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A THEORY ON THE EVOLUTION OF THE EXINE IN ORCHIDACEAE
Author(s) -
BurnsBalogh Pamela
Publication year - 1983
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1983.tb07920.x
Subject(s) - biology , pollen , orchidaceae , sporopollenin , botany , evolutionary biology
The development of secondarily derived features in orchid pollen precludes the possibility of applying evolutionary trends hypothesized for dicot pollen to orchid pollen and perhaps even monocot pollen. There are three lines of pollen wall development, all secondarily derived from a possible tectate‐perforate ancestral type, i.e., tectate‐imperforate with incipient columellae (Cypripedioideae), intectate lacking a foot layer (Orchidoideae), and tectate‐imperforate with globular masses of sporopollenin (Vandoid Epidendroideae).