484 HYPNACE/E. 



29. Hypnum arcticum Sommerf. (Tab. LIX. E.). 



Resembling a small form of H. dilatatum ; slender, branches 

 more or less erect or ascending, rigid, forming firm, compact 

 tufts of a dull rusty brown, blackish below. Leaves imbricated 

 all round the stem, not secund, very small, hardly £ line long, 

 sub-orbicular or very widely oval, rounded and obtuse or very 

 broadly and obtusely pointed at summit, concave, minutely and 

 almost obsoletely denticulate at margin, nerve usually single, 

 stout, reaching about half-way, more or less ; more rarely short 

 and double. Cells very short, incrassate, the median linear- 

 elliptic, flexuose or sigmoid, obtuse, 4-6 times as long as wide, at 

 margin and apex shorter and more opaque, those at apex shorter 

 and very wide, ovate-rhomboid ; angular very few, incrassate, 

 sub-rectangular, opaque, forming very small and indistinct, 

 usually orange auricles. Capsule small, short, horizontal. 

 Autoicous. 



Hae. Wet rocks and in streams on high mountains ; very rare. Ben Lawers - r 

 Ben Challum ; Clova. Fr. summer. 



A distinct and extremely rare species, quite different in the form of its leaves- 

 from all but H. molle, H. dilatatum, and H. micans ; from the two former the size 

 alone at once distinguishes it, apart from the long nerve, short cells, rigid habit, etc. 

 H. micans is entirely different in habit and colour, as well as in the serration and 

 structure of the leaves. 



30. Hypnum eugyrium Schp. (Limnobium eugyrium B. & S. ;: 



Amblystegium eugyrium Lindb.) (Tab. LIX. F.). 



Stems prostrate, branches numerous, erect or ascending, or 

 procumbent, forming low dense tufts, rather firm and compact, 

 bright green or reddish, often variegated with brown and yellow, 

 glossy. Leaves rather widely spreading when moist, more or 

 less secund ; more erect when dry, but loosely imbricated and 

 concave, rendering the branches turgid : oval-oblong, shortly 

 narrowed to a rather rounded apex with a more or less abrupt, 

 straight, acute, rarely obtuse apiculus ; narrowed but not 

 rounded at base ; very concave, often incurved at margin above, 

 entire or minutely denticulate at apex ; nerve short, faint, double ; 

 cells rather short, linear, obtuse or pointed, thin-walled, 8-10 

 times as long as wide ; remaining uniform to base, short at the 

 extreme apex ; at angles suddenly large, inflated, the inner 

 incrassate , the outer thin-walled, hyaline or rich orange-brown, 

 forming very clearly -defined, distinct, slightly inflated auricles^ 

 Capsule short, oval or oblong, inflated ; annulus present, 

 Autoicous. 



