54 13. DICKSONIA, PATANIA. 



is said to differ from this by its more flaccid fronds, and in the larger teeth of the seg- 

 ments ; and a plant (probably the same) was gathered in Tahiti by the American expe- 

 dition under Captain Wilkes. (See Brackenridge, p. 275.) 



24. D. davaBio&kg, R. Brown ; fr. tripinnate ; lower pinnae 6-9 in. 1., 3-4 in. 

 br. ; pinnl. linear-acuminate, cut quite down to the rachis ; segm. oblong-rhom- 

 boidal, deeply inciso-pinnatifid ; rachis shining, not prickly, glabrous or nearly 

 so ; texture herbaceous, under surface slightly hairy ; sori 2 to 8 to a segment, 

 placed at the base of the sinuses ; invol. subglobose, cup-shaped, ^ of a line across. 

 HL Sp. Fil. I. p. 71. D. nitidula, Kunze, Mett. Fil. Lips. t. 28. 



Hab. Australia, both temperate and tropical. Habit of growth lax, and texture of the 

 frond thinner than in any of the other species. Fronds 2-4 ft. 1. ; lower segments under | 

 in. 1., 2-3 lines br., and finely cut. The Philippine Island D. cuneata (Hk. Sp. Fil. 1. 

 p. 80. t. 28. C.) seems to be a form of this with broader segments than usual. 



25. D. tSmithiij Hk. ; fr. tripinnate ; lower pinnae 9-12 in. 1., 3-4 in. br. ; //*/,(/. 

 linear-acuminate, cut down to the rachis throughout, with rather distant, narrow, 

 acute segments ; lower segm. \ in. 1., 2 lines br. ; rachises slightly inciso-pinnatifid ; 

 and under surface densely tomentoso-glandular ; texture subcoriaceous ; sori 

 2 to 8 to a segment ; invol. subglobose, cup-shaped, J line across. Hk. Sp. Fil. 1. 

 p. 80. t. 28. D. 



Hab. Philippine Islands, Cuming. Rachises similar to those of D. flaccida, but pin- 

 nules narrower and segments much smaller and less divided. 



** Entire frond not more than 12-18 in. long. Sp. 26-29. 



26. D. obtusifolia, Willd. ; rhizome creeping ; fr. 12-18 in. ]., 9 in. br. at the 

 widest part, simply pinnate only, oblong-lanceolate ; pinnae linear, 4-5 in. 1., 

 1 in. br., cut in the lower part f down to the rachis into oblong-quadrangular 

 blunt lobes, with 2 or 3 shallow blunt teeth on each side ; texture membrana- 

 ceous ; rachises tomentose ; sori 2 to 6 to a pinnule ; invol. subglobose, cup- 

 shaped, nearly lin. across. D. Pavoni, Hk. Sp. Fil. 1. p. 74. t. 26. A. 



Hab. Andes of Peru, Barclay. This coincides with D. adiantoides in the shape of the 

 lobes, but is simply pinnate only, so that a single large pinna of adiantoides equals in 

 size and division the whole frond here. 



27. D. scabra, Wall. ; fr. 9-15 in. 1., 6-9 in. br., deltoid or lanceolate, bipin- 

 nate ; lower pinnae 4-8 in. 1., lanceolate ; pinnl. quite distinct, 3-1^ in. 1., \ in. 

 br., the lower ones cut down nearly to the rachis into numerous pinnatifid 

 oblong deltoid segments on both sides ; texture herbaceous or subcoriaceous ; 

 rachis and under surface more or less hairy ; sori 2 to 6 to the lower segments ; 

 invol. cup-shaped, subglobose, ^ line across. Hlc. Sp. Fil. 1. p. 80. t. 27. B. 

 D. deltoidea, Hk.' Sp. Fil. 1. p. 80. t. 27. A. Sitolobium strigosum, J. Sm. 



Hab. India, from the Himalayas to Ceylon, Malayan Peninsula. Stipe sometimes 

 1 ft. 1., asperous, very hairy below ; rhizome wide-creeping. 



28. D. punctilola, Hk. ; fr. 12-18 in. 1., 6-9 in. br., lanceolate, bipinnate ; lower 

 pinnos lanceolate, 4-6 in. 1., cut quite down to the rachis except at the top ; 

 pinnl. ovate-rhomboidal, about \ in. 1., | in. br., deeply pinnatifid ; texture thinly 

 herbaceous ; rachis and under surface more or less glanduloso-pilose ; sori 2 to 

 12 to a pinnule, placed at the base of the simises ; invol. subglobose, cup-shaped, 

 line across. Hk. Sp. Fil. 1. p. 79. 



Hab. Temperate N. America, from Canada southward to Carolina and Tennessee. 



29. D. appendiculata, Wallich ; fr. 12-18 in. 1., 6 in. br., lanceolate, bipinnate ; 

 lower pinnw linear-lanceolate, 3-4 in. 1., cut down quite to the rachis unless at 



