1. North American fern often bearing bulbils on the leaflets
   - bulblet fern, bulblet bladder fern, berry fern

Type of: bladder fern

• sign language
• sign manual
• sign of the cross
• sign of the zodiac
• sign off
• sign on
• sign over
• sign painter
• sign up
• signage
• signal
• signal box
• signal caller
• signal detection
• signal fire
• signal flag
• signal level
• signal light
• signal tower
• signal-to-noise
• signal-to-noise ratio
• signal/noise
• signal/noise ratio
• signaler
• signaling