— 350 — 



below the terminal one, 12 — 15 cm. long by 3 1 /2 cm. broad at the middle, 

 pale yellowish-green beneath, the margins dentate throughout, the abruptly 

 acuminate apex serrulate, unequally cuneate at base, the upper (inner) 

 side nearly parallel to rachis, the lower cuneate; some minute scales on 

 the flattened midrib beneath. Veins simple or more often once or twice 

 furcate; short recurrent veins present. Sori well within the margin with 

 13 — 16 sporangia. By its long-stalked pinnæ with few but proportionally 

 very broad pinnæ of a yellowish-green colour it seems to deserve a name 

 of its own; I propose to name it A. siamensis n. sp. 



