FiLicEs. (feens.) 599 



8. A. aculeatuin, Swartz, var. Braunii, Koch. Frond spreading, 

 i-pinnate (lJ°-2° long), oblong-lanceolate in outline, with a tapering base, the 

 lower of the many pairs of oblong-lanceolate pinnae gradually reduced in size 

 and obtuse ; pinnules ovate or oblong, obtuse, truncate and almost rectangular 

 at the base, short-stalked, or the upper confluent, sharply toothed, beset with 

 long and soft as well as chaffy hau-s. (A. Braunii, Spenner.) — Deep woods, 

 mountains of New Hampshire, Vermont, N. New York, and northward. (Eu.) 



* # Fronds simply pinnate, mostly upright. 



9. A. acrosticholdes, Swartz. Frond lanceolate (1°-2J° high), 

 stalked ; pinnae linear-lanceolate, somewhat scythe-shaped, half-halberd-shaped at 

 the slightly stalked base, serrulate with appressed bristly teeth ; the fertile (upper) 

 ones contracted and smaUer, bearing contiguous fruit-dots near the midrib, which 

 are confluent with age, and cover the surface. (Nephrodiunr acrosticholdes, 

 Michx.) — Var. incIstjm (A. Schweinitzii, Beck) is a state with cuUobed 

 pinnse, a not unfrequent case in the sterile fronds ; sometimes the tips of almost 

 all of them fertile more or less. — Hill-sides and ravines in woods ; common 

 northward, and southward along the AUeghanies. July. 



10. A. liOncllitiS, Swartz? Frond linear-lanceolate (9' -20' high), scarcs- 

 ly stalked, very rigid; pinnae broadly lanceolate-scythe-shaped, or the lowest triangular, 

 strongly auricled on the upper side and wedge-truncate on the lower, densely 

 spiny-toothed (1' or less in length), copiously fruit-beSring ; fruit-dots contigu- 

 ous and near the margins. — Woods, southern shore of Lake Superior, and 

 northwestward. (Eu.) 



15. ONOCL.EA, L. Sensitive Fern. (Tab. 12.) 



Fertile frond twice pinnate, much contracted ; the pinnules short and revolute, 

 usually so rolled up as to be converted into berry-shaped closed Involucres filled 

 with sporangia, and forming a one-sided spike or raceme. Fruit-dots one on 

 the middle of each strong and simple primary vein (with or without sterile cross- 

 veins), round, soon all confluent. Indusium very thin, hood-like, lateral, fixed 

 by its lower side, free on the upper (towards the apex of the pinnule). — Sterile 

 fronds rising separately from the naked extensively creeping rootstock, long- 

 stalked, broadly triangular in outline, deeply pinnatifld into lance-oblong pinniE, 

 which are enth-e or wavy-toothed, or the lowest pair sinuate-pinnatifid (decaying 

 in autumn) ; veins reticulated with fine meshes. (Name apparently from ovos, 

 a vessel, and kXcio), to close, from the singularly rolled up fructification.) 



1. O. sensibilis, L. — Moist or wet places, along streams; common. 

 July. —A rare abnormal state, in which the pinn* of some of the sterile fronds, 

 becoming again pinnatifid and more or less contracted, bear some frui^dots 

 without being much revolute or losing their foliacoous character, is the var. 

 OBTuai-i-OEiLTA, Ton: N. Y. State Fl. (Yates County, New York, Sartwell, 

 and ■Washington County, Dr. Smith. New Haven, Connecticut, D. C. Eaton.) 

 This explains the long-lost O. obtusilobata, Sdikuhr (from Pennsylvania), which, 

 as figured, has the sterile fronds thus 2-pinnately divided. (Ragioptcris, Presl. 

 is founded on a young fertile frond of this species and the sterile frond of some 

 different Fern.) 



