Numerical Taxonomy and Generic Circumscription in the Acrochaetiaceae (Rhodophyta)

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Abstract
A numerical classification of 170 descriptions of 112 spp. of Acrochaetiaceae results in clusters which are neither comparable with generic circumscriptions previously suggested nor permit the division of the family into a number of better defined genera based on the consideration of different or additional character complexes. All genera traditionally attributed to the Acrochaetiaceae can be included in the single generic epithet Audouinella. No formal subgeneric classification is proposed, although Audouinella is divided into a number of sections that generally correspond to groupings formed from numerical taxonomy. These groupings are delimited on the basis of standard morphological characteristics, e.g., habit, chloroplasts, pyrenoids and the structure of the basal system, without reproductive criteria.

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