CAMPYLOPUS. . 93 



obscure denticulations for a little distance below ; tubular with the 

 margin incurved from near base or somewhat higher up ; nerve 

 thinner and less opaque, with wider cells ; rather narrower, 

 usually about % the width of the base, but somewhat variable, 

 smooth at back ; in section resembling the previous species. 

 Cells at base rectangular, rather wide, quickly becoming 

 rhomboid, above rhomboid with rounded angles, or oval ; auricles 

 large, inflated, hyaline or coloured. Fruit unknown. 



Var. /S. hamatus Schp. Stems shorter, stouter ; leaves very 

 densely imbricated, broader, hamato-secund. 



Hab. Peat bogs and moors ; Hebrides ; Skye. The var. j8 in N. Uist, with 

 the type. 



Nearly resembling C. Schwarzii, this fine species is distinguished by the still 

 taller and more robust habit, and the longer leaves of somewhat different form. I do 

 not think much reliance can be placed on the relative commencement of the incurva- 

 tion of the margin of the two species, basal or otherwise, for I have found in C. 

 Shawii the margin involute from quite the base more frequently than not, while, on 

 the other hand, this is certainly not a constant feature in C. Schwarzii. A more 

 certain character can, I think, be found in the fonn of the leaf base, that of C. 

 Schwarzii being very short, hardly twice as long as broad, and bearing a very small 

 proportion to the length of the leaf ; while that of C. Shawii is twice as long, and is 

 more suddenly narrowed into the subula. This gives a generally broader appearance 

 to the leaf of C. Shawii, by which it may be distinguished in the field. I have 

 always found the nerve of C. Schwarzii distinctly wider in proportion at the base. 

 Indeed, C. Shawii seems more liable to be confounded with some forms of C. 

 flexuosus ; but that species has a narrower nerve, which is different in section, and 

 the leaves are usually more denticulate above and narrower at the base ; it is not 

 often so robust a plant as our present species, which, indeed, to the unaided eye, 

 more closely resembles some forms of Dicranum Bonjeani than any of the other 

 species of Campylopus. 



It is especially interesting from having been found nowhere but in the Hebrides. 



4. Campylopus flexuosus Brid. (Bryum flexuosum L.) 



(Tab. XVI. E.). 



Extremely variable, in size, colour, and habit ; 5-4 inches 

 high ; as slender as C. subulatus, or almost as tall and robust as 

 the preceding species ; leaves straight, small and rigid, or long 

 and secund, often rather flexuose when dry. Usually in rather 

 dense tufts, tomentose. Leaves lanceolate-subulate from a 

 narrow, oblong base, tubular above, the lower usually reddish at 

 base ; without a hyaline point ; margin usually denticulate for 

 some distance below the apex ; nerve yi-% width of base, cells of 

 the two anterior layers larger, thin-walled, of posterior layers 

 smaller, interspersed with groups of minute, very incrassate 

 opaque cells : areolation rectangular and pellucid at base, with 



