104 
THE FERNS OF SOUTH AFRICA 
acute lanceolate segments inch broad. Veinlets simple, 
1 4 — 15-jugate. Sori medial. Indusium fugacious, mem- 
branous, glabrous. Zambesi Highlands, Buchanan ” 
Baker places it next to D. orientalis in the group which 
has the lower pinnae hardly if at all reduced. It is unknown 
to me, but appears to differ from all other South African 
species in having the pinnae cut quite to the rachis into long 
narrow lobes. 
D. zambesiaca (Baker). C. Chr. Ind. 301, 1905. 
Nephrodium zambesiacum. Baker, Ann. Bot. 5, 318, 1891. 
Aspidium zambesiacum, Hier. 1895. 
27. Dryopteris elongata (Sw.) Sim. 
Plate 17. Pinna, nat. size. 
Rhizome short, procumbent or sub-erect, densely palea- 
ceous, with large, ovate, pointed, scarious, yellowish brown 
scales. Frond deltoid, herbaceous, four-pinnatifid, one to 
four feet long, one to three feet broad, with a stout rounded 
stipe one to two feet long, which is abundantly paleaceous 
toward the base, and with scattered large scales upward, as 
also on the rachis and secondary rachises. Pinnae widest at 
the base ; lower pinnae much the largest, unequally deltoid, 
having larger pinnules on the lower side ; secondary pinnae 
lanceolate or ovate-lanceolate ; the larger ones cut below into 
separate, ovate, sharply toothed pinnules, which are closer 
or confluent above. Smaller pinnae cut only halfway to the 
mid-rib; pinnules and segments all rounded, and with several 
sharp-pointed teeth, of which one pointing upward is generally 
largest. Sori numerous, rather large ; indusium not hairy. 
This species is much stronger growing than the next, and 
when fully mature is easily distinguished ; but young plants 
are difficult to separate. The frond is more triangular in 
outline, the lower pinnae are largest, the colour of the under- 
side is less glaucous, and the rhizomes do not run, but produce 
four to twelve fronds each. The crown is clothed with large 
yellowish scales, and this is about the only point in which 
this plant resembles the well-known male fern, N. filix-mas , 
