exosporic en · ADJ
Etymology
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Meanings
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(not-comparable) Relating to the development of gametophytes outside the spore wall.
Another feature unique to embryophytes, and generally associated with heterospory, is endosporic development of gametophytes. In many homosporous plants, the spore germinates and grows into a gametophyte completely outside the spore wall. This is called exosporic development.
1984, Scagel, Robert Francis, chapter 10, in Plants, an evolutionary survey, page 286: