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Porphyra is a foliose red algal genus of laver
Laver (seaweed)

Laver is an Eating seaweed that has a high mineral salt content, particularly iodine and iron. It is used for making #Laverbread, a traditional Welsh dish....
, comprising approximately 70 species. It grows in the intertidal, typically between the upper intertidal to the splash zone. In East Asia, is used to produce the sea vegetable
Seaweed

Seaweed is a loose colloquial term encompassing macroscopic, multicellular, benthos ocean algae. The term includes some members of the rhodophyta, phycophyta and green algae....
 products nori
Nori

is the Japanese name for various edible seaweed species of the red alga Porphyra including most notably P. yezoensis and P. tenera, sometimes called laver ....
 (in Japan) and gim (in Korea), the most commonly eaten seaweed. It is considered that there are 60 to 70 species of Porphyra worldwide and seven in the British Isles.

orphyra displays a heteromorphic alternation of generations.






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Porphyra is a foliose red algal genus of laver
Laver (seaweed)

Laver is an Eating seaweed that has a high mineral salt content, particularly iodine and iron. It is used for making #Laverbread, a traditional Welsh dish....
, comprising approximately 70 species. It grows in the intertidal, typically between the upper intertidal to the splash zone. In East Asia, is used to produce the sea vegetable
Seaweed

Seaweed is a loose colloquial term encompassing macroscopic, multicellular, benthos ocean algae. The term includes some members of the rhodophyta, phycophyta and green algae....
 products nori
Nori

is the Japanese name for various edible seaweed species of the red alga Porphyra including most notably P. yezoensis and P. tenera, sometimes called laver ....
 (in Japan) and gim (in Korea), the most commonly eaten seaweed. It is considered that there are 60 to 70 species of Porphyra worldwide and seven in the British Isles.

Life cycle

Porphyra displays a heteromorphic alternation of generations. The thallus we see is the haploid generation, it can reproduce asexually by forming spores which grow to replicate the original thallus. It can also reproduce sexually. Both male and female gametes are formed on the one thallus. The female gametes while still on the thallus are fertilized by the released male gametes, which are non-motile. The fertilised, now diploid, carposporangia after mitosis
Mitosis

Mitosis is the process in which a eukaryotic cell separates the chromosomes in its cell nucleus, into two identical sets in two daughter nuclei....
 produce spores (carpospores) which settle, then bore into shells, germinate and form a filamentous stage. This stage was originally thought to be a different species of alga, and was referred to as Conchocelis rosea. It is now known to be the diploid stage of Porphyra.

Food

Most human cultures with access to Porphyra use it as a food or somehow in the diet, making it perhaps the most domesticated of the marine algae, known as laver
Laver (seaweed)

Laver is an Eating seaweed that has a high mineral salt content, particularly iodine and iron. It is used for making #Laverbread, a traditional Welsh dish....
, nori
Nori

is the Japanese name for various edible seaweed species of the red alga Porphyra including most notably P. yezoensis and P. tenera, sometimes called laver ....
, zakai, kim, karengo
Karengo

Porphyra columbina, or Karengo in the Maori language, is a type of edible seaweed traditionally harvested by South Island Maori. It is closely related to Japanese Nori....
, sloke or slukos.The marine red alga Porphyra, which used to produce nori in Japan and gim in Korea, has been cultivated extensively in many Asian countries as an edible seaweed used to wrap the rice and fish that compose the Japanese food sushi
Sushi

In Japanese cuisine, is vinegared rice, usually topped with other ingredients, including fish dishes. In Japan, sliced raw fish alone is called sashimi and is distinct from sushi, as sashimi is the raw fish component, not the rice component....
, and the Korean food gimbap
Gimbap

Gimbap or kimbap is a popular Korean cuisine#Korean snacks made from steamed white rice and various other ingredients, rolled in Gim and served cold in bite-size slices....
. In Japan, the annual production of Porphyra spp. is valued at 100 billion yen (US$ 1 billion).

Species

  • Porphyra leucosticta Thur.
  • Porphyra linearis Grev.
  • Porphyra miniata (C.Ag) C.Ag)
  • Porphyra purpurea (Roth) C.Ag)
  • Porphyra umbilicalis (L.) J.Ag.


External links

  • Porphyra human consumption.