FILICES. (PERNS.) 595 



traded; fruit-dots linear, often curved. Rich woods, W. New England to Michi 

 gan, Illinois, and southward along the mountains. Oct. 



7. A. thelyptcroides, Miehx. Fronds pinnate ; pinr<ce deeply pinnatifid, 

 linear-lanceolate (3'- 5' long), pale ; the lobes oblong, obtuse, minutely toothed, 

 crowded, each bearing 3-6 pairs of oblong fruit-dots. Rich woods; not rare. 

 July.-Sept. 



$ 2. ATHYRIUM, Roth. Indusium of the shorter (barely oblong) fruit-dots some- 

 times free at the ends, turgid or vaulted, but thin, ojlen becoming curved or crescent 



t 1 



8. A. Filix-ftiemilia, R. Brown. Frond 2-pinnate (l-3 high, 

 smooth), oblong or lanceolate in outline; pinnae lanceolate, numerous; the nar- 

 rowly oblong pinnules confluent on the rhachis by a narrow margin, sharply pin- 

 natifid-toothed ; fruit-dots 4-8 pairs on each pinnule. ( Aspidium Filix-fcemina 

 & A. asplenioides, Swartz.) A narrow form is Aspidium angustum, Wittd. 

 Moist woods; common. July. (Eu.) 



11. DICKSONIA, L'Her. SITOLOB1UM, Desv. (Tab. 11.) 



Fruit-dots globular (small), marginal, each placed on the apex of a free vein 

 or fork, enclosed in a membranaceous cup-shaped special indusium open at the 

 top, and on the outer side partly covered by the thin apex of the fruit-bearing 

 toothlet of the frond, forming a sort of accessory indusium. Sporangia borne 

 on a somewhat elevated globular receptacle. (Character from our species, 

 which is perhaps to be separated.) (Named for J. Dickson, an English Cryp- 

 togamous botanist.) 



1. I>. plilictilobnla, Hook. Minutely glandular and hairy (2 high) $ 

 fronds ovate-lanceolate and pointed in outline, pale green and very thin, with 

 strong stalks i-ising from slender extensively creeping rootstalks, pinnate, the 

 lanceolate pinnae twice pinnatifid and cut-toothed, the lobes oblong ; fruit-dots 

 minute, on a recurved toothlet, usually one at the upper margin of each lobe. 

 (D. pilosiuscula, Willd. Ncphrodium punctilobulum, Michx. Patania, Presl.) 

 Moist, rather shady places, very common : odorous. July. 



12. WOOD SI A, R. Brown. WOODSIA. (Tab. 12.) 



Fruit-dots globular, borne on the back of simply-forked free veins ; the very 

 thin and often evanescent indusium attached by its base all around the recepta- 

 cle, under the sporangia, either small and open, or else early bursting at the top 

 into irregular pieces or lobes. Small and tufted pinnately-divided Ferns. 

 (Dedicated to Joseph Woods, an English botanist.) 



1. HYPOPELTIS, TOIT. Indusium conspicuous, at first perfectly enclosing the 

 sjjorangia, but early opening at the lop, soon splitting into several spreading jagged 

 lobes. 



1. VF. oil t lisa, Torr. Frond broadly-lanceolate, minutely glandular- 

 hairy (6' -12' high), pinnate; the pinnae rather remote, triangular-ovate or ob- 

 long (!' or more long), bluntish, pinnately parted ; pinnules oblong, very 



