Abstract
Petiolar characters of five species of Asplenium, viz., A. cheilosorum, A. dalhousiae, A. laciniatum, A. planicaule, and A. varians, have been investigated and their taxonomic significance is discussed. Petioles in A. varians receive a single vascular strand from the rhizome with two separate xylem strands, which during their upward course, unite to form a single xylem strand. In A. dalhousiae and A. laciniatum each petiole receives two widely separated vascular strands from the rhizome, which remain separate throughout the petiole. In A. cheilosorum and A. planicaule, the two separate vascular strands join each other within the petiole to form a single vascular strand. The shape of xylem strands in a transverse section in all the five species is distinctive.
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