1 64 
The Ferns of South Africa . 
in size, as some plants have fronds six inches high with as many 
as twenty-five segments one inch long, while other fronds on same 
plants are only one inch high with quarter-inch long segments. 
Other specimens have similar medium-sized fronds, but along with 
them stronger fronds, divided into about sixteen segments three 
inches long. A specimen in Herb. Gub. has on a three-inch stipe 
a frond of nine linear segments, three to four inches long, and one 
line broad, the fertile infolded, not toothed at the tip, but sharp 
pointed. That form is Acrostichum australe, Linn. 
Actiniopteris radiata. Link. Sp. 79 ; Hk. and Bkr. Syn. Fil. 246. 
Blechnum radiatum. Presl. tab. 103 ; Pappe and Rawson, 16. 
Acrostichum dichotomum. Forsk, fl. oeq. Arab, (oldest name). 
Pteris dichotoma. Kuhn, Fil. Afr. 79. 
Acrostichum radiatum. Koenig. 
Asplenium radiatum. Sw.; Kze. Linnsea, 24.259. 
South Asia, and throughout Africa, south to Transvaal. 
Transvaal. — Magalisberg (Burke and Zeyher, 532 ; Todd, Zeyher, No. 
1874) ; Limpopo (H. M. Barber) ; near Eurika City in the Sheba 
Mountains, Barberton (Dr. C. M. Vowell, 1888). 
Griqualand. — (R. Moffatt). 
Matebeleland. — Devil’s Kantour, Tati (J. Fry, 1887). 
Bechuanaland. — Kuruman (Rev. J. Brown). 
Genus XX. — Didymochla:na. Desv. 
Sori reniform or elongated, attached along its centre to the 
intramarginal raised end of a vein, which forms a linear elevated 
receptacle, and covered by a reniform or elliptical indusium, 
attached along its length to the vein, and free all round the edges 
and upper end, but emarginate at the base. This genus consists 
of only two species, distinguished from Aspidiumand Nephrodium 
by its elongated receptacle. 
93. Didymochlena lunulata. Desv. 
Plate LXXXVIII. Natural size. 
Stem erect, sub-arborescent, paleaceous. Frond coriaceous, 
two-pinnate, three to five feet long, one to two feet broad, with 
