15 slides

Primitive ferns (Psilophytatae)
1 - Psilotum, t.s. of rhizome showing protostele
2 - Psilotum, t.s. of stem showing squamous leaves, aktinostele

Clubmosses (Lycopodiatae)
3 - Lycopodium, t.s. of stem showing plectostele
4 - Lycopodium, t.s. of strobilus showing isospores
5 - Selaginella, t.s. of stem showing siphonostele

Horse-tails (Equisetatae)
6 - Equisetum, t.s. of stem
7 - Equisetum, t.s. of strobilus showing spores
8 - Equisetum, w.m. of spores with elaters

Ferns (Filicatae)
9 - Aspidium, t.s. of root
10 - Aspidium, t.s. of stem
11 - Aspidium, t.s. of leaf showing sori
12 - Aspidium, w.m. of prothallium showing antheridia and archegonia
13 - Pteridium, t.s. of rhizome
14 - Osmunda, royal fern, rhizome with ectophloic siphonostele t.s.
15 - Phyllitis scolopendrium, hart’s tongue fern, leaf with sori and sporangia t.s.