CLASS XXII. ORDER I. 121 



base of upper leafets truncate, of lower ones round- 

 ed — edcneum, leafets serrulate, upper ones cared, 

 lower ones cordate — me I a no c anion ^ leafets crenate 

 with wedge-form base. Frond simple— jVzz/zo- 

 fihyllum^ (walking-leaf) frond lanceolate with a 

 rooting apex. 



ScoLOPEN'DRiuM. Capsules in strait or zigzag 

 parallel lines between the secondary veins (or ribs) 

 of the frond : involucre double, opening on the top 

 of the lines of capsules and folding down towards 

 each side. (In the genus asfilenium, the lines of 

 capsules lie across the veins of the frond ; but in 

 this they are in line with the veins and attached 

 along their sides or between them.) — vul^are^ (ca- 

 terpillar fern) capsules between 2 veins. 



WooDWARBiA. Capsules in oblong or oval 

 spots arranged in regular rows on both sides of the 

 midrib : involucre vaulted and opening inwards. 

 (When the leaves have large segments, the cap- 

 sules are arranged along the midribs of the seg- 

 ments also.) 55. 5 — an^ustifolia^ (kidney-fruit fern) 

 frond pinnate, segments linear acute entire, barren 

 ones sub-serrate — virginica^ segments pinnatind. 



Adiantum. Capsules disposed in oblong spots 

 arranged along the margin of the frond : involucre 

 is formed by turning back the margin of the frond 

 over the capsules, and it opens inwards. (The 

 lines of oblong spots are generally along that mar- 

 gin, which may be considered the end of the leaf or 

 of the segments of the leaf.) 55. 5 — fiedatum^ 

 (maidenhair) frond pedate, branches pinnate, leaf- 

 ets halved. 



AspiDiuM. Capsules in scattered roundish 

 spots on various parts of the whole lower surface 

 ©f the frond : involucre a kidney-form or round 

 membrane, fastened to the frond in or near the cen- 

 ter ©f the fruit-dot, and opening on all sides. (The 



