Pellaea.) FILICES. 633 
and thus presents itself as an indusium verum in the sense of Presl. The transition 
or thinning of the green frond in the involucre is quite sudden and indicated out- 
wardly by a straight line. 
The youngest fronds — only one pair ee lobulate faleate pinnae besides the long 
and much broader terminal one. In Reda ure as more pinnae develop on the fronds 
the terminal one decreases in relat: 
n pla eset na ies “exhitnti® ype iret fib. vas. — wie lateral ones 
which unite with a transve one under obtuse angles, as is the e with the 
smaller species of Eupteris. ee the ioe fronds the Gren shanks curve ation while 
their angles of union with the transverse portion become rounded off, so as to produce 
the omega shape. 
— 
° 
3 
ae 
77) 
° 
eh 
be | 
° 
Ss 
S 
ae 
- 21. PELLAEA, Link. 
Sori on the upper portions of the veins, at first dot-like or decurrent, 
but soon confluent into an apparently continuous intramarginal line. 
Involucre formed of the more or less changed edge of the frond, quite 
continuous, sometimes very narrow and soon spread open so as to ex- 
pose the entire fructification. — Fronds with generally dark and glossy 
stipites, harsh and rigid, olive-green when Veins generally free 
and indistinct, seldom anastomosing. — <Allosorus, Presl. 
Inhabitants of dry rocky regions in the — and oe t ess chiefly of 
8. Africa, Australia and ar pens coast of Ameri The s is distinguished from 
Pteris by the want of an arginal r ae see Chatunehes og the continuity 
of the involucre, and woe geese nips by the covered s 
1. P. ternifolia, Fée, Gen. Fil. p. 129. — Caudex short and thick, 
branching. Scales brown, linear -falcate, stiff, 3’ long, consisting of a thick 
lack rib and a narrow transparent border, dentate at the apex. Stip. 
close, subterete, 2—4' Jong, dark purplish- brown, naked and glossy. 
Frond coriaceous, rigid, glabrous, linear- lanceolate, 4—8' X 1—1)2', with 
i i hich are cleft to the 
rolled over the sori till full sineutiy. Sporanpia subsessile, the annulus 
hts cells. seri gic giit -globose. One ce semilunar fib. 
. duct. — Hook. Sp. Fil. I, — Fil. Exot. tab. 15. — Synops. Fil. 
Pp. 148, —- Platyloma aii foliists, ai — Allosorus ternifolius, Kze. — 
Pteris ternifolia, Cav. — Pteris verticillata , Sw. 
Maui! Hawaii! Kauai! at altitudes of 5000— ft. Nat. name: <Laukahi». The 
Kauai imens are larger, with pin regal = opposed an an! 
divisions not rolled up, 2” broad an -- The jes extends over the hig 
Andes from Chili to Mexico, and further aan cau through P. Wrightiana, Hook., into 
P. mucronata, Eaton, and P. ornithopus, Hook. 
22. ADIANTUM, L. 
Sori on the upper portions of the veins, globose, oblong or linear, often 
confluent, marginal, covered by an involucre which is formed of the re- 
flexed margin of the frond itself, into which the fertile veins extend, the 
