98 
VII. LASTHEA. 
1. Lastrea Thelypterls, Presl. Marsh Buckler 
Fern Fronds lanceolate with a broad base, pinnate, 
glandless ; pinna; linear- lanceolate, deeply pinnatifid ; lobes 
oblong, the edges revolute in the fertile fronds, which thus 
appear contracted. 
LASTBEA THELTP- 
IFIUS. Presl: Bab. 
Man 409: Newm. 183: 
Flongr. Brit. iv. 96 
ASPIDIDM THELTPTE- 
RI8, Swartz : Sm. Eng. 
Fl. iT. 272: Hook and 
Ani. Fl. 569: Franc. 35. 
POLYPODIUM THE- 
LTPTEBIS, Linnaeus 
AcBosncmiM THE- 
LTPTERI8, Linnaeus. 
POLTSTICHCM THE- 
LYPTEBIS, Both. 
THELTPTEMS PALUS- 
TBia, Schott HEMES- 
THECM THELTPTEBU, 
Newman, App. xxii. 
The Marsh Buck- 
ler Fern has a very 
widely extended 
creeping caudex, 
which is slender, 
dark-coloured, near- 
ly smooth, and fur- 
nished with mat- 
ted fibrous roots. 
The fronds which 
perish annually, and 
are renewed, the bar- 
ren ones about May, 
the fertile ones about 
July, are slender 
and fragile, erect, [Lwtrea ThelypterisJ 
