FtKN KAMI I. Y 



17. STRUTHIOPTERIS, OSTKICH-FEKX (which the name means 

 in Greek, from tin- large plume-like sterile from!-). 



S. Germanica. Alluvial grounds, X. : sterile fronds tall, 2 - 5 high, 

 lanceolate, narrowed at the base, into a short angular stalk, pinnate; pinnie 

 very many, narrowly lanceolate, pinnatifid more than hah- way to the midrib; 

 lobes numerous, oblou^; fertile fronds very much shorter, blackish, standing 

 erect after the others have withered. 



18. ONOCLEA. SENSITIVE-FERN. (Name, from the Greek, mean- 

 ing a closed vessel, referring to the berry-like fructification.) The only species is 



O. sensibilis. Common in wet places : sterile fronds of all sizes up to 2 

 high, broadly triangular-ovate, the rhacliis winged ; pinna; not many, lanceolate, 

 entire or obtusely lobcd less than half-way to the midrib, veins everywhere 

 reticulated ; fertile fronds with few closely apprcssed pinnae. 



19. WOODSIA. (For Joseph Woods, an English botanist.) 



W. obtusa. Kooky places, from Carolina N. : fronds 6' - 18' high, slightly 

 glandular, broadly lanceolate, pinnate with ovate or oblong deeply pinnaiitid 

 or again pinnate divisions ; lobes oblong, obtuse ; indusium at first closed, 

 opening into a lew ragged lobes. 



W. Ilvensis. Exposed rocks, common N., and along the Alleghanies: 

 forms large tufts; fronds 4' -8' high, rusty chatty beneath, oblong-lanceolate, 

 pinnate ; divisions ovate, obtusely lobed ; indusium obscure, consisting of a 

 lew jointed hairs. 



20. DAVALLIA. (Named for M. Davall, a Swiss botanist.) Many trop- 

 ical or sub-tropical species, the following cult, in conservatories. 



D. Canariensis, HARE'S-FOOT-FERN, from the Canary Islands, etc. : 

 rootstock creeping above ground, covered with brownish scales, and looking not 

 unlike an animal's paw; fronds few, smooth, broadly triangular, 8'- 15' long 

 and about as wide, 3 4-pinnate ; pinnules cut into a few narrow lobes ; these 

 are directed upwards, bearing at or just below the end a single fruit-dot ; indu- 

 sium whitish, deeply half-cup-shaped. 



D. tenuifblia, from India and China : rootstock creeping, crisp with short 

 chatty hairs; fronds smooth, l-2 high, broadly lanceolate, 3 -4-pinnate ; 

 smallest divisions narrowly wedge-shaped, bearing at the truncated ends one or 

 two fruit-dots ; indusium brownish, mostly broader than deep. 



21. DICKSONIA. (For Jams Dick-son, an English botanist.) The spe- 

 cies all but one tropical or in the southern hemisphere. 



D. punctil6bula. Moist shady places, from N. Carolina N. : rootstock 

 creeping, slender : fronds scattered, thin, minutely glandular, pleasantly odor- 

 ous, laneelote, long-pointed, 2 - 3 high, mostly bipinnate ; pinnules pinnatitid ; 

 the divisions toothed, each bearing a minute fruit-dot at the upper margin ; 

 indusium globular. 



D. antarctica. Tree-fern from New Zealand, a great ornament in large 

 conservatories: trunk 3' -5' thick, sometimes many feet high, bearing in a 

 crown at the top many fronds, 6 -9 long, 2 -4 broad, coriaceous, twice 

 pinnate ; pinnules oblong, acute, pinnatifid ; the oblong-ovate divisions bearing 

 1-4 rather large fruit-dots ; indusium prominent, plainly two-valved. 



22. CYATHEA. (Name from the Greek word for a small cup, referring to 

 the involucre.) Tree-ferns from tropical countries. 



C. arborea. Rarely cult, from W. Indies : trunk sometimes 20 high, 

 Btalk mostly light-brown, and without prickles or chair'; fronds 4 - 10 long, 

 bi|mmate ; pinna' 1 - 2 long, 6' - 8' wide, lanceolate ; pinnules narrowly lance- 

 olate, spreading, pinnatilid to the midrib; lobes oblong, slightly serrate, with 

 4-9 fruit-dots near the midveiii ; involucre beautifully cup-shaped, the margin 

 entire. Several other species, as well as one or two of the allied genus HI.MI 

 TKI.IA (with an imperfect involucre, veins often partly reticulated), are rarely 

 seen in conservatories. 



