468 



Benedict: The genus Ceratopteris 



ovate-lanceolate, blunt or acute, 1-2.5 cm - l° n g» 2_ 5 rnm. broad : 

 fertile leaves taller than the sterile, the lamina oblong, 20-55 cm - 

 long, 10-30 cm. broad, 2-5 times pinnately divided, the pinnae 



FIGURE I. Ceratopteris thalictroides (L.) Brongn., Lamao River, Mt. Mariveles, 

 Prov. Bataan, Central Luzon, Philippine Islands, A'. S. Williams 2gg. About one 

 third the natural size. 



and smaller divisions often distant, the ultimate segments flagelli- 

 form, 1-6 cm. long, the margins revolute, covering 2 or 3 rows of 

 areolae, and 1 or 2 rows of sporangia with well -developed annulus 

 and lip-cells : spores 32. [Figure i.] 



