Australian Tropical Ferns and Lycophytes - Online edition
4.5.8 Pinna or pinnule base auricle
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![](../../images/features/4_5.8_pinna_or_pinnule_base_auricle/thumbs/char_4_5_8_acroscopic_sml.jpg)
Auricle acroscopic: enlarged lobe at the base of the lamina on side of leaflet base closer to leaf apex.
![](../../images/features/4_5.8_pinna_or_pinnule_base_auricle/thumbs/char_4_5_8_basioscopic_sml.jpg)
Auricle basiscopic: enlarged lobe at base of lamina on side of the leaflet further from leaf apex.
![](../../images/features/4_5.8_pinna_or_pinnule_base_auricle/thumbs/char_4_5_8_notauriculate_sml.jpg)
Leaflets not auriculate (no enlarged lobe present at base of lamina).
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