185 237 
rachis. Pinnz opposite or nearly so, sessile 8—9 cm long, 1'/2—2 cm broad acu- 
minate, the basal pair deflexed and narrowed towards their base, the upper ones 
divaricating and broadest at the base, ciliate, the coste above strigose, the upper- 
side glabrous or very slightly and shortly hairy, coste and costule beneath with 
patent, simple hairs, the underside otherwise nearly glabrous. Segments oblique or 
subfalcate, obtuse or subacute, the lower ones of the basal pinnz short. Veins 
simple, 10—11-jugate, the lo- 
wer 2 running to the sinus, 
where their apices are se- 
parated by a pale mem- 
brane. Sori medial, with a 
pilose, persistent indusium. 
Sporangia glabrous. 
The diagnosis above is 
of the original specimen. 
With this agree a large num- 
ber of specimens from South- 
ern Brazil in almost all cha- 
racters, although I have not 
seen another specimen, which 
exactly matches the original 
one, but it is sure that all 
these specimens belong to 
the same species, which is 
evidently very common from 
Rio to Rio Grande. Several of 
the specimens were labelled 
Nephrodium tetragonum Hk. 
resp. Dryopteris pseudotetra- 
gona Urb., others Polypodium 
tetragonum. From the an- 
dine form of the former as 
previously understood, now 
D. gemmulifera Hieron., D. 
scabra differs by the short pinnatifid apex of the lamina, from the latter, which it 
resembles in habit and colour, by its free veins, sessile pinne and its pinnatifid 
apex without a distinct terminal pinna. 
D. scabra is a very variable species; the specimens seen can be grouped as follows: 

Fig 32. D. scabra (Pr.) C. Chr. leg. Ponr. Basal pinne, middle pinna 
and apex of leaf >< */;; segments seen from both surfaces >< 11/2. 
var. incompleta (Lindm.) 
Syn. Polypodium tetragonum var. incompletum Lindm. Ark. fór Bot. 1: 229 
tab.9 fig. 7. 1903. 
Dryopteris pseudotetragona var. foecunda Rosenst. Hedwigia 46: 119. 1906. 
D, K. D, Vidensk, Selsk. Skr., 7. Rzekke, naturvidensk. og mathem, Afd. X. 2, 31 
