71 DICKSONIA. 



(liisia (lii|)lici:i sonnn aniplectentia : cxterim e denticulo 

 ohtuso coucavo inflexo in sinu pinnul;c ; inlevina opposilum, 

 c- nii'iiibrana seniicirculari intej^ra, plicata, pallida." 



t21. I). ? Madirf/iisrar/ensis, Kzc. ; " frond membranaceous 

 tripinnat()-i)innati(id liairv on cacli side at the veins, primary 

 l)inna' ovato-obloni;, secimdary alternate subsessile unequally 

 ovato-oblong falcate acuminate, i)innules unequally oblong 

 deeply ])innatifid, segments shordy oblong obtuse inciso-cre- 

 nate, son of the crenatures intramarginal rounded, interior 

 involucre semi-lunate, rachis hairy, secondary margiucd." 

 Kzc. Anal. Pti'r. p. 38. 



Hab. ^[a^lapasc:lr, whence very iiicomplcte portions have been brought 

 by M. (ioudot. — Kunze is verydonbtful about the genus of this plant. 

 It woiihl api>oar, from tiie descriptioTi of the involncre, to belong to the 

 Ii(ilaiitium-'j^iit\\\^, if a Dicksoitia at all. 



Subgen. II. Patania. Involucres cup-shaped or subcampanulate. 

 Patauia, Pr. Dicksonia,* Pr. Sitolobium, Desv. 



(Ultimate divisions or pi time lar(/e, more than an inch tony. Sp. 25 — 29^. 



25. D.Pd ran i,lloo\i.; fronds amjde bi})innate,pinnfe sessile 

 broadly oblong acuminate pinnatifid about half-way down, 

 up])er ones obtuse coadunate, segments or lobes broad short 

 rotmded slightly margined nearly entire and pubescenti-ci- 

 liate, son 1 — G in the sinuses chiefly on the upper margin 

 rather small at length shallow cup-sliaped membranaceous, 

 rachis soun;what zigzag and as well as the costa downy. 

 (Tab. XXVI. A.) — Davallia arborescens, Willd. Sp. PL v. p. 

 470. Plii7n. Fit. p. 7, t. 6. 



Hub. Hispaniola, Phunier. Peru, Ruiz and Puvon, in Herb, nostr. — I 

 think there can be little doubt of the figure of Phunier belonging to this 

 species. If so, the stem is arborescent; '"3 feet high and 6 inches in 

 diameter;" aiul that is the authority for Davallia arborescens, Willd., which 

 seems to be hitherto only known from Plumier's figure and description. 

 It is ])robably extremely rare. Piumier found it in only one spot in St. 

 Domingo, and the single specimen that has come under my observation is 

 fnun the herbarium of Ruiz and Pavon. The pinna are f) — 6 inches long, 

 and at the base H inch l)road. 



20. D. coiicinna, Hook.; "fronds bipinnate glabrous, pin- 

 nules alternate linear-lanceolate attenuato-acuminate deeply 



* I am aware that Presl considers a 2-valved involucre as a character of 

 his Dicksonia ; but I do not find it in the species he brings under that ge- 

 nus, nor do his figures represent it so, any more than those of his Patania. 

 Probably, owing to pressure of the specimens, or from the opening of the 

 involucre being transverse, an appearance of two short lips may be given ; 

 liut I do not think tiial it is so in reality. 



