1. Fern of North Africa and Azores and Canary Islands
   - spider fern, Pteris serrulata 
2. Epiphytic fern found in lowland forests of tropical America
   - grass fern, Vittaria lineata 
3. Epiphytic fern with straplike usually twisted fronds of tropical Asia and Polynesia and America
   - Ophioglossum pendulum

Derived forms: ribbon ferns

Type of: adder's tongue, adder's tongue fern, fern

Part of: genus Pteris, genus Vittaria, Pteris, Vittaria

• common alder
• common allamanda
• common American shad
• common amsinckia
• common apricot
• common arrowhead
• common ax
• common axe
• common bamboo
• common barberry
• common barley
• common basil
• common bean
• common bean plant
• common bearberry
• common beech
• common beet
• common bile duct
• common birch
• common bird cherry
• common blackfish
• common bog rosemary
• common booklouse
• common box
• common brant goose