﻿10 I. CYATHEACEAE. 



h.b.b. Indusium spurious, consisting of a minute scale placed at the 

 inner side of the receptacle or of a circular, entire or lohed 

 scale or a whorl of fibres with the receptacle in the centre. 



No. 5. Al§iophila. 



a.a. Sori exindusiate. No. 5. AliSO|»bila. 



f.f. Sori terminal on the veins. DICKSONIEAE. 



*. Indusium 2-valved, the outer valve consisting of an unmodified, 



cucullate lobe of the frond, forming with the inner valve a saccate 



involucre to the sorus. No. 4. Di^ksonia. 



*.*. Indusium 2-valved, the outer valve like the inner one, distinctly 



differentiated from the margin of the frond, both forming a saccate 



involucre to the sorus. No. 5. Cibotium. 



