tertiary pinnula of the typical form. Several specimens seen which correspond to the 
characters of A. cafocarpum seem in reality to be younger, not full-grown plants of 
. the genuine form. Besides the differences in size and cutting I find no essential 
differences in the minute characters, and I therefore here prefer to unite all these 
forms under one species. 
D. nemophila is distributed along the Andes from Northern Argentina. Peru and 
Bolivia to Venezuela; I have seen no specimens from Central America. In B are to 
be found fragments of this species said to be collected in Mexico and Brazil, which 
is an error, I think. — Specimens examined: 
Peru, Panatahuas province, Ruiz nr. 69 (B= Pol. amplum Kl. Linn. 20: 389); near Tarapoto, Spruce 
-nr. 3942 (Kew); without locality, MarHEws (B). 
Argentina, prov. Jujuy, Quinta pr. Laguna de la Brea, in palude, Ros. E. Fries nr. 222 (Rg). 
Bolivia: Polo-Polo near Coroico, Yungas, O. BucuTien nr. 3597, 3599, 3608 (R); Tres Cruces, HenzoG 
nr. 1581 (R) (all f. catocarpa). 
Ecuador: between Bafios and Pintuc, Pastaza valley, Sripex nr. 920, 948 (B); Pallatanga valley, 
Soprro (RB); S. Miguel de los Colorados and St. Domingo, Sopiro nr. 115, 144 (Budapest). 
Colombia: without locality, LinpEN nr. 1020 (Kew, B, Budapest), 1033 (B= catocarpa); near La Plata, 
SripeL nr. 1261 (B); Péramo de Moras, Stéset nr. 1270 (B). 
Venezuela: Caracas, LinpEN nr. 124 (Kew, RB): Gottmer (B); Moritz nr. 37 (B= A. furcatum K1.); 
Tovar, Moritz nr. 435 (B, RB); Fenpier nr. 204 (Kew) — all f. catocarpa. 
4. Group of D. subincisa. 
This group includes about thirty known species, most of which are large, 
decompound, some of them veritable tree-ferns with a trunk 1—2 m high. From 
the former groups this is marked especially by the rather thick texture of the leaf, 
its generally dark green colour and the pubescence. D. grandis and D. adenopteris 
excepted all species have the cost and costules above strigose by antrorse whitish 
or brownish, subulate and often falcate, rather stiff and long hairs, below which 
most often common Ctenitis-hairs are to be found, and most species are more or less 
pubescent either by short unicellular, common hairs or pilose by long, flexible, 
paucicellular but not articulated, whitish hairs. The scales are few or many, nearly 
always clathrate with toothed margins, sometimes entire, most often rigid, castaneous. 
The basal scales rarely form a large tuft as in D. ampla, mostly so in D. Karsteniana 
and D. connexa. 
In circumscription the lamina of the tripinnatifid species is deltoid-ovate or 
deltoid with the lower pinnz the largest and produced downwards. Most species 
show a characteristical feature, by which they can easily be distinguished from 
D. ampla and its allies. In the tripinnatifid lamina the basal posterior tertiary seg- 
‘ment are nearly separated from that above it and broadly adnate to the costa of 
the pinna; its midvein runs out from the costa often 1—2 mm from the base of 
8* 
