What is longitudinal groove run lengthwise separating theca?
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Thecae are locules of anther, each containing two microsporangia. Anther is dithecous and the two thecae are separated by a column of sterile tissues (connective tissues), running lengthwise which is externally visible as deep longitudinal groove (narrow cut or depression). These types of partition also exist between sporangia in a theca.
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Explanation:
Each lobe has two theca, i.e. each lobe is dithecous. A longitudinal groove runs lengthwise to separate the theca.
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