154 ACOTYLEDONS. FiLiCEs. Aspidium, 



** Fronds subbipinnate, or bipinnatiftd. 

 -f Involucres dimidiate, reniform. 



2. A. Oreopteris, fronds pinnate, pinnae lanceolate glabrous re- 

 sinoso-glandulose beneath pinnatifid, the segments lanceolate 

 obtuse entire, lowermost ones longer, sori marginal. E. B. 

 t. 1019 (Poly podium Orcopteris). 



3. A. Thelypteris, fronds pinnate, pinnae linear-lanceolate pinna- 

 tifid glabrous, the segments ovate acute entire, sori marginal 

 contiguous at length confluent. Polypodium Thelypteris, 

 Lightf.p.674. E.B. f.509. 



HAB. Marshes and bogs, abundant. 



4. A. cristatum, fronds pinnate, pinnae subcordate oblong pin- 

 natifid, the segments oblong obtuse dentato-serrate, stipes 

 chaffy. E. B. 1. 2125. Hook, in PL Land., tilth afgure. 



HAB. Native of Scotland, Smith in E.B., under t. 1949. 



5. A. aculeatum, fronds bipinnate, pinnules rigid ovate sublunate 

 acuminate aristate oblique and cuneate at the base and decur- 

 rent, themarginsfaintlyserrated spinulose, with atooth near the 

 base on the upper side, stipes and rachis chaffy. E. B. 1. 1562 

 (margin of the pinnule not good). Polypodium aculeatum, 

 Lightf.p.675. 



HAB. Woods, Rosslyn and Kinross-shire, Mr. Arnott. Bute, &C., 

 Mr. Murray. Stobhall, &c., Mr. Young. 



I describe this and the following from English specimens /and can- 

 not be sure that the Scotch are the same. To me they appear de- 

 cidedly distinct. 



6. A. lolatum, fronds bipinnate, pinnules scarcely rigid ovate 

 rather obtuse aristate truncate at the base which has a lobe 

 on the upper margin shortly petiolate, the margin deeply ser- 

 rated and spinulose, stipes and rachis chaffy. E. B. t. 1563 

 (imperfect specimen}. 



HAB. Rosslyn woods, Maugh. Appin, Captain Carmichael. With 

 A. aculeat., Mr. Murray and Mr. Young. 



This has the broadest frond, far less rigid ; and besides the different 

 shape of the pinnules, the present species may be recognised by the 

 truly petiolated pinnules and their deeply serrated margins. 



7. A. Filix mas, fronds bipinnate, pinnules oblong obtuse ser- 

 rated, serratures muticous, sori near the central nerve, stipes 

 and rachis chaffy. E.B. t. 1458, and 1949 (Asp. cristalum). 

 Polypodium Filifcmas, Lightf. p. 671. 



HAB. Woods and shady banks, frequent. 



8. A. dilatatum, fronds bipinnate, pinnules oblong distinct inci- 

 so-pinnatifid, segments mucronato-serrate, stipes chaffy. E. B. 

 *. 1461, and /. 1460 (A. spinulosum}. Polypodium crisla- 

 tum, Ligtitf. p. 670. 



HAB. Woods and wet rocky places, frequent. 



