272 SOME ADDITIONAL JAMAICA FERNS. 
P. Hartii, n. 
dark brown reticulated scales. Stipites tufted, few ‘slender, from 
hardly any clear to 41. long. Fronds erect, linear, apes a 
to apex and base, 3-5 in. long, 2-8 1. wide, almost fully pin 
Segments ~~ close rene rounded at the end, the base cunaeale 
te, 1-14 1. long, the same breadth at both ends, 
but the reduced een ones ‘deltoid, achis filiform, covered under 
the parenchyma on see sides, oe prominent beneath, stiff. 
Texture tibaciade surfaces slightly — on the margins 
or naked, dark <i ‘but paler beneath ; mple vein in each 
segment, "that do oes not reach the apex. ‘Suits cet ES on the 
veins, sunk in a cavity which forms a ridge on the upper side of 
the a the sides of which are pofiexed, but do not cover 
them.—This and the next species form a distinct group, i sf 
the sorus ae elongated, and a in a depression of the 
nerved lobes. Found also in minica. 
— Roo isiuick very small and short, clothed 
with rather squarrose | reti oritnted scales. Stipites — filiform, 
erect, dark, slightly ciliate or naked, 3—} = long. Fronds ies 
ear, tapering both to apex and base, 8- in. long, aa wi 
pinnatifid almost to the stifish thread-like Ste which is coved 
by the parenchyma on the upper side, but not beneath. Segments 
obliquely aticted-obilciiy aces 5 shortly decurrent, Ath bk long; 
less wide, blunt. Texture firm; surfaces naked or the margins 
and rachis beneath slightly ciliate, dark or brownish green, paler 
beneath. Veins simple in the lobes, not reaching the points. 
Sori roundish or rather elongate, medial on the veins, superfici 
or slightly depressed. 
.o ee Mett. 
449. Thomsonii, n.sp. — Rootstock stout, upright, often a few 
Aa high. Stipites cxespitose, erect, 1-2 ft. long, brown, clothed 
downwards with membranaceous brows scales, and mucous when 
coloured. spreading, numerous, contiguous above, sub- 
distant below, sessile, with a subulate eland at the base beneath, 
6-8 in. long, 1- ot ag wide, oblong-lanceolate, acuminate, with a 
serrato-entire point, the 2-3 lower — reduced half or more, and 
often deflexed, pinnati ifid to bells line of the coste. Segments 
numerous, close, straight, linear-oblong and round-ended, continents 
but not dilated at the panakodes base, 6-7 1. long, 14-21. w wide, 
at, with entire margins. Texture thin, membrano-chartaceous, 
ucid. Surfaces nearly naked, ous or ciliate on the 
ashe and ribs, and y glandulose beneath; colour pale but 
ivid green. Veins simple, slightly oblique, pellucid while fresh, 
— 12-15 to a side. Sori medial or nearer the midrib, brown, con- 
stantly distinct, at length dispersed. — Near P. decussatum L. ani nd 
P. Percivalii Jenman. It commemorates the name of Mr. Ro bert 
Thomson, to whom belongs the credit of forming th Cinchona 
o, ‘Plantations and the several branches of the Botanical Department, 
= — the Old Old Bath Garden, of which a puecanat still exists. 
