Lycopsida 



Sporophyte with roots, stems and spirally arranged 

 leaves (microphylls). Protostelic (solid or medul- 

 lated) sometimes polystelic (rarely polycyclic). Some 

 with secondary thickening. Sporangium thick- 

 walled, homosporous or heterosporous, borne 

 either on a sporophyll or associated with one. 

 Antherozoids biflagellate or multiflagellate. 



1 Protolepidodendrales* 



Drepanophycaceae* Aldanophyton,"^ Baragwanathia* 



Drepanophycus * 

 Protolepidodendraceae * Protolepidodendron * 



2 Lycopodiales 



Lycopodiaceae Lycopodites,^ Lycopodium, 



Phylloglossum 



3 Lepidodendrales* 



Lepidodendraceae * Lepidodendron, * Lepidophloios, * 

 Bothrodendraceae* Bothrodendron"^ 

 Sigillariaceae* Sigillaria* 

 Pleuromeiaceae* Pleuromeia* 



4 Isoetales 



Isoetaceae Nathorstiana* Isoetes, Stylites 



5 Selaginellales 



Selaginellaceae Selaginellites* Selaginella 



50 



