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In the reproductive cycle of corallines, both sexual gametes, asexual carposporangia, and asexual sporangia occur.

Gametes (sexual) are produced by spermatangial initials and are borne in uniporate conceptacles. Tetra/bisporangia (asexual) can be borne in either uniporate or multiporate conceptacles, or they are grouped in sori and formed by stalk cells. Tetra/bisporangial conceptacles are formed by specialised groups of cells (initials); these initials are termed conceptacle primordia.

Filaments parallel to the roof....

Conceptacle roofs are either formed by a columella (group of decalcified filaments rising centrally from the conceptacle floor), by an elongation of decalcified filaments interspersed between the sporangia, or by filaments which surround and enclose the conceptacle chamber. Roofs of sori are formed by elongations of interspersed calcified filaments (paraphyses).

Carposporangia are asexual reproductive organs which are formed by special filaments (gonimoblasts) and are borne in former sexual conceptacle chambers.

Go to the Vegetative Anatomy.

Click here to learn more from Derek Keats about sex and life cycle in corallines.

Created by Michael Rasser