CRYPTOGAMIA. FILICES. 25 1 



from Onoclea, of which there is another species in Eu- 

 rope. 



822. ASPLENIUM, Z. (Spleen-wort.) 



Sori linear, transversal, scattered. Indusia 

 arising from the lateral veins, and opening to- 

 wards the rib. 



Species. 1. A. rhitophyllum. 2. * pinnatijldum. Fronds 

 lanceolate, stipitate, pinnatifid, point attenuatedj not taking 

 root? lobes roundish ovate; sori larger, at length conflu* 

 ent. Hab. In the crevices of rocks on tlie banks of the- 

 Schuylkill, rare. v. v. also in Tennessee; always perfectly 

 distinct from A. rhizophyllum to which it was apparently 

 referred by Muhlenberg, Catal. p. 97. the frond is less 

 atienuated, pseudopinnate at the base, the sori occupying 

 nearly the whole disk of the lobes, being also much lar- 

 ger and very prominent, 



3. angiistifoUiim. Fertile frond separate. 4. eheneiim. 

 Hab. From Canada to Florida, also in Louisiana. 5. me" 

 lanocaulon. 6. thelypteroides. 7- JRuta muraria. 8. mon- 

 tanum. 



A large genus extending throughout Europe, and 

 North America as far as the West Indies; there are also 

 species in New Zealand. 



S23. SCOLOPENDRIUM. Smith. (Hart's- 

 tongue.) 



Sori linear, transversal, scattered. Indusium 

 double, superficial, occupying either side of the 

 sori, opening almost like a longitudinal fissure. 



Frond entire or muUifid. 



Species. S. officinariim. 7). v. In the westem parts of 

 the state of New York, in the crevices of calcareous 

 rocks, beneath the shade of the Hemlock Spruce (Mies 

 canadenniSyJ and accompanying the Tax-us canadeimis or 

 American Yew. 



824. PTERIS. L. (Brake.) 



jSoH continuous, linear, marginal. Indusium 

 from the inflected margin of the Irond, opening 

 inwards. 



St TiCiTS. 1. v. pedata. Q. atropurpnrea. Also indige- 

 nouB to Louisiana. 3. i^racilit. 4e. caudoia. 5. aqiiiiina> 



