Abstracts received so far:
- adaptations 1
- apomixis 6
- Argyrochosma 4
- arid climates 3
- arid lands 5
- Astrolepis 4
- Cheilanthes 4
- cheilanthoid ferns 4
- deserts 3, 5
- desiccation tolerance 7
- drought adaptations 3
- environment 7
- epiphyte 1
- evolution 7
- fern 1
- ferns 2
- life cycle 6
- Paraceterach 4
- Pellaea 4
- pit membrane 2
- pteridophyte 5
- pteridophytes 3, 6, 7
- stress biology 7
- tracheids 2
- vessels 2
- xeric environments 6
- xerophytism 1
- xylem 2