HYPNUM. 481 



and H. scorpioides, also very distinct in its robust habit and very- 

 large, rugose leaves. 



Angular cells thin-walled, large, hyaline, forming distinct, 

 not inflated, decurrent auricles H. ochraceum 



Angular cells more incrassate, large, pellucid, hyaline or rich 



orange-brown, forming very distinct, inflated auricles 



H . eugyrium 



Angular cells more or less incrassate, granulose, not h) - aline, 



forming ill-defined, more or less opaque or orange auricles 



H.palustre, H. arcticum, H. molle, H. dilatatum. 



f Ls. large, roundish, swollen on one side ; nerveless or shortly 2-nerved . ... 

 I-j 32. scorpioides 



\\ja. not ventricose, usually smaller 2 



/Ls. widely ovate or roundish, apex usually obtuse or apiculate 3 



\ Ls. ovate or ovate-lanceolate, more or less tapering towards apex 6 



/Ls. about \ line long, roundish 4 



3\Ls. about I line long 5 



/Ls. serrulate, nerve usually short and double .jj>. niicans 



4\Ls. entire or nearly so ; nerve usually single 2g. arcticum 



/Ls. widely ovate, slightly tapering to bluntish points, soft 28. molle 



5\Ls. sub-orbicular, firmer, subsecund 28* dilatatum 



,{ Angular cells large, thin, hyaline ; dioicous y/. ochraceum 



\ Angular cells more or less incrassate, or opaque 7 



/Angular cells pellucid, usually orange; nerve faint, double 30. eugyrium 



' \ Angular cells obscure, granulose ; nerve single or double 2j. palustre 



27. Hypnum palustre L. (Amblystegium palustre Lindb.) 



(Tab. LIX. B.). 



Very variable, usually slender, frequently more robust, 

 variously coloured, dark green, reddish, or dull yellowish green, 

 rarely bright green. Stems more or less prostrate, usually much 

 denuded at the base ; branches usually more or less numerous, 

 erect or ascending, often curved, or hooked at the tip; forming 

 low, usually irregular and untidy patches. Leaves very variable, 

 imbricated all round the branches, rendering them julaceous, or 

 more frequently secund, often distinctly and sometimes strongly 

 and regularly falcate, always concave, with the margins incurved 

 especially towards the summit, so that the leaves can never be 

 flattened out without tearing ; more or less oval-oblong, \-\ 

 lines long, very variable above, rounded and obtuse or apiculate, 

 or more .frequently tapering (especially in the secund forms) to a 

 longer or shorter obtuse or acute point, but never narrowly and 

 longly acuminate, and usually very short and sub-obtuse ; 

 decurrent at base, entire at margin ; nerve very variable, usually 

 PI 



