124 CLASS XXII. ORDER I. 



Lygodium. Capsules radiate-striated or wrin- 

 kled, opening laterally, longitudinally or trans- 

 versely ; they are situated upon spikelets ■which 

 proceed from the margin of the frond, each capsule 

 being hid under a scale which falls off frequently 

 in ripening. 55. 5—-/ial7natumy (fringed fern) leaves 

 palmate. 



APPENDIX TO THE ORDER FILICES. 

 Pteroides. 



Plants related to the ferns in their general ha- 

 bit ; but in some degree approaching the habit of 

 pines, umbelliferous and culminiferous plants. The 

 young leaves are never spiral ; in which particu- 

 lar they differ from most of the proper ferns. 



BoTRYCHiuM. Capsules coriaceous, globose, 

 one-celled, smooth ; they are disposed in spikes or 

 racemes, generally open lengthwise, sometimes ir» 

 regularly. 55, 5 — Frond 3-parted, bipinnati- 

 yiD — gracile^ (grape-fern) divisions of the leafet5 

 sub-pinnatifid and sub-dentate — dissectum^ divisions 

 2-parted, 2-toothed at the apex — virginku7n, divi- 

 sions obtuse, sub-3-ioothed — ^^ame, bipinnate-— 

 fiimaroidee, leafets lunate crenate.— -somewhat 

 DOUBLY tern ATE — oblkjuuiu^ Icafcts serrulate, un- 

 equally cordate. 



Ophioglossum. Capsules round, 1 -celled, open- 

 ing transversely ; they are placed on a somewhat 

 jointed spike in two close rows. 55. 5 — vulgatum^ 

 (adder-tongue fcri.) frond ovate simple, spikes 

 about an inch long. 



PsiLOTUM, Capsules globose, 3-celled, 3-seed- 

 ed, opening upwards with three pores ; they are 

 sessile on the branches and axillary. 55. 5 — dicho- 

 (otnay (naked fern) stem naked 3-sided forked. 



Lycopodium. Capsules mostly kidney-form or 



