Archesporius (from other Greek: ἀρχή - the beginning and σπορά - the seed ) - a group of cells from which spores develop (in mosses and equidistant ferns) and micro- or megaspores (in diverse spore-like ferns, gymnosperms and angiosperms).
Distinguish between primary and secondary archesporia. Primary archesporia occurs in the early stages of sporangium. Subsequent mitotic cell divisions form sporogenous tissue , or maternal spore cells ( sporocytes ), which directly form spores as a result of meiosis [1] .
The cell of the primary epithelium that separated into the interior during subsequent division forms a secondary archesporium. In the ovule, in the subepidermal layer of nucellus , one archesporial cell appears, less often several (multicellular archesporia) [2] .
Notes
- ↑ Archesporium // Brockhaus and Efron Encyclopedic Dictionary : in 86 volumes (82 volumes and 4 additional). - SPb. , 1890-1907.
- ↑ Article from TSB