40 1. CYATHEA. 



somewhat compressed, bisulcate down the face, clothed with dark, 

 subadpressed hairs between the grooves, the lower side asperous with 

 very minute, acute warts. Pinnulae linear-lanceolate, short-stalked, articulate 

 to the rachis, the largest 12 — 15 cm. long, 2 cm. broad, truncate at the 

 base, acuminate at the deeply serrate apex, the edge cut + ^/j -way down 

 to the costa. Segments falcate-oblong, 7'', mm. broad, blunt, more or 

 less crenate to deeply and sharply serrate towards the often spinuloso- 

 apiculate apex. Texture coriaceous ; costae hairy above ; costae and costulae 

 provided beneath with moderately long, dark, acute, scattered, firm hairs ; 

 veins 5^7 on a side, naked, forked or the higher simple, arcuate-ascending. 

 Sori remote from the costulae, at the forkings of the veins, 3—7 on a 

 side, not occupying the higher veins, the lower divaricating; indusium 

 globose, the base persistent, at length saucer-shaped, the mouth irregular 

 or irregularly incised. 

 Polillo Island. 



3. HEIMITELIA, «. nrown. 



§ 2. AMPHICOSMIA. 



i, Costae (tertiary rachises) beneath hairy and scaly. 



A Costulae beneath rather densely hairy and scaly, at least in the 



lower half. (4) H. sumatrana. 



A A Costulae beneath not densely hairy and scaly. 



O Pinnulae pinnatifid. 



V Pinnulae to 2 cm. broad. (4a) H. caudipinnula. 

 VV Largest pinnulae more than 2 crn. broad. 



(4&) H. barisanica. 

 OO Pinnulae pinnate, at least at the base. 



V Pinnulae to 1 '/^ cm. broad. (4c) H. confluens. 

 VV Largest pinnulae more than I'/i '^'"'- broad. 



{id) H. salticola. 

 l.f. Costae (tertiary rachises) beneath naked, hairy or scaly. 



S. Main rachis distinctly muricate or aculeate, at least toivards the base. 

 o Indusium indistinct, represented by a minute scale hidden 

 under the sorus. . . ,. 



