FILICES. (FERNS.) 5V5 



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

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



7. A. thelypteroides, Michx. Fronds pinnate ; pinnae deeply piimat(fid 9 

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

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

 July.-Sept. 



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

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

 shaped. 



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

 smooth), oblong or lanceolate in outline; pinna 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-foemina 

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

 Moist woods; common. July. (Eu.) 



11. DICKSONIA, L'Her. SITOLOBIUM, 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. D. pliuctiltibllla, Hook. Minutely glandular and hairy (2 high) } 

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

 strong stalks rising from slender extensively creeping rootstalks, pinnate, the 

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

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

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

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



12. WO 6 1> 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, tinder the sporangia, either small and open, or else early bursting at the top 

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

 (Dedicated to Joseph Woods, an English botanist.) 



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

 sporangia, but early opening at the top, soon splitting into several spreading jagged 

 lobes. 



1. W. obtilsa, Torr. Frond broadly-lanceolate, minutely glandular- 

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

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



