18 FLORA. 



Stipes obscurely jointed near the base; cilia of the indusium inflexed over the 



sporanges. 



Leaves with more or less rusty chaff underneath. I. W. Ilvensis. 



Leaves glabrous or nearly so. 



Leaf lanceolate, not tapering below ; pinnae cordate-ovate, 5~7-lobed. 



2. W. alpina. 

 Leaf linear or linear-oblong, often tapering both ways; pinnas deltoid. 



3. W. glabella. 

 Stipes not jointed ; cilia of the indusium very short, hidden by the sporanges. 



Puberulent ; indusium deeply cleft, ending in hairs with cylindric cells. 



4. W, scopulina. 

 Leaves and stipes glabrous ; indusium divided to centre into beaded hairs. 



5. W. Oregana. 

 Indusium distinct, at first enclosing the sporanges, splitting into jagged lobes. 



6. W. obtusa. 



1. Woodsia Ilvensis (L.) R. Br. (I. F. f. 16.) Rootstock short, csespitose. 

 Leaves lanceolate, 10-25 cm. long, glabrous above, more or less covered with rusty 

 chaff beneath, as are also the slender stipes; pinnae crowded, sessile, pinna tely 

 parted, the crowded segments oblong, obscurely crenate; stipes jointed near the 

 base; sori borne near the margins of the segments, somewhat confluent when old; 

 indusium minute, concealed beneath the sorus, its margin cleft into filiform seg- 

 ments, which are inflexed over the sporanges and inconspicuous, especially when 

 mature. On exposed rocks, Lab. and Greenland to Minn., south to N. Car. and 

 Ky. Also in Europe and Asia. 



2. Woodsia alpina (Bolton) S. F. Gray. (I. F. f. 17.) Rootstock short, csespi- 

 tose. Leaves narrowly oblong-lanceolate, 5-15 cm. long, 15-25 cm. wide, scarcely 

 narrower below ; pinnae cordate-ovate or triangular-ovate ; pinna tely 5-7-lobed, 

 glabrous or very nearly so on both surfaces ; stipes jointed near the base ; sori some- 

 what scattered on the segments; indusium as in the preceding species. On moist 

 rocks, Lab. to Alaska, south to N. B., N. N. Y. and W. Ont. 



3. Woodsia glabella R. Br. (I. F. f. 18.) Rootstock small, csespitose. Stipes 

 obscurely jointed at the base; leaves linear or lanceolate, 5-12 cm. long, 8-15 mm. 

 wide; pinnae deltoid to ovate, the lower remote, obtuse, crenately lobed, often 

 somewhat smaller than the middle ones, glabrous or nearly so; sori scattered on 

 the segments ; indusium minute, membranous, with 6-10 radiating segments, 

 covered by the sporanges, its filamentous segments only inflexed over them when 

 young. On moist rocks, Lab. to Alaska, south to N. H., Vt., N. N. Y. and 

 the north shore of L. Superior. Also in arctic and alpine Europe and Asia. 



4. Woodsia scopulina D. C. Eaton. (I. F. f. 19.) Rootstock short, densely 

 chaffy. Stipes 5-10 cm. long, not jointed, puberulent like the rachis and lower 

 surface of the leaf with minute flattened hairs and stalked glands; leaves lanceolate, 

 12-25 cm. long, tapering from about the middle to both ends; pinnae numerous, 

 oblong-ovate, pinnatifid into !O-l6 oblong toothed segments; indusium hidden 

 beneath the sporanges, very deeply cleft into short cilia with cylindric cells. In 

 crevices of rocks, N. Minn, and W. Ont. to Or., south in the Rocky Mts. to Ariz., 

 and in the Sierra Nevada to Cal. Summer. 



5. Woodsia Oregana D. C. Eaton. (I. F. f. 20.) Rootstock short. Stipes 

 and leaves glabrous ; stipes not jointed, brownish below ; leaves 5-25 cm. long, 

 elliptic-lanceolate, the sterile shorter than the fertile ; pinnae triangular-oblong, 

 obtuse, pinnatifid; lower pinnae reduced in size and somewhat remote from the 

 others ; rachis straw-colored ; segments oblong or ovate, dentate or crenate, the 

 teeth often reflexed and covering the submarginal sori ; indusia minute, concealed 

 by the sporanges, divided almost to the centre into a few beaded hairs. On rocks, 

 N. Mich., Minn, and Manitoba to Br. Col., south in the Rocky Mts. to Ariz., and 

 in the Sierra Nevada to Cal. July-Aug. 



6. Woodsia obtusa (Spreng.) Torr. (I. F. f. 21.) Rootstock short. Stipes not 

 jointed, pale green, 7-15 cm. long ; leaves broadly lanceolate, 15-40 cm. long, 

 minutely glandular-pubescent, nearly 2-pinnate; pinnae rather remote, triangular- 

 ovate, or oblong, pinnately parted into obtuse oblong crenate-dentate segments ; 

 veins forked and bearing the sori on or near the minutely toothed lobes; indusia 

 conspicuous, at first enclosing the sporanges, at length splitting into several jagged 

 lobes, which are much wider than those in any of the preceding species. On 



