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Coralline algal thalli (i. e., plant bodies) are formed by adjacent filaments which are calcified and repeatedly branched.
Consecutive cells within one filament are connected by primary pit connections; cells of adjacent filaments may be connected by secondary pit connections and/or cell fusions.
Algal thalli can be dimerous or monomerous.
Dimerous thalli consist of unilayered basal primigenous filaments ("hypothallium" of older literature), from which the postigenous filaments ("perithallium" of older literature) arise dorsally at right angles. Primigenous filaments can be composed of palisade cells (i. e., cell diameter is higher then cell length.
Monomerous thalli consist of basal multilayered core filaments ("hypothallium" of older literature) which can be coaxial (i. e., they are arranged in tiers) or non-coaxial (= plumose). Some derivates of core filaments curve outward to form the peripheral filaments ("perithallium" of older literature).
Meristematic cells (i. e., vegetative or subepithallial initials) terminate the filaments and increase filament length.
Epithallial cells are mostly uncalcified cells forming the thallus surface (epithallium) and thus are lying above the meristematic cells.
Trichocytes are potentially hair producing enlarged cells.
Go to the Anatomy of Reproductive Structures
Created by Michael Rasser