A. W. Evans — North American Species of Frnllania. 21 



Lobes acute or obtuse ; underleaves strongly crispate at base ; 

 bracts more or less dentate ; innermost bracteole free. 



15. F. Tamarisci. 



Lobes obtuse or rounded ; underleaves not crispate at base ; 

 bracts entire or slightly dentate ; innermost bracteole usually 

 free. 14. JP. Asagrayana. 



Underleaves plane or nearly so. 



Lobes marked with a distinct line of discolored cells ; under- 

 leaves entire on the sides, sometimes auriculate at base ; stylus 

 a conspicuous disc-like process; stylus of lobule of bract a 

 distinct segment. \4c. F. Asagrayana. 



Lobes marked with a distinct line of discolored cells ; under- 

 leaves often unidentate on the sides, never auriculate at base ; 

 stylus small or minute ; stylus of lobule of bract not distinct, 

 replaced by a cluster of fine laciniae or cilia. 



13. 7^ Franciscana. 



Lobes with or without scattered discolored cells ; underleaves 

 entire on the sides ; stylus minute ; stylus of lobule of bract 

 a distinct segment. 16. J^. Calif ornica. 



12. Frullania Nisquallensis Sulliv., Mem. Amer. Acad., new series, iv: 175. 1849. 



Plate X. 

 Dioicous : plants robust, growing in broad, depressed tufts, red- 

 dish-brown, usually tinged with yellow or green : stems mostly 

 bipinnate : leaves imbricated, the lobe ovate, arching over the stem 

 and cordate at base, strongly reflexed at the acute or acuminate apex, 

 margin entire ; lobule separated from the stem by about its own 

 width, oblong-clavate ; stylus minute and subulate or sometimes a 

 small disc-like process : underleaves distant or contiguous, orbicular 

 or reniform, strongly reflexed, at least at the apex, bifid about one- 

 fourth with obtuse lobes and sinus, auriculate at base : leaf-cells of 

 lobe rather thick-walled, trigones and intermediate thickenings 

 becoming prominent towards the middle ; discolored cells usually 

 absent, sometimes occurring on the leaves of ultimate branchlets : 

 ? inflorescence terminal on a short, lateral branch ; bracts in about 

 three pairs, deeply and unequally bifid, the lobe ovate, acuminate, 

 entire, sinuous or very sparingly dentate on the margin, lobule 

 subulate, often distorted or uncinate at the acuminate apex, revolute 

 on the margins, bearing on the inner side towards the base an indis- 



