Reticulate and Allied Exines

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Abstract
The reticulate and allied types of exines are discussed in order to provide clearer criteria for differentiating the latter from the typically reticulate exine. A short recapitulation of known terminological concepts, as well as a comprehensive description of reticulate exine is presented. Frequently, exines consisting of delicate elements give an erroneous impression of being reticulate and therefore are more or less carelessly called by this term. The structure of the tectum, as well as the diameter of the lumina, foveolae, etc. in a pattern, are those features upon which the choice of an appropriate and correct term for the description depend. Short descriptions of the main morphological features found in the tectum-bacula-complex (sexine) are given. Three-dimensional sketches, representing structures discussed, should contribute to a more realistic presentation of their morphological characteristics.

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