io6 ANNALS OF SCOTTISH NATURAL HISTORY 



cells, the middle row of opaque, then pellucid cells, enlarging 

 downwards from 6 to I 2 p, diam., on both sides of this row 

 groups (at times large) of sterei'd cells, anterior row of very 

 small cells, especially near the middle of leaf, where they 

 are often scarcely perceptible, enlarging a little downwards 

 from 3 to 5/1,, posterior row of cells somewhat larger, 

 also enlarging downwards, from 4 to 7 /* ; towards the base 

 of leaf the posterior cells appear close to posterior surface, 

 as alternately slightly elevated and depressed. The bulging 

 posterior cells, seen on the back of nerve from the apex 

 downwards, are rather variable in this species, but, when 

 fully developed, they may be said to vary from 9 to 6 ^ in 

 height, decreasing downwards, and often reach the middle 

 of the leaf, where they degenerate into minute, opaque 

 irregularities on the posterior surface of the nerve. Dis- 

 covered in Harris, 1900, and a description published in 

 January 1901. 



Mollia Haggartii (Strn.). Plants rather closely aggre- 

 gated ; stems simple or rarely divided upright, from -J- to -^- inch 

 long, radiculose below, radicles pale, jointed and minutely 

 papillose ; leaves laxly disposed below, more closely set 

 above and longer, closely incurved or circinato- incurved 

 when dry, nearly straight and spreading when moistened, 

 length from i to 1*5 mm., oblong! or oblongo-spathulate, 

 broad at apex and there deeply cucullate ; surface strongly 

 and coarsely papillose back and front, as well as on the 

 margins which, around the blunt apex, may be said to be 

 coarsely crenato-papillose, papillae large, hemisphaerical, from 



4 to 6 JJL in height ; nerve near base pale, one-fourth to one- 

 third the breadth of the leaf, narrowing upwards where the 

 leaf is broadening, prominent on back, ceasing below the blunt 

 apex, composed internally of cells irregularly disposed in 3 to 



5 rows, papillose in front, nearly smooth behind, thickness from 

 50 to 65 /z ; areolation of pagina in the lowest fourth, large, 

 hyaline, exactly as is Mollia tortuosa, where also, the oblong 

 cells slope up to a point on the margin, size of these cells, 

 40 to 70 by 8 to I i ft; immediately above this space there is 

 another narrow one of small clear cells, quickly succeeded 

 by dense opaque, roundish-quadrate, obscure cells, strongly 



