DESCRIPTIONS OF THE SPECIES 225 
ferns, so the probability is that his specimen also was from 
Rhodesia instead of Namaqualand. 
Genus 30. Cheilanthes Sw. 
Small herbaceous or sub-coriaceous ferns, having small 
round marginal sori on the points of the lobes, or crowded 
all round the edge of the frond, except at the sinuses. The 
sori are terminal on the veins, and at first quite separate, 
though afterwards more or less confluent ; but the indusia 
are roundish and not continuous, but more or less confluent, 
formed of the edge of the frond which is only partly turned 
back. This distinguishes them from Pellaea, but some species 
bear fronds showing the characters of both genera on the 
same plant. From Notholaena they are more difficult to 
distinguish, as the indusium is formed of the reflexed margin 
of the frond, often hardly changed in texture, and sometimes 
only partly reflexed; while in Notholaena, which corresponds 
in habit, the sori are without indusia, though the margin is 
sometimes more or less reflexed. The separation of the ferns 
into indusiate and non-indusiate, which was followed in our 
first edition, is here, as in several other cases, felt to be a 
purely artificial arrangement, as any natural arrangement 
either unites these two genera, or brings them into juxta- 
position. The Cheilanthes are widely distributed, and most 
of the species vary considerably in accordance with sur- 
roundings. 
Synopsis of the species : 
120. C. depauperata. Frond lanceolate, two-pinnate, four to twelve 
inches long, a quarter to half inch broad, glabrous above; pinnae 
deltoid, lobes linear, tomentose on the under surface. 
121. C. hirta. Frond broadly lanceolate, three-pinnatifid, hairy; 
pinnae ovate-lanceolate ; lower pinnae reduced ; frond and segments 
plain. 
Var. contracta. Frond narrowly lanceolate, three-pinnatifid, 
hairy ; frond and segments much infolded. 
122. C. pcirviloba. Frond lanceolate, three-pinnatifid; pinnae lanceo- 
late, glabrous; stipe hairy; pinnules deltoid. 
s. F. s. A. 
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