Australian Tropical Ferns and Lycophytes - Online edition
4.8.1 Costa or costules
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![](../../images/features/4_8.1_costa_or_costules/thumbs/char_4_8_1_costa_sml.jpg)
Costa present: may be visible on the upper and/or lower surface.
![](../../images/features/4_8.1_costa_or_costules/thumbs/char_4_8_1_nocosta_sml.jpg)
Costa absent: not visible on both surfaces.
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