphasiastrum falcatum B.Øllg. & P.G.Windisch
- Diphasiastrum fawcettii (F.E.Lloyd & Underw.) Holub – Jamaica, Hispaniola
- Diphasiastrum henryanum (E.D.Br. & F.Br.) Holub – Marquesas Islands
- Diphasiastrum madeirense (J.H.Wilce) Holub – Madeira, Azores
- Diphasiastrum multispicatum (J.H.Wilce) Holub – Taiwan, Philippines
- Diphasiastrum nikoense (Franch. & Sav.) Holub – Japan
- Diphasiastrum platyrhizoma (J.H.Wilce) Holub – Borneo, Sumatra
- Diphasiastrum sitchense (Rupr.) Holub – Alaskan clubmoss; northern North America
- Diphasiastrum thyoides (Humb. & Bonpl. ex Willd.) Holub – Caribbean, Central and South America
- Diphasiastrum tristachyum (Pursh) Holub – blue clubmoss, blue ground-cedar; circumpolar, cool temperate
- Diphasiastrum veitchii (Christ) Holub – Veitch's clubmoss; eastern Himalayas east to Taiwan
- Diphasiastrum wightianum (Wall. ex Hook. & Grev.) Holub – southeast Asia, New Guinea
- Diphasiastrum yueshanense (C.M.Kuo) Holub – Taiwan
- Diphasiastrum zanclophyllum (J.H.Wilce) Holub
Selected hybrids
Some species are treated as hybrids, although not by all sources:[2]
- Diphasiastrum × habereri (House) Holub (D. digitatum × D. tristachyum)
- Diphasiastrum × issleri (Rouy) Holub (syn. D. issleri, D. alpinum × D. complanatum)
- Diphasiastrum × oellgaardii Stoor, Boudrie, Jérôme, K.Horn & Bennert (D. alpinum × D. tristachyum)
- Diphasiastrum × sabinifolium (Willd.) Holub (syn. D. sabinifolium, D. sitchense × D. tristachyum)
- Diphasiastrum × takedae Ivanenko (D. alpinum × D. sitchense)
- Diphasiastrum × verecundum A.V.Gilman (D. complanatum × D. digitatum)
- Diphasiastrum × zeilleri (Rouy) Holub (D. complanatum × D. tristachyum)
