21 



Filaments 30 — 40 u., not tapering, not clavate, here and there toru- 

 lose, green to fulvous brown, but often collapsed and colourless. 

 Rhizome erect. Frond large brownish-green, rotundate, cuneate 

 at base, very obscurely zonate A. canariensis (p. 34). 



Filaments 20 — 30 ju,, rarely 1 5 >j. at apices, cylindrical, sometimes 

 slightly torulose, either colourless or full of brown contents. 

 Rhizome erect. Frond medium size, brown, stipitate, irregular, 

 zonate, eroded above, sometimes lobed A. Elllottii (p. 35). 



Filaments 20 — 30 p., not tapering, markedly torulose, colourless 

 with sparse green contents, sometimes stained pale brown ; apices 

 slightly tortuous, free. Rhizome suberect, long, stout. Frond 

 very large, zonate, green . A. Gar diner i (p. 36). 



Filaments 25 — 6 a, tapering, markedly torulose, colourless with 

 sparse green contents, sometimes stained pale brown ; apices 

 tortuous or hooked. Rhizome stout, bearing two or more fronds. 

 Frond shortly stipitate, medium size, brown A. pacifica (p. 37). 



Filaments 25 — 6^., tapering, cylindrical; apices often slightly toru- 

 lose, generally not tortuous ; filaments of interior often yellowish- 

 brown. Fronds many and arising from a common base A. lacerata (p. 38). 



a. Fronds small, thin, cuneato-obovate, lacerate, green, borne 



on slender stalks forma typica. 



b. Fronds crowded, cordato-rotundate, subsessile, stouter, larger, 



usually entire, brown, subsessile . . . . . . forma robustior. 



Filaments 35 — 6 a, tapering, cylindrical, here and there torulose, 



rarely submoniliform, yellow to dark brown, not or very slightly 



tortuous at apices. Plant subsimple, cinereous. Frond stipitate, 



of medium size, subrotundate A. sordida (p. 40). 



Filaments 25 — 1 5 y., rarely tapering to 6 ( a, torulose towards apices, 



which are very tortuous, branched, irregularly swollen, hooked 



and felted together into a pseudo-cortex. Rhizome stout, bearing 



a few or many fronds on branched stipites. Frond green or brown. A. amadelplui (p. 42). 



a. Fronds short, numerous, densely congregated on a thickened 



base, thick, much eroded forma Montagneana. 



b. Fronds few, large, entire, subrhomboid-rotundate, with 



cuneate to rounded base. Stipes long, branched . forma suèmersa. 

 Filaments 30 — 20 u., tapering to 15^. or iopi torulose towards 

 apices, which are very tortuous, branched, irregularly swollen, 

 felted together into a pseudo-cortex. Plant simple, dark olive- 

 green to greyish. Frond large, thin, oblong-reniform with cor- 

 date base, entire, zonate. Stipes long, simple A. asarifolia (p. 44). 



