FILICES. 



123 



subtripinnate ; pinnae spreading or spreading-ascending, straight ; all 

 the pinnse obtuse or subobtuse, very rarely acuminated ; basal pinnules 

 of the lower pinnae contiguous obovate or ovate or rhombic-ovate, 

 lobed or incised or pinnatipartite ; ultimate segments ascending, 

 obtuse or crenate-serrate or dentate serrate towards the apex ; teeth 

 often no longer than broad, subacute, very shortly acuminate and 

 subacute or very shortly mucronate. 



Var. y. Serpenfini. Koch. 



A. Adiantum-nigruin, var. obtusum, Moore in Journ. Bot. 1861, p. 129. Hook. fil. Stud. 



Fl. ed. ii. p. 493 ; Hook. & Bah. Syn. Fil. ed. ii. p. 214. 

 A. Serpentini, Tausch. Fl. 1839, p. 477. Milde, Fil. Europ. p. 86. Babenh. 1. c. No. 115. 

 A. obtusmn, Presl, non Kit. (teste Milde). 



Stipes as long as the lamina, or often exceeding it, more con- 

 spicuously margined than in vars. a, /3, and y. Lamina coriaceous 

 or subcoriaceous, opaque, scarcely shining but with a faint satiny 

 lustre, ovate-triangular or triangular, gradually acute, tripinnate or 

 subquadripinnate ; lower pinnae ascending-spreading or spreading, 

 straight, rarely slightly curved towards the apex of the frond, 

 subacute, very rarely acuminated ; basal pinnules of the lower pinnae 

 separated, rhombic deltoid, pinnate or subbipinnate ; ultimate 

 pinnules or segments ascending-spreading, wedgeshaped at the base, 

 obtuse or subobtuse and crenate-dentate at the apex, with the teeth as 

 long as or longer than broad. 



Var. (?) y. acutum. Pollini. 



Plate 1875. 



A. Onopteris, var. a. acutum, Milde, Fil. Europ. p. 87. 



A. Adiantum-nigrum, var. Virgilii, Heufler, Willk. & Lange, Prod. Fl. Hisp. Vol. I. p. 7. 



A. acutum, " Bory, MS." Willd. Spec. Plant. Vol. V. p. 347. Newm. Hist. Brit. Ferns, 



ed. iii. p. 230. 

 A. Virgilii, Guss. Fl. Sic. Syn. p. 662. 

 A. productum, Lowe, Trans. Camb. Phil. Soc. 1838, p. 524. 



Stipes generally much exceeding the lamina. Lamina subcoriaceous, 

 translucent, faintly shining with a strong satiny lustre, ovate- 

 triangular, longly acuminate, almost cordate, mostly tripinnate or 

 subquadripinnate ; lower pinnae spreading-ascending at the base, and 

 then curved upwards towards the apex of the frond, acuminate and 

 very acute or subacute ; basal pinnules of the lower pinnae much 

 separated, narrowly rhombic or rhombic-triangular, pinnate or sub- 



