Species delineation of the genus Diplazium Swartz (Athyriaceae) using leaf architecture characters

Abstract

© 2018 Bangladesh Association of Plant Taxonomists. The present study was conducted to delineate Diplazium Swartz species based on leaf architecture. Using PAleontological STatistics (PAST), a cluster and Principal Component Analysis of leaf architecture characters of 27 selected Diplazium species at the Philippine National Herbarium (PNH) was done. The dendogram (cophenetic correlation = 0.8436) and principal component analysis supported the four clusters of Diplazium using leaf architecture characters. At Gower distance of 0.25, Diplazium species were categorized as: Cluster 1 (Cladodromous - short stalked, stout and massive 1° vein); Cluster 2 (Reticulodromous - long stalked, moderate 1° vein); Cluster 3 (Craspedodromous - long stalked, stout to massive 1° vein); and Cluster 4 (Craspedodromous - short stalked, stout to massive 1° vein). The unifying characters were apex shape, base symmetry and 1° vein category, while the significant differentiating characters were 2° vein angle of divergence and variation in the 2° vein angle of divergence, 3o vein category, 3° vein angle of divergence, variation in 3° vein angle of divergence, 3° vein spacing and lobation. The successful delineation of Diplazium species proved that leaf architecture can be a good taxonomic marker and could be an alternative way of identifying species in the absence of sori.

Source or Periodical Title

Bangladesh Journal of Plant Taxonomy

ISSN

10282092

Page

123-133

Document Type

Article

Subject

Cladodromous, Cophenetic correlation, Craspedodromous, Leaf architecture, Reticulodromous, Taxonomic marker

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