Australian Tropical Ferns and Lycophytes - Online edition
4.5.6 Pinna or pinnule base
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![](../../images/features/4_5.6_pinna_or_pinnule_base/thumbs/char_4_5_6_acute_sml.jpg)
Acute, attenuate to cuneate: lamina tapering to base.
![](../../images/features/4_5.6_pinna_or_pinnule_base/thumbs/char_4_5_6_decurrent_sml.jpg)
Decurrent: base attached broadly with lamina extending as a flange on the rachis before and/or after point of insertion of leaflet.
![](../../images/features/4_5.6_pinna_or_pinnule_base/thumbs/char_4_5_6_oblique_sml.jpg)
Oblique or asymmetric: the two sides of the leaflet of different size.
![](../../images/features/4_5.6_pinna_or_pinnule_base/thumbs/char_4_5_6_obtuse_sml.jpg)
Obtuse, cordate or hastate: base attached broadly, rounded or notched or with lobes.
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