HYLOCOMIUM. 493 



them from Hypnum, and from one another, almost at a glance. 

 The papillae when present are developed from the end walls of 

 the cells, not from their faces as in the Leskeacese. 



/Stem thickly covered with branched green paraphyllia 2 



\Stem without paraphyllia 5 



/Stem closely bi-tripinnate ; Is. imbricate, glossy /. splendens 



\Stem irregularly or distantly pinnate 3 



/Stem-leaves oblong-ovate, imbricate, usually one-nerved 3. pyrenaicum 



^ \Stem-leaves triangular, scarcely imbricate, two-nerved 4 



{Stem-Is. decurrent at base, coarsely serrate ; lid conic 2. umbratum 

 Stem-Is. with rounded base, more finely serrate ; lid beaked 4. brevirostre 



/Ls. transversely rugose 8. rugosum 



' \ Ls. not transversely rugose 6 



, /Stem-Is. deltoid-ovate, very spreading, plicate 7. triquetrum 



\Stem-ls. ovate, recurved, scarcely plicate above 7 



/Ls. squarrose-recurved in all directions 6. squarrosum 



' \Upper ls. more or less secund, plicate at base j. loreum 



1. Hylocomium splendens B. & S. (Hypnum splendens 

 Hedw. ; Hylocomium proliferum Lindb. (Tab. LX. E.). 



Stems long, more or less procumbent and trailing, bright 

 reddish, at least in the younger parts, rigid, robust, clothed with 

 green, subulate, branched paraphyllia ; 4-8 inches long or more, 

 forming large loose mats of a glossy, yellowish brown or olive 

 green colour; stems more or less frequently divided, with very 

 regular bipinnate, complanate, close branching, occasionally 

 tripinnate, very rarely pinnate only ; branches and branchlets 

 slender, attenuated, often a little curved at points. Stem-leaves 

 often crowded, nearly erect when dry, widely ovate or ovate- 

 oblong from a broad insertion, more or less abruptly acuminate, 

 the point short, straight and obtuse, or variously elongated, 

 flexuose, transversely undulate, and slender ; plicate at base, 

 decurrent, concave, somewhat incurved at margin and channelled 

 at point, f-ij lines long, with more or less numerous, scattered, 

 acute, spinulose papillas at back, especially above ; margin slightly 

 recurved at base, more or less strongly denticulate above, with 

 fine, often spreading teeth ; nerve double, reaching to one-fourth 

 or one-third the length of the leaf; cells linear, flexuose, 8-10 

 times as long as wide, almost uniform to base ; the basal orange, 

 a little larger and incrassate, but not wide, nor distinct at angles. 

 Branch-leaves much smaller, more or less imbricated, concave, 

 elliptical-oblong, not plicate, obtusely pointed or slightly acute. 

 Perichaetial bracts long, the inner erect, sheathing. Seta about 

 1 inch long. Capsule orange-brown, ovate-oblong ; lid rostrate. 



Hab. Heaths, mountain woods, etc., common. Fruiting less commonly, in 

 spring. 



