A cystocarp [1] is the fruiting structure produced in the red algae after fertilization, especially such a structure having a special protective envelope (as in Polysiphonia). The structure from which carpospores are released.

The zygote grows, still attached to the gametophyte, within a structure called the cystocarp. The cystocarp has an external layer called the pericarp that is formed from the female gametophyte's tissue (meaning it is haploid).

The meaning of CYSTOCARP is the fruiting structure produced in the red algae after fertilization; especially : such a structure having a special protective envelope (as in Polysiphonia).

Nov 25, 2022 · Many gonimoblast filaments attached to the placental cell are covered by sterile vegetative filaments and develop an urn-shaped structure called the cystocarp. The outer covering of the cystocarp is a two-layered wall and is known as the pericarp .

Oct 7, 2024 · Sterile cells adjacent to the carpogonium grow to form a protective layer known as sterile filaments, enclosing the gonimoblast filaments and carposporangia within a sheath, ultimately forming a large urn-shaped structure called a cystocarp or carposporophyte.

A cystocarp is composed of both female gametophyte tissue (n) and carposporophyte tissue (2n). The outer layer of the cystocarp, the pericarp (peri- meaning around) is derived from the female gametophyte and is haploid.

Through a tube of the trichogyne, a hair-like receptive protuberance of the carpogonium, the nucleus of the male cell moves towards the egg cell, creating a zygote that develops into a cystocarp. In the cystocarp, diploid carpospores ( 2N ) form and escape through a hole, eventually growing into new tetrasporophytes.

Diagnostic are the complete absence of sterile gonimoblast tissue within the cystocarp; early cytological modification of the inner pericarp; an extensive network of secondary fusions between carposporophytic andgarnetophytictissues in which gonimoblast cells fuse onto inner pericarp cells, followed by further fusions of cells in the floor of th...

THE following account of the structure and development of the procarps and cystocarps in the genus Ptilota is the result of the writer's studies begun in i892 upon two Pacific coast forms.

cystocarp a structure produced from the fertilized CARPOGONIUM of a red alga which irritates the CARPOSPORES.