178 ANNALS OF SCOTTISH NATURAL HISTORY 



the leaves not being papillose, and in their apices quite entire 

 and much narrower, etc. 



Dicranuin leiophylliun. Tufts large, rather lax, of a dark- 

 green colour above, brown beneath, slightly radiculose ; stems 

 simple or bifurcate, about half an inch or more long ; leaves 

 ovate lanceolate, narrowly subulate, much curled when dry, 

 laxly spreading when moist, slightly clasping the stems 

 where they are broader, but rather quickly narrowing into 

 the long subulate upper portion, which is quite entire and 

 a little rounded at apex, but narrow, about .03 mm. broad, 

 not papillose, margin plane, entire, but a little incurved 

 upwards ; nerve, .06 5 -.08 5 mm. broad near base, tapering 

 and vanishing below apex ; auricles well developed, cells 

 large, colourless at first, then with thick, brownish walls, 

 oblong or oblongo-hexagonal, .03-. 045 by .oi3-.Oi8 mm., 

 central basal cells granular, narrow, cylindrical, .O4-.O6 by 

 .0045 -.006 mm., outwards shorter, broader until near margin, 

 much the same as those just above, upwards gradually short- 

 ening into the dense, distinctly separate, opaque, quadrate or 

 rounded, granular cells above, .OO7-.OI mm. across, but near 

 margin always smaller (.00 5 -.008 mm.) than cells found 

 quite at apex ; seta (often two from one perichaetium), pale, 

 then reddish, long, strong ; capsule erect, oblong, brown ; teeth 

 dicranoid but broken ; lid (in young capsules) long, subulate 

 above, not much shorter than capsule. The fruit is either 

 that of the previous year, or too young for examination. 



The upper cells of the leaf have a distinct resemblance 

 to those of Ampkoridium Mougeotii in their peculiar opacity, 

 in being faintly striated longitudinally, and in showing 

 slender connecting tubes with neighbouring cells, especially 

 in a vertical direction. 



I have seen the same peculiarities in several other mosses 

 but more particularly in Bartrainia Oedcri (Sw.). 



TricJiostonimn episemwn. Tufts rather dense, having 

 much the appearance of those of Tr. brachydontiiun ; stems 

 strong, about one inch in length, leaves oblong, reflexed 

 when wet, obtuse and rounded at the apex as in Tr. litorale ; 

 nerve strong, pale then red, .085-.! mm. broad near base, 

 tapering and excurrent in a short stump, margin plane, 

 crenulated above from projecting cells as well as papillose ; 



