72 DICKSONIA. 



not very distinct, yet that it is sufficiently so to detenniue that this plant 

 cannot be confounded with Davallia ; — whereas Kauliuss remarks, on Ins 

 species, that "it possesses the habit of Dicksonia, but the fructiiication ol 

 Ddvallia." 



15. D. ahrupla, Bory ; candox creeping scaly, fronds lan- 

 ceolate iiinnate, pinna; sessile lanceolate doubly scn-ated 

 bruad and collate or truncate at tbe base, upper ones fertile 

 nanower acuminated, involucres along the whole margin up- 

 on short broad teeth coriaceous dark brown rcniform, outer 

 valve largest and convex, inner nearly plane operculifonn.— 

 Bonj, Voy. r. ii. p. 187, /. 30. Stv. Syn. Fit. p. 138. Hook. 

 Gen. Fil. t. C, B. Lcptopleuria, Prefil. 



Halt. Bourbon, amongst scorite and lava, Bimj, Carmicliael. — V'mns: 3 

 —4 inches long, an inch broad at the base of the lower ones. Veins copi- 

 ous, parallel. 



16. D. sorbifnlia, Sm. ; fronds bij^innate, pinnae subpetio- 

 late acuminate serrated especially towards the apex truncate 

 at the base, fertile ones narrower margined with fructifica- 

 tions, involucres subglobose membranaceous, outer valve cu- 

 eullate, inner small and nearly plane, rachis and costa hirsute. 

 (Tab. XXV. A.) — Sm. in llecs Cycl. v. vii. D. Moluccana, 

 II all. Cat. n. 2174. Cystodium sorbifolium, J. Sm. — Hook. 

 Ccn. Fil. I. 96. 



II ab. Isle of Honimoe, E. Indies, Mr. C. Smith. Moluccas, Herb. Rox- 

 (jur</h. — Evidently allied to D. abrupla, but more compound, with much 

 suKiller pinna;, distant veins and different involucres. 



17. D. Plia/iieri, Hook.; fronds trijunnate ample glabrous, 

 pinn;e subpetiolate broadly lanceolate acuminate deeply pin- 

 natilid cuneate at tlie base, the segments oblong acute or acu- 

 minate crenate the teeth everywhere bearing sori, involucres 

 suborbicular deeply 2-valved membranaceous, outer valve 

 convex at lengtli cucullate and covering the nearly plane 

 smaller inner one. — Davallia adiantoides, Stv. Syn. Fil. p. 131. 

 IVilld. Sp. PL V. V. p. 469. D. Domingcnsis, Sj>r. Anl. v. iii, 

 /J. 149,/. 33. Cibotium, Pr. Microlepia, J. 5'w. — Plum. 



Fil. L 7. 



ilab. St, Domingo, Plumier. Jamaica, Wifes, Wrirjht, McFadycn, Ban- 

 croft. l>ominica. Dr. Imray. — Apparently a large-growing Fern, with am- 

 ple fronds and copious fructifications. Tliese latter arc almost intermediate 

 between Damllia and Dichsonia : the outer valve, at first only a tootli or 

 small lobe of the frond, afterwards becomes convex, thinner, and linally of 

 nearly tlie same texture as the inner one, which it frequently involves as 

 with a hood. The difficulty of determining tlie genus of this plant may be 

 inferred from the several genera in which it has already l)ecn placed. 



18. D. T/milcni, Hook.; frond tripinnate ami)le glabrous, 

 piinue narrow-lanceolate acuminate pimiatifid, segments Ian- 



