al 
. 
Lindsaya.} FILICES. ~ 619 
16. LINDSAYA, Dryand. 
Sori intra- or submarginal, laterally elongate, interrupted or continuous, 
mostly linear, placed on the laterally expanding apices of veins or — these 
expansions uniting — on the marginal anastomoses of two or more other- 
wise free or anastomosing veins. Involucre transverse on the apex of the 
vein or on the marginal nerve, its external margin free and mostly even 
with the often scarious margin of the frond, the sides free or slightly 
adnate. — Tropical or subtropical ferns, with exarticulate stipes and a 
tendency to form dimidiate cultrate or, cuneate segmen nts. — Areoles of 
anastomosing veins hexagonal, war free veinlets (nervatio Doodyae 
rm a connected group, ge inoresting 
: iian speci ende 
inasmuch as it exhibits a twofold line of scvaloomast seri a 
sided pinna with sphenopteroid areolate veins, on the 0 oes rome Sits 
with the cuneate flabellately veined segments of pression sa bbee or the linear 
single-veined segments of Stenoloma, Fée, 0 Loxoscaphe, Moore wee on the other side 
a bipinnate form in which the pinnules are shaped like 
All hav short t or prostrate caudex and 
glossy, almost terete stipites, the br a r groove being so shallow as to Geeeene 
e as. ‘le single, nearly central, in shape of an oblique cross with two 
arms s er. Pinnae very numerow start at an acute angle e midrib, 
Ww i short obtuse pinnae ses itself b the apex. e ad 
entire pinnae of nos. 1—3, and whenever isk occurs in nos. 5—7, the veins anas s 
© sets of oblique elongate areoles, the api of which send out veins which 
either unite again near the margin s 
reaching them, and serve for the reception of the s As areoles e given angle 
ca. in broad disks they disappear in te geen pinnae of no. and the 
pinnules of nos. 5—7, which have onl a nastomosis, and this latter also 
becomes impossible where the segment contains only a single nerve, ar 
a But even here t of the single nerve expands laterally, and 
when exceptionally it forks in the segment the tw veinlets unite again with i 
e transition Alecandri with cuneate truncate segm to L. Knudsenit 
with cuneate -lanceolate nts is quite evident by the gradual elongation of the 
median vei the former species, which bees of deliquescent costule — 
transitio: more remarkable as there exists a bipinnate variety of the 
former with e cate pin or poe 
e evolution finally of a bipinnate form h pinnules a to the pinnae . 
finds its explanation in the change 0 imple nervatio 5 to a nervy. Neu- 
mes an excurrent 
f a 
ropteridis in the very broad disks of L. laciniata. The I g 
i most vertical pectinate aioe. which gradually 
in the eae var. 
e sori are interrupted and distinct intra-margina metimes at a distance from 
hat the free margin of the ee falls short of the es er, 
ever Cie he n color nor becomes scariou 
re, to the ring. res in at speci 
Bsaipn oi slig! se rnag 
The habitus of rhe t frond in the com| und ada 8 faintly polystehol from the 
base of the pinnae. In the simple forms with sessile pinnae the first - segments 
posi | u stands 
al mn 
rangia on ig stalks with abou t 20 
are odr 
nearer the main rhachis than the second lower. 
parallel to or arcuate to ward the rhachis; 
recedes from it. 
e entire: 
te at the base; sori distant from the margin SL. erecta. 
7) 
Frond narrowing below; sori submarginal : : 
Pinnae ovate-rhomboidal, obtuse, less than 1‘ long 1. L. pumila. 
