Rush-like or bushy plumose plants with hollow jointed stems, the 
q leaves being reduced to short cylindrical or funnel-shaped 
sheaths covering the nodes, with or without whorls of jointed 
slender branches Equisetaceae 'p =] 
Plants not rush-like nor bushy plumose with jointed stems 
Small aquatic plants either wholly submerged or amphibious 
as when growing in mud previously covered with water 
Leaves in a basal tuft, grass-like or rush-like, usually 
submerged, the sporangia ) . ccvities at the base of the 
4 
leaves Isoetaceae (p ; one 
Leaf-blades usually floating, on long petioles resembling 
a 4-leaved clover Marsileaceae (| P: mea 
; 
Terrestrial plants (often growing in moist places) 
Moss-like plants with small usually awl-shaped leaves ~.).ici. 
overlap” > apon the trailing or decumbent stems 
i) Small mat-forming plants rarely 10 cm, tall, or if trailing, 
the leaves oval; spores of two sizes, produced in separate 
sporengias leaves 2-3 mm. long Selaginellaceae’ p, al 
Creeping or sometimes erect plants but the erect branches 
usually more than 10 cm, tall; leaves mostly 4-7 mm, long; 
spores all of one size Lycopodiaceae | p: a 
Erect plants with broads SCS pinnate leaves 
Sporangia globose, sessile, about 1 mm, broad, opening by 
two valves, arranged along the margins of modified leaves 
which may be either linear and simple, thus forming a very 
slender spike, or may be pinnate, thus forming a cluster 
resembling a cluster of minute grapes Ophioglossaceae p nat 
Sporangia minute, shaped like a watch, stalked, assembled 
into clusters on the lower sides of the leaves, wither 
ih naked or covered by a thin membrane or b: the curled leaf 
margin (True ferns) Polypodiaceae 
\ 
