g6 DICRANACEyE. 



the type, but are connected with it by too many intermediate links to be separated. 

 On the whole, the more robust habit and distinct facies make this a. species not 

 difficult to recognise from C. pyriformis ; and from most of its congeners it is usually 

 distinguishable by its short, neat habit, and shining leaf-bases. It usually grows in 

 smaller, neater tufts, and is more frequently found on rocks than most of the species. 



6. Oampylopus setifolius Wils. (Tab. XVI. H.). 



In large, bright glossy or yellowish green tufts, dark brown 

 below, 4-10 inches high ; rather slender, usually attenuated 

 at point, radiculose only at base. Leaves not much crowded, 

 erecto-patent, not flexuose when dry, shining, very longly 

 setaceous from a short wide base, tubular with the margin 

 involute all its length, denticulate-serrate in the upper part for 

 some distance below the apex, which is not hyaline ; nerve 

 broad, half the width of the base, excurrent, spinosely denticulate 

 above; in section resembling C. flexuosus ; angular cells large, 

 forming wide inflated auricles, red or hyaline ; above the auricles 

 the cells are short, hardly rectangular, shortly rhomboid or 

 elliptic ; very small and rhomboid-elliptic in the upper part of the 

 leaf. Capsules aggregated, ovate-pyriform, lid rostellate, half 

 the length of the capsule. 



Hab. Rocks among grass and heather ; very rare in England, Wales and Scot- 

 land, less so in the west of Ireland. Fruit very rare. 



Another very fine and interesting species, hitherto unknown outside the British 

 Is. It is easily known by the wide auricles and the strongly hispid-denticulate, not 

 hyaline, longly setaceous leaf-points. 



The outer cells of the auricles are usually hyaline, the inner, together with the 

 base of the nerve, deep orange red. 



There is some resemblance between the leaves of -this species and those of some 

 of the species of Dicranum and of Dicranodontium longirostre ; but the present is a 

 more robust plant than most of these, with the leaves not falcato-secund ; and in any 

 case of difficulty it will be certainly dispelled with the microscope, those species at all 

 resembling it in habit having always a much narrower nerve ; D. longirostre var. 

 alpinum is the only one about which confusion is really likely to arise, and this has 

 the leaves less strongly denticulate above, and of a different form at the base, being 

 more quickly narrowed and with the margin more strongly enrolled below, and the 

 nerve narrower. 



7. Campylopus atrovirens De Not. (C. longipilus Brid., 



Schp. Syn.) (Tab. XV. J.). 



Tall, 2-8 inches high, bright green above, black or golden 

 yellow below. Stem soft, very slender, hardly radiculose above, 

 leaves rather laxly placed, long, straight, tubular above from an 

 oblong-lanceolate base, margin entire, nerve half width of base, 

 somewhat variable, excurrent in a hoary, denticulate, very 

 slender hyaline arista of varying length ; in section of about four 



