structure of an alga![click to hear](/images/speaker.jpg)
midrib ![click to hear](/images/speaker.jpg)
Projection running the length of the thallus or fronds of certain algae.
aerocyst ![click to hear](/images/speaker.jpg)
Small gas-filled bladder containing nitrogen and oxygen; it is located in the thallus of some algae and provides buoyancy.
thallus ![click to hear](/images/speaker.jpg)
Alga’s main structure, with undifferentiated stem and leaves.
receptacle ![click to hear](/images/speaker.jpg)
Enlarged part, generally located at the tip of a frond, holding the alga’s reproductive organs.