82 30 
Specimens seen: 
French Guiana, LEPRIEUR nr. 42 (C, W); RicH (CC); — Demerara, JENMAN (B, €, W). 
Colombia, Cauca, LEHMANN nr. 3802 (B). 
Brazil, Para, Approya, J. Huser nr. 753 (C). — Rio, Grazrou nr. 12373 (B, H). 
Polystichum abbreviatum (Schrad.) Pr. (for synonymy see Index Fil. 575, 
the subspecies excluded) should probably also be placed in this group. It is very 
closely related to D. subobliquata, mainly different by the anastomosing veins. It 
is known from Brazil and also recorded from Guiana and Ecuador. Besides several 
specimens from Brazil I have seen one from Colombia, Córdoba, Dagua Valley, 
30—100 m., H. Pirrier nr. 529 (W). 
Subgenus 3. Ctenitis C. Chr. 
Biolog. Arbejder tilegnede Eug. Warming, p. 77. 1911. 
A natural subgenus including several species all having an erect or oblique 
rhizome, which like the bases of stipes is clothed at the apex with a dense mass 
of scales; these are as a rule very large, toothed at the margin or, more rarely, 
subentire, their apex very long and hairlike; in some species, f. inst. D. strigilosa 
Dav., the scales are long and narrow, dark-brown and rigid. — Lamina bipinnate- 
decompound, as a rule brownish green when dry, membranous or herbaceous, 
rarely coriaceous, not or a little narrowed downwards, more often deltoid and then 
the basiscop pinnule of the basal pinna: are more or less enlarged. Rachis and 
coste. beneath always furnished with many or few scales, which are differently 
shaped in the different species (see fig. 3). Rarely they are quite entire, generally 
the margins are toothed, or, as in D. deflexa, long ciliated; always the apex is 
long and hairlike, and some few long ciliz are to be found at the cordate base; 
in some species the base of the scale is bullate or subbullate. The cells are as a 
rule large and regular, most often rectangular, the inner cell-walls often very 
thickened and dark, while the outer ones are always thin and colourless (clathrate 
scales). The structure and shape of the scales, especially of those of the cost 
beneath are important specific characters. — Besides the scales the species are 
furnished with short, articulate, reddish hairs, which in all species are to be found 
on the coste above; they consist of 2—4 short, cylindrical cells separated by dark, 
thick walls (see fig. 3,1). If hairs occur elsewhere, on leaf tissue, veins or margins, 
they are generally of the same structure. Short, unicellular hairs I have met with 
only in two species, D. platyloba and D. leplosora. Some species are glanduloso- 
pubescent by hairs of a similar structure, but often shorter end ending at a gland. 
Sessile glands as in species of Lastrea scarcely occur. Aérophore none. — Veins 
simple or, in some species, forked, never anastomosing, the basal ones reaching 
the margin above sinus, or, in the less-divided species as D. pedicellata, running 
