452 ACOTYLEDONOUS PLANTS. 



rounded, pinnalifid; segments rounded, unequal. Poly podium hyper' 



boreum WUld. 



HAB. Rocks. Can. and N. S. July. 14.. Resembles the pre- 

 ceding, but is sometimes quite small, and differs in having the 

 pinnefe as well as the segments more rounded and less deeply 

 pinnatifid, except at their base, where the bottom pair of seg- 

 ments are often so deeply separated as to form two little pin- 

 nules. 



3. W. rufidula Beck : frond bipinnate ; pinnules hairy, oblong, ob- 

 tuse, pinnatifid, with obtuse segments ; sori at length confluent ; stipe 

 and rachis hairy. Aspidium rufiduliim and Jt'oodsia iiccnsis Purzh. 

 Nephrodium rufidulnm Mich. Ji'oodsia iiccnsis? Biff. Richardson's App. 



HAB. Rocks. Subarc. Amer. to Car. July. 2^. Fern C 8 

 inches high. Stipe dark brown, densely clothed with lighter 

 coloured woolly hairs. Frond decidedly bipinnate in full grown 

 specimens, hairy on both sides. The W. iiccnsis and hyperborea 

 of Brown resemble each other closely. This differs from botli in 

 its bipinnate frond and in its hairy instead of scaly stipe, rachis 

 and frond. 



4. W. perriniana Hook, ft Grev. : minutely glandular-pilose ; frond 

 bipinnate ; pinnules pinnatifid ; segments rounded, bidentate ; sori 

 submarginal ; involucre subhemispheric, at length with dentate spread- 

 ing segments ; spike somewhat chaffy. Also phila perriniana Spreng. 

 Hypopeltis obtusa Torr. Aspidium obtusum Willd. Piirsh. 



HAB. Rocks. N. Y. to Car. ; . rather rare. July, y. Fern 

 8 10 inches high, erect. Stipe straw coloured. Sori at length 

 much crowded together. Habit similar to the Woodsias, " and 

 except that the involucre is larger in proportion to the sorus, 

 and that in the young state it covers more fully the capsule, 

 and is not margined with hairs, there is not a difference even in 

 the characters of the fructification." Hook. 4* Greo. Icon, t'ilic. 



5. ASPLENIUM. Linn. 



Sori linear, transverse, scattered. Involucre arising from 

 the lateral veins and opening towards the central nerve or rib. 



* Frond undivided. 



1. A. rhizopJiyllum Willd. : frond lanceolate, stipitate, subcrenate, 

 auriculate-cordate at base, the point very long filiform and rooting. 



b. pinnatifidum Muhl : fronds pinnatifid at base ; lobes roundish- 

 ovate ; the lower ones crenate. A. pinnatijidum Nutt. 



HAB. Wet rocks. Can. to Car. July. !. Fronds several 

 from the same root, 6 10 inches long, somewhat triangular, 

 with a very long and linear point, which is bent to the ground 

 and strikes root. Var. b. passes into the former by scarcely 

 perceptible variations. 



** Frond pinnate. 



2. A. angustifollum Mich. : frond pinnate ; pinnte alternate, upper 

 ones subopposite, linear lanceolate, serrate towards the point, some- 



