164 THE JOURNAL OF BOTANY 



11 (Stips. large, bipartite, with entire segments Kunzeana 



jStips. absent, or, if present, minute and awl-shaped 12 



22il^eaves nearly parallel to stem, acutely |-bilob«d, minute ...Pearsoni 



*" (Leaves patent or erecto-patent, ^-bilobed or less 13 



/■Leaves imbricate, lobes unequal, usu. rounded, post, lobes closely 



13 j tiled saxicola 



I Leaves approximate or distant, upper lobes equal, usu. pointed 14 



/'Stems little or not radiculose, lobes of lower leaves unequal ; on rocks 



j^J or among mosses minuta 



I Stems densely radiculose, lobes of lower leaves equal ; on decaying 

 \ wood HelUriana 



1g (Both margins of leaves retlexed orcadensis 



(Both margins of leaves not retlexed 16 



jgf Stipules usually present 17 



( Stipules absent 18 



/■Lobes obtuse, oval or rotundate, sinus gibbous, reflexed obtusa 



17j Lobes m. or 1. triangular, some usu. acute hantriensis 



i (Stips. few or none in var. acuta.) 



-jg jLobes rounded, usu. obtuse 19 



(Lobes acute 20 



/Leaves obovate or subrotund, dark green ; in wet places injiata 



19- Leaves m. or 1. quadrate, with larger cells, light green ; on limestone 



twrhinata 



20 'Upper leaves 3-5-lobed, undulate 21 



I Upper leaves rarely more than 2-lobed, not undulate 22 



(Paroicous; stem thin, plant usu. light green cajntata 



(Dioicous; stem very thick, plant bluish green incisa 



/Leaves closely imbricate, nearly erect, sinus acute; stem less than 



1 I in. long hicrenata 



j Leaves not closely imbricate, patent or erecto-patent, siuus obtuse ; 



' plant larger 23 



I' Sinus notably variable in shape, upper leaves quickly incurved when 



2gJ drying; plant commonly brown alpestris 



I Sinus not very variable, leaves slowly incurved when drying; plant 

 ( commonly green, or stems red ventricosa 



(^.\ Stems usu. with cylindrical innovations ijracilis 



( Stems without such innovations 25 



^K ! Stipules present 26 



(Stipules usually absent 28 



2g (Leaves about as long as broad, lobes usu. o, incurved Flcerkii 



(Leaves broader than long, lobes usu. more than 3 27 



(Leaves nearly transverse, very concave, with incurved lobes ; margin 

 of lobes notably reflexed, sinus gibbous qiiadriloba 

 Leaves oblique, not concave nor with incurved lobes, lobes usu. 

 mucronate lyco^jodioides 



<^Q (Leaves flat, nearly horizontal harhata 



\ Leaves undulate, oblique or transverse 29 



(Lobes of leaf obtuse, leaves concave, usu. saccate at base, embracing 

 the stem polita 

 Lobes of leaf acute 30 



Stem very thick ; leaves nearly transverse, ant. margin not reflexed, 



oQj about equal in length to the post, margin incisa 



Stem thinner ; leaves oblique, post, margin curved, longer than the 

 usu. reflexed ant. margin Lyoni 



21 



22 



