The Fern Flora of Illinois 32
Ophioglossaceae 35
Osmundaceae 35
Polypodiaceae 36
Salviniaceae 40
Equisetaceae 40
Lycopodiaceae 41
Salaginellaceae 41
Isoetaceae 42
A Problematical Fern (Gymnogramma lanceolata) 42
The Tall Spleenworts 45
Further Notes on Variation in Botrychium Ramosum 47
Rare Forms of Fernworts--XXII 48
Still Another Christmas Fern 48
Polystichum acrostichoides f. Gravesii 49
Notes on Various Ferns 51
Schizaea Pusilla at Home 53
Pteridographia 55
Index to Recent Literature 60
Editorial 61
Book Notes 62
THE FERN BULLETIN
Vol. XX APRIL, 1912 No. 2