320 CHARACTERS OF TRIBES AND GENERA. 



dum, Presl. When the ultimate segments are small, the 

 sori are short, and become characteristic of certain Davallece 

 of authors, which Mr. Moore has characterised as a distinct 

 genus under the name of Loxoscaphe, but as the habit of 

 these species is clearly indicative of their affinity being 

 with the present group, I consider them as a section of 

 Asplenium, as follows. 



The principal character that entitles them to rank as a 

 genus, consists in the sori being very short and oblique, 

 with the indusium conniving with the margin of the seg - 

 ment, which gives it the appearance of a round cyst open- 

 ing outwards as in Davallice, which is the only character 

 that gives it any claim of relationship with that family. 



8. GIBBEROSUM GROUP (Loxoscaphe, Moore). 



A. gibberosum, /. 8m. (Davallia, Sw.) ; A. concinnum, 

 J". 8m. (Davallia, Schrad.) ; A. Schimperi, /. Sm. (Davallia, 

 Hook) ; A. theciferum, /. Sm. (Davallia, H. B. K.) ; A. 

 foeniculaceum, H. B. K. 



9. ADIANTUM-NIGRUM GROUP (Tarachia, Pr.) 

 Fronds bi-tripinnate ; ultimate segments or lacince with two 



or more sori. 



A. Adiantum-nigrum, Linn, (v v.) ; A. lanceolatum, Huds. 

 (v v.) ; A. acutum, Bory. (v v.) ; A. auritum, Sw. (v v.) ; 

 A. dispersum, Kunze (v v.) ; A. macilentum, Kunze (v v.) ; 

 A. fragrans, Sw . (v v.) ; A. mexicanum, Mart, et Gal. (v v.). 



10. FALCATUM GROUP (Tarachia, Pr.). 

 Fronds pinnate ; pinnae I to 6 inches long, lanceolate or ellip- 

 tical, acuminate or sub-deltoid, entire, serrated or erosely 

 laciniated veins forming an acute angle with the costce. 

 A. attenuatum, R. Br. (v v.) ; A. longissimum, Blume 

 (v v.) ; A. nitens, Sw. (v v.) ; A. serra, Lang, et Fiscli. 



