Crossword clues for archesporium
The Collaborative International Dictionary
archesporium \archesporium\ n. 1. a primitive cell or group of cells from which a mother cell develops.
Syn: archespore.
WordNet
n. primitive cell or group of cells from which a mother cell develops [syn: archespore]
[also: archesporia (pl)]
Usage examples of "archesporium".
The archesporium arises by the next divisions in the outer layer of cells, and thus extends over the summit of the columella.
In some species, although the columella and archesporium arise in the usual way, both give rise to mingled spores and elaters, and no sterile columella is developed.
The development of the sporogonium proceeds as in the Bryales, but the dome-shaped archesporium extends over the summit of the columella and an air-space is wanting.
The spores are derived from the endothecium, but no distinction of a sterile columella and an archesporium is established in this, a variable number of its cells becoming spore-mother-cells while the rest serve to nourish the spores.
In all other Bryales there is a definite columella extending from the base to the apex of the capsule, the archesporium is derived from the outermost layer of cells of the endothecium, and an air space is formed between the spore-sac and the wall.