312 KEY TO THE GENERA. 



KEY TO THE SPLEENWORTS. 



(Asplentum.) 



PAGE. 



Fronds pinnatifid or pinnate below, apex long tapering. 



Blade thick, lobes rounded . . A, pinnatifidum. 167 



Blade thin, lobes pointed . . A. ebenoides. 169 



Fronds pinnate. 



Rachis green or straw-coloured. 



Less than six inches high. . . A.vtride. 158 



Taller, pinnae long pointed . A. angustifolium. 188 



Rachis dark. 



Pinnules not eared at base . A, Trichomanes. 155 



Pinnules eared at base. 



Mostly opposite . . A. parvulum. 159 



Mostly alternate . ' . A. ebeneum. 160 



Fronds more than once pinnate. 



Stipes green, blades inclining to triangular 



pinnules fan-shaped. A, ruta-murarta. 162 



Stipes darker below, blade longer and 



narrower . . . A. montanum. 164 



Stipes and rachis dark. A. Bradleyi. 166 



(See, also, Athyrium) 



KEY TO CHEILANTHES. 



Fronds nearly smooth . . . C. Alabamensis. 242 



Fronds hairy, twice pinnate . . . C. vestita. 237 

 Fronds tomentose, thrice pinnate. 



Very small species, stipe nearly smooth. C. lanuginosa. 240 



Larger, stipes tomentose . . C. tomentosa. 239 



KEY TO WOODSIA. 



Stipe not jointed W. obtusa. 96 



Stipe obscurely jointed near the base. 



Frond more or less chaffy . . W. Ilvensis. 93 

 Fronds smooth or smoothish. 



Pinna? ovate, deeply pinnatifid . W. glabella. 99 



Pinnae rounded ovate, 5-7 lobed. W, hyperborea. 98 



