216 CRYPTOGAMIA FILICES. [CI. 24. 



branched. Fructification close to the leaves, globular, blackish, 

 resembling pepper-corns, but downy. 



480. ISOeTES. Quill-wort. 

 1. I. lacustris, 16. 1084. (European Q., Merlin's grass,) Fronds 

 bluntly quadrangular, with four longitudinal cells. 

 Alpine lakes. If. 5, 6. Stem 0. Fr. awl-shaped, tufted, 3—9 in. 

 Seeds pure white. 



