Genus: Calamistrum
Systematics :
| Kingdom | Planteriket (Plantae) | ||||||
| Artificial group | Vascular plant (Tracheophytes) | ||||||
| Phylum | Karsporeplanter (Pteridophyta) | ||||||
| Klasse | Bregneplanter (Pteropsida) | ||||||
| Family | Vassbregnefamilien (Marsileaceae) | ||||||
| Genus | Calamistrum | ||||||
| Species | Trådbregne (Calamistrum globuliferum) | ||||||
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