$ 503.12
Details
Primitive ferns (Psilophytatae): 1(d). Psilotum, rhizome showing protostele t.s.2(d). Psilotum, stem showing squamous leaves, aktinostele t.s. Clubmosses (Lycopodiatae) 3(c). Lycopodium, of stem showing plectostele t.s. 4(e). Lycopodium, of strobilus showing isospores t.s. 5(c). Selaginella, stem showing siphonostele t.s. Horse-tails (Equisetatae) 6(c). Equisetum, stem t.s. 7(d). Equisetum, strobilus showing spores t.s. 8(b). Equisetum, w.m. of spores with elaters Ferns (Filicatae) 9(c). Aspidium, root t.s. 10(c). Aspidium, stem t.s. 11(d). Aspidium, leaf showing sori t.s. 12(f). Aspidium, w.m. of prothallium showing antheridia and archegonia 13(d). Pteridium, rhizome t.s. 14(d). Osmunda, royal fern, rhizome with ectophloic siphonostele t.s. 15(d). Phyllitis scolopendrium, hart's tongue fern, leaf with sori and sporangia t.s.
