Page 119 - Ultimate Visual Dictionary (DK)

ALGAE AND SEAWEEDS
Crinkled margin GREEN SEAWEED RED SEAWEED LIFE-CYCLE OF BROWN SEAWEED
Enteromorpha linza Corallina officinalis Bladder wrack
(Fucus vesiculosus)
Branch
Male Female
Branched, receptacle receptacle
hard thallus
(plant body)

Lamina
Air bladder (blade)
Thallus Stipe
(plant Unbranched, Hapteron Main Hapteron (stalk)
body) spirally twisted (holdfast) stem (holdfast)
frond
MALE AND FEMALE SEAWEEDS
Female
Small hapteron Male receptacle
(holdfast) attaching receptacle
seaweed to mussel
Conceptacle
RED SEAWEED Ostiole
Dilsea carnosa (opening to
conceptacle)
MALE AND FEMALE RECEPTACLES
Paraphysis
(sterile hair)
Ostiole
(opening to
conceptacle)
Antheridium
Thallus
(male sex
(plant organ)
body) Oogonium
(female sex organ)
SECTIONS THROUGH MALE AND FEMALE
CONCEPTACLES
Oogonium
Antherozoid
(male gamete)
Lamina
(blade) Antheridium
(male sex organ)
Oosphere
(female
gamete)
PRODUCTION OF GAMETES
Hapteron
(holdfast) Antherozoid (male Oosphere
GREEN ALGA gamete) swims (female
Spirogyra sp. toward oosphere gamete) is
fertilized by
Cytoplasm Flagellum antherozoid
End wall
to produce
Cell (cylindrical) of cell
a zygote
Cell wall
Flexible stipe FERTILIZATION
(stalk)
Filament
(strand of
linked cells)
Spirally Young thallus
wound
Two filaments (plant body)
linked for chloroplast
conjugation
(sexual Conjugation Hapteron
Hapteron tube (holdfast)
reproduction)
(holdfast)
ZYGOTE DEVELOPS INTO
End wall of conjugation
tube still in place A YOUNG SEAWEED
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