Var. p. Homomalla. Theden. 



Stems short, laxly pulvinate, olivaceous, green above, fuscous below. 

 Leaves ovate or oblongo-lanceolate, more or less falcato-secund, obtuse. 



Syn. — Andr. rupcstris Web. & Mohe, Smith, Hook., C. Muell. et plur. auct. cit. sub forma 

 typica. 



Andr. petrophila Var. y. homomalla Theden. in Nya. Bot. Not. 1849, p. 79, fig. 48-54. 

 ScHiMP. Syn. Muse. 661, et 2 ed. 813. Zetterst. Mon. Andr. Scand. 43. 



Hab.— Glen Callater, Braemar (Hunt) ! ! Castel-y-Gwynt, Carnarvon at 3000 ft. (Beckett 

 1880) ! ! 



This appears to be a form rather than a variety, as the secund dis- 

 position of the foliage is found more or less developed in varieties differing 

 widely in other respects. The obtuse, obliquate apex of the leaf and large 

 size of the upper cells may prove more characteristic. It seems to be only 

 sparingly distributed both here arid on the continent. 



Var. y. Acuminata. Schimp. 



Plants more robust, olive green or blackish. Leaves spreading, lo.nger 

 and more acuminate, with longer papillae. 



Syn. — A. petrophila Var. ^. acuminata Schimp. B. E. vi, Mon. 13, t. II, /8 I Synops. Muse. 

 661, et 2 ed. 813. 



Hab. — Rocks on the higher mountains. 



Glen Callater, Braemar (Fergusson 1868) ! ! Ben Maedhui (Hunt 1871) ! ! Cader Idris 

 (Pearson 1876) ! ! Strachan, Kincardine, and RonaU hill, Shetland (Sim 1878) ! ! 

 Slaek of Birnie, Fourdoun (Sim) ! ! Ben Nevis, at 4000 ft. abundant (George 1879) ! ! 

 Abergynalwyn (Whitehead 1879) I ! 



Closely allied to the varieties robusta, flaccida and sylvicola, and perhaps 

 with them only constituting one good variety characterized by the taper- 

 pointed leaves. 



Var. S. Flaccida. Schimp. 



In soft, black tufts, with branched, flexuose stems. Leaves squarroso- 

 patent, lanceolate, pointed, rather obtuse. 



Syn. — A. petrophila Var. y. flaccida Schimp. B. E. vi, Mon. i3,t. II, y; Syn. Muse. 661, et 

 2 ed. 813. 



Hab. — Roeks in Glen Callater, Braemar (Hunt 1871) I ! Canlochan (Hunt 1868) ! ! 



This is a more robust plant than the Var. alpestris, which it somewhat 

 resembles in the form and direction of the leaves, but these in the dry state 

 are widely divergent or even subsquarrose, and also of a larger size. 



Var. i. Sylvicola. Schimp. 



In small, lax tufts, short, slender, decumbent at base. Leaves small, 

 partly secund, rather distant, longly lanceolato-acuminate, acute. 



Syn. — A. petrophila Vai. €. syhicola Schimp. B. E. vi, Mon. 13,1. II, ej Syn. Muse. 661, et 

 2 ed. 813. 



Hab. — Ben Maedhui, Glen Callater and Loch Kandor (Hunt 1871) ! 1 



