312 KEY TO THE GENERA. 
KEY TO THE SPLEENWORTS. 
(Asplenzum.) 
Fronds pifinatifid or pinnate below, apex lony tapering. 
Blade thick, lobes rounded. . Ay pinnatifidum. 
Blade thin, lobes pointed . ‘ A, ebenotdes. 
Fronds pinnate. 
Rachis green or straw-coloured. 
Less than six inches high, ‘ . A. viride. 
Taller, pinnz long pointed . A angustifolium. 
Rachis dark. 
Pinnules not eared at base . «dA. Trichomanes. 
Pinnules eared at base. 
Mostly opposite 5 : A. parvulum, 
Mostly alternate : F A. ebeneum, 
Fronds more than once pinnate. 
Stipes green, blades inclining to triangular 
pinnules fan-shaped. A.ruta-murarta, 
Stipes darker below, blade longer and 
Narrower. % ‘ A, montanum., 
Stipes and rachis dark. A, Bradleyz, 
(See, also, Athyrzum.) 
KEY TO.CHEILANTHES. 
Fronds nearly smooth : e ‘ C,. Alabamenszs. 
Fronds hairy, twice pinnate ‘ : . C. vestita, 
Fronds tomentose, thrice pinnate. 
Very small species, stipe nearly smooth. = C. danugznosa, 
Larger, stipes tomentose : : C. tomentosa, 
KEY TO WOODSIA. 
Stipe not jointed. . i 3 HW’, obtusa, 
Stipe obscurely jointed near the base, 
Frond more or less chaffy $ : HW’. Ilvensis, 
Fronds smooth or smoothish. 
Pinne ovate, deeply pinnatifid I, elabella. 
Pinnz rounded ovate, 5-7 lobed. IT”, hyperborea. 
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