64 smith's fern. 



generally stipitate and pinnatifid ; the remainder are sessile and 

 pinnatifid : an obtuse angle is formed at the union of the first 

 pair of pinnse with the stipes and rachis ; lateral veins in the 

 ultimate divisions usually simple : clusters of capsules circular, 

 forming a suhmarginal series : involucre generally wanting : 

 colour dull green, somewhat glaucous. 



Polypodium Dryopteris, Bolt. Fil. Brit. 53, 1 ; Newm. F. [cd. 

 1), p. 20 ; Lecleh. Fl. Ross. xiv. 509. 



Polypodium Robertianum, Hoffm. Dcutschl. Fl. ii. 10 ; Koch, 

 Syn. (ed. 2), 974 ; Fries, Summa, 82 ; Moore, 55. 



Polypodium calcareum, Sm. Fl. Brit. 1117, E. F. iv. 288, 

 E. B. 1525 ; Newin. F. 181 ; Franc. 24 ; Hook, and Am. 

 567 ; Bab. 409. 



Lastrea calcarea, Bori/, Diet. Class. d'Hist. Nat. ix. 232 ; 

 Neivm. N. A. 17. 



Lastrea Robertiana, Newm. F. 13. 



Gymnocarpium Robertianum, Neivm. Phyt. iv. 371, ^jjj). 

 xxiv. 



We are indebted to Bolton for first noticing and describing 

 this fern, which he treated as a variety of Polypodium Dryopte- 

 ris. " I have observed," says tliis author, " a variety of this 

 plant growing in White Scars, near Ingleton, and in the Peak 

 of Derbyshire, wherein the rib is taUer, more firm, hard and 

 robust, white and opaque ; the leaves larger, the number of 

 parts greater, and the largest of the lobes are again partly lobed, 

 or divided down half-way to the middle rib : this variety I have 

 figured, tab. 1, fig. 1." The plant, however, was first named 

 and characterized as a species by Hoifman, who describes it in 

 these words : — " Polypodium Robertianum. Fronde triangu- 

 lari, foliolis ternis bipinnatis ; pinnis pinnulisque inferne pin- 

 natifidis. Stipes glaucus, uno latere sulcatus. Frons tenera. 

 Uterque nudo oculo subtili tomento, ad lentem hrcvissimis glan- 

 dulis obsitis. Odor debilis Geranii Robertiani. Fructif. 

 minuta." — Hoffm. Deutschl. Fl. ii. 10, date 1795. Sir J. E. 

 Smith, in 1804, redescribed the species under the name of Po- 

 lypodium calcareum; see Flor. Brit. p. 1117. His subsequent 



