OF SOUTH AUSTRALIA. 
*9 
HALISERIS Targ. Tozz. 1819. 
(= Neurocarpus Web. and Mohr. 1805, and Dictyopteris Lamour. 1809.) 
Frond erect, flattened, many times dichotomous. Two strata of cells, the 
inner more or less rectangular, empty and colourless, the outer (cortical) 
cubical and densely coloured ; to form the midrib the inner stratum is 
thicker and compacted. There are present spores, often in great profusion,, 
but their nature has not been sufficiently determined. 
KEY TO THE SPECIES, 
a. No veins running from the midrib to the margin, 
b. Spores scattered over the frond. 
c. Segments entire H. polypodioides 
Tasmania. (Desf.) Agardh. 
cc. Segments denticulate II. W oodwardia 
North Queensland. R. Brown and J. Agardh. 
bb. Spores forming a cloud-like patch, con- 
tinuous from midrib to margin. 
Muciferous glands scattered over the 
surface H. Muelleri Sonder, 
South coast of Australia, Tasmania, 
bbb. Spores forming a linear band on each 
side of the midrib as in Blechnum. 
Muciferous glands arranged in 
recurved arches from midrib to 
margin H. aerostichoides 
Victoria, Tasmania, east coast of Australia. J. Agardh, 
bbbb. Spores in sori disposed in arches curving 
obliquely backwards from the midrib 
to the margin. To 30 em H. pardalis Harvey, 
West and North-west Australia, 
bbbbb. Spores as in preceding. Very near to 
II . pardalis , with stouter midrib, and 
more evolved. To 60 cm II . crassinervia Zan. 
Lord Howe Island. 
aa. Veins running from midrib to margin. 
d. Veins extremely numerous, crowded fine 
and delicate (spores not observed) H. australis Sonder. 
South Australia (Lcfevre Peninsula, 
Mueller), North Queensland, 
dd. Veins conspicuous (spores in linear sori 
on each side of the midrib, 15 to 20 
cm. high) H. plagiogramma 
Lord Howe Island, Brazil, West Indies, Montagne. 
and the Sandwich Islands. 
