no CLASS XXII. ORDER t 



this genus, when ripe, often covers the whole lower 

 surface of the frond like the acrostichum ; it must 

 therefore be examined in the young state.) 55, 5— 

 dorealisy (Roman fern) barren frond pinnatifid, fer- 

 tile one pinnate with acuminate leafets — serrula" 

 tuniy frond pinnate, leafets serrate tapering to both 

 ends. 



Pteris. Capsules arranged in a continued line 

 along the very margin of the frond : involucre open- 

 ing inwards. (When the leaves are extremely small> 

 the rows of capsules on opposite sides meet and 

 cover the lower surface like the onoclea.) 55, 5— « 

 Qquili7ia^ (common brake) leafets pinnate with 

 lanceolate repand-tocthed divisions, upper ones 

 smallest — gracilis^ leafets lanceolate obtuse alter- 

 nate, lower ones pinnatifid — caudata^ leafets doub- 

 ly-pinnate, subdivisions sub-linear — atrofiurfiurca^ 

 frond doubly-pinnate, subdivisions sub-linear, lines 

 of the capsules somewhat interrupted, 



ViTTARiA. Capsules in an uninterrupted line 

 along the disk or margin of the frond : involucre 

 double, one of which opens inwards, the other out- 

 wards. (Leaves always simple.) 55, 5 — lineatUy 

 (ribbon fern) frond linear very long pendant. 



AsPLENiuM. Capsules in lines parallel to each 

 other, situated exactly itiion the secondary veins of 

 the frond : involucres opening inwards. (By the 

 secondary veins is meant those of the middle part 

 of the disk, not the larg;er ones at the margin or 

 midrib. The parallel lines of capsules may stand 

 obliquely with respect to the midrib, but their di- 

 rection must be parallel to each other.) 55. 5— 



Frond doubly-pinnate below montanum^ 



(spleen wort) leafets pinnatifid — rut a-mur aria, frond 

 only pinnate at top with obtuse leafets. — Frond 

 PINNATE ONLY — thelyfitcroides, leafets deeply-pin- 

 uatifid with tooth-serrate divisions — angustifolmm^ 



