THE BRITISH FERNS. 
THE RIGID BUCKLER FERN. 
LASTREA RIGIDA. 
L. fronds elongate triangular or lanceolate, bipinnate, glandular ; 
pinne tapering; pinnules oblong, blunt, lobed, the segments broad 
rounded, two- to five-toothed, the teeth not spinulose; indusium 
convex, persistent, fringed with glands. [Plate XXXIX.] 
LASTREA RIGIDA, Presl, Tent. Pterid. 77. Deakin, Florigr. Brit. iv. 99, fig. 
1607. Babington, Man. Brit. Bot. 4 ed. 422. Newman, Hist. Brit. Ferns, 
2 ed. 191. Moore, Handb. Brit. Ferns, 3 ed. 114; Id., Ferns of Gt. Brit. 
Nature Printed, t. 18. Sowerby, Ferns of Gt. Brit. 22, t. 11. 
PoLYPODIUM RIGIDUM, Hoffmann, Deutschl. Fl. ii. 6. 
POLYPODIUM FRAGRANS, Villars, Hist. des Pl. Dauph. iii. 849 ; not of Linneus 
or Hudson. 
PoLYPODIUM VILLARSII, Bellardi, App. Fl. Pedem. 49. 
Poryropruw HELIOPTERIS, Bérkhausen, Rim. Archiv. Bot. i. 19; according to 
‘Weber and Mohr. 
POLYPODIUM ODORATUM, Poiret, Encyc. Bot. v. 541 (excl. syn. Lin. et hab. 
Sibir.) 
ASPIDIUM RIGIDUM, Swartz, Schrad. Journ. Bot. 1800, ii. 37 ; Id., Syn. Fil. 53. 
Schkuhr, Krypt. Gew. 40, t. 88. Hooker, Supp. Eng. Bot. t. 2724. Hooker 
& Arnott, Brit. Fl. 7 ed. 585. Bentham, Handb. Brit. Fl. 680. Lowe, 
Nat. Hist. Ferns, vi. t. 91. Fries, Sum. Veg. 82. Flora Danica, t. 2187. 
Willdenow, Sp. Plant. v. 265. Sprengel, Syst. Veg. iv. 106. Sturm, 
Deutschl. Fl. (Warrn.) t. 2. Tenore, Att. Accad. del R. Inst. Sc. Nat. Nap. 
v. (reprint 20, t. 2, fig. 4). Fée, Gen. Fil. 291. Mettenius, Fil. Hort. Bot. 
Lips. 93. i 
ASPIDIUM FRAGRANS, Gray, Nat. Arr. Brit, Pl. 9; not of Swartz. 
ASPIDIUM PALLIDUM, Link, Fil. Sp. Hort. Berol. 107. Fée, Gen. Fil. 291. (4 
variety, B.) 
ASPIDIUM NEVADENSE, ‘‘ Botssier ;” Kunze, Ind. Fil. in Linnea, xxiii. 229. 
(A variety, B.) 
AsPIDIUM ARGUTUM, Kaulfuss, Enum. Fil. 242. (A variety, y.) 
ASPIDIUM AFFINE, “‘ Rb.” ; Visiani, Fl. Dalm. i. 39. 
NEPHRODIUM RIGIDUM, Desvaux, Ann. Soc. Linn. de Paris, 261. 
POLYSTICHUM RIGIDUM, De Candolle, Fl. Franç. 3 ed. ii. 560. Koch, Synops. 
2ed. 979. Ledebour, Fl. Ross. iv. 516. 
POLYSTICHUM STRIGOSUM, Roth, Fl. Germ. iii. 86. 
LoPHODIUM RIGIDUM, Newman, Phytol. 1851, App. xxi ; Jd., Hist. Brit. 
Ferns, 8 ed. 175. 
Caudex thick, scaly, tufted, decumbent, formed of the bases of the 
decayed fronds closely surrounding a woody axis. Scales lanceolate 

