HYPNUM. 457 



rich golden brown or golden green, dark within. Leaves 

 crowded, recurved-squarrose from a more erect base, hardly 

 altered when dry, widely ovate or ovate-rounded with a rather 

 abrupt, short, acute acumen, minutely denticulate all round, 

 slightly recurved at basal margin, nerveless or with a very faint , 

 short, double nerve ; cells rather short, 6-10 times as long as wide, 

 linear, obtuse ; at angles few, sub-quadrate, not very conspicuous. 

 Seta short, about f inch ; capsule small, \ line long, more or less 

 curved, constricted below the mouth, reddish purple with a 

 somewhat glaucous tinge, especially when young. Autoicous. 



Hab. Alpine rocks ; very rare ; Ben Lawers ; Ben Cruachan. Fr. summer. 



A very distinct and pretty little species, in very dense low patches, and at once 

 characterised by the colour, and by the very squarrose, recurved leaves, which have 

 much shorter points than in the allied species, and therefore give a quite different, more 

 compact aspect to the stems and branches. On the continent it is fairly common and 

 fruits abundantly. 



B. HARPIDIUM. 



Leaves usually large, strongly falcate or circinate, rarely 

 only slightly falcate ; nerve single, reaching half-way, usually 

 much higher, often strong. Bog plants, or growing in wet places 

 on rocks. 



[All the British pleurocarpous mosses with strongly falcate, 

 acuminate leaves having a long single nerve belong here, with the 

 exception of some forms of Amblystegium filicinum. with strongly 

 curved leaves, recognised at once by the short, wide, sub- 

 hexagonal cells. Hypnum palustre and H. ochraceum never 

 have the leaves finely and longly acuminate.] 



In the following arrangement I have made great use of 

 Renauld's elaborate monograph of the European Harpidioid 

 Hypna in the Muscologia Gallica, although with some slight 

 differences from that work. 



/Leaves not (or only faintly) plicate when moist 2 



1 \ Leaves distinctly plicate when moist 9 



/Leaves not (or scarcely) auricled 3 



2 \Leaves with distinct auricles 5 



{Ls. wide, concave, crumpled and rugose when dry g. lycopodioides 

 Ls. little altered when dry 4 



/ Robust, reddish ; leaves with long acumen yj. revolvens 



4 ^Slender, yellowish or green ; acumen shorter 13*. intermedium 



fAnguIar cells swollen, hyaline 6 



■5\Angular cells incrassate, yellowish 8 



(Annulus present ; ls. usually ovate-lanceolate, entire ; nerve not reaching high in 

 acumen ■ 7. aduncum 

 Annulus absent ; ls. longly lanceolate, finely toothed at base and apex ; nerve 

 running far into acumen 7 



