w 



230 



FKU\-FU)UA OK CANADA 



in 



shapml, with loii^ sIt»ndor 

 fj; or liiu'.ir, sr;ilttMt>il over the 



CKNl'S. 



XVI. CamptOSOrtlB. Fiomls all K'afy (invf-ularly 

 points that take toi>t and form lunv plants) ; sori i>. 

 undor surface of t ho frond hotwoon niidrii) and marj^in ; indusiuni slight, (fig-. 10). 

 (A small forn with undividod fronds, oftoii rooting at tips). 



XV II. PolyStlchUia. Fronds all loafy, of firm texture, bright green, and upper surface 

 more or less glossy, the lobes with minute marginal bristle-like spines ; indusiuni hrm, 

 shield-like, attached by its centre, the spore cases showing from beneath its margin all 

 round, (fig. 11, n, nat. size, h, enlarged). (Rather large evergreen glossy ferns). 



XVIII. LaStroa. Fronds all leafy, somewhat leathery, vivid or dark green, rather dull 

 than glossy ; indusium kidney-shaped, attached at a point between its two lobes, the 

 spore cases showing from beneath its margin except at point of attachment, (fig. 9). 

 (Mostly large, much-divided ferns, imperfectly evergreen). 



XIX. Polypodiuxa. Fronds nil leafy, somewhat le;ithery ; no involucre or indusium ; 

 sori round, arranged on each side of midrib (fig. 12); stipes articvilated with the 

 creeping rhizome. (Small creeping ferns, with stalked pinnatifid fronds). 



XX. PhOgOptsriS. I-Vonds all leafy, (.softly herbaceous or papery); no involucre nor 

 indusium; sori round ; stipes continuous with rhizome, (not articulated), (fig. 14). 

 (Rather sm.ill ferns, with creeping rhizomes and long stipes). 



XXI. QyXXiaOgfraiXiniO. Fronds all leafy, (the lower surface in our species covered 

 with a yellow or white powder) ; no involucre or indusium ; sori elongated. (Small 

 ferns with rather long-stiped hard fronds). 



XXII. OsxnUllda. infertile fronds leafy ; fertile fronds, or fertile portions, contracted ; 

 . no involucre nor indusium ; spore cases reticulated two valved with a horizontal r\n^. 



Very large ferns with very stout, branched rhizomes, covered with stipe-stubs). 



XXIII. Schizaa. infertile fronds slender and curled, less than an inch long (like 

 minute tufts of grass) ; fertile ones longvr and straight, expended at top into a few 

 close-set narrow pinn.x* (brush-like) bearing' spore-cases, with ring on top, (fig. 13). 

 (Minute, grass-like). 



2. MOONWORTS AND ADDER'S TONGUE - /-V^;/^/.? mt circulate but 

 folded in hud; spore-cnses splitting into two 7>ah'es, ivithout a ring or elastic rachis. 



XXIV. EotrycMum. Frond erect leafy, with terminal branched spikes, bearing non- 

 reticulated spore-cases in double rows on the face of the branches, (fig. 16). (Small 

 ferns, with fronds in two parts, — a lower, leafy, divided, infertile portion or lamina, 

 and a terminal branched fertile spike). 



XXV. 0plli0|[l0SSUni. Frond erect, with a single sheathing leaf, and a simple stalk, 

 bearing two rows of non-reticulated splitting spore-cases on the edges of its upper 

 part, (fig. 17). (A small fern with a simple lamina subtending a simple fertile spike). 



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