Extine | definition of Extine by Medical dictionary
exine (redirected from Extine)
Also found in: Dictionary
exine (ĕk′sēn′, -sīn′)
The outer layer of the wall of a spore or pollen grain.
exine the outer coat of a POLLEN GRAIN, that often has protuberances, spines, etc. The exine also has one or more areas where the wall is thin, forming a pore through which the pollen tube will protrude.
References in periodicals archive
Additionally, irregular shaped pollens without extine (Fig.
Also, the formation of irregular shaped pollens without extine is possibly due to the premature disintegration of the middle layer and tapetum.