NEW AND RARE SCOTTISH MOSSES 107 



papillose, 8 to 1 1 //,, diam. Pagina below unistratose, upwards 

 bistratose next nerve, and in the upper third bistratose through- 

 out, while the marginal cells are unistratose and crenate. 

 Only antheridia with a few paraphyses have been twice 

 detected, situated apparently in the lower portion of the stem. 



A peculiarity is the very slow expansion of the leaves 

 in water. 



A curious moss to me unique. 



On the earth covering the exposed roots of fallen fir- 

 trees in a decaying condition, near Killin, gathered by Mr. 

 D. Haggart, Killin, in April 1900. 



In 1864 I discovered on the "Cobbler," at the head of 

 Loch Long, a moss which Mr. Wilson declared was merely 

 a form of Dicranum (OncopJiorus] polycarpum. I was struck 

 at the time with the large areolation of the leaf, much larger 

 than usual in members of this section. This year, near 

 Killin, I alighted on the same moss with identical areola- 

 tion. Curiously enough, near it grew Weissia crispula, pre- 

 senting at first sight much the same appearance. 



OncopJiorus polycarpoides. In rather loosely aggregated 

 tufts, deep-green above, sordidly brown below ; stems simple, 

 dichotomously or fastigiately branched above ; leaves small 

 underneath, elongating upwards and clustering at the summit, 

 mostly erect but slightly spreading when moist, crisped and 

 contorted when dry, lanceolate-acuminate acute, not papillose, 

 scarcely expanded at the somewhat sheathing base, recurved 

 on the margin in the lower two-thirds, and more broadly so 

 in the middle, plane towards the apex, which is coarsely and 

 distantly toothed ; nerve near the base 70 ^ broad, tapering 

 upwards and lost near the apex, prominent behind, soon 

 turning brown, composed internally of three rows of cells, 

 middle row (3 to 4), of large pellucid oval cells, i I to I 5 p, 

 diam., with numerous sterei'd cells on both aspects of this 

 row, anterior and posterior rows of much smaller cells ; areola- 

 tion of pagina near the base of large rectangular pellucid 

 cells, 30 to 50 by 13 to 1 8 //,, which gradually decrease 

 transversely into the general areolation above, the cells of 

 which are closely set, at first quadrate, in longitudinal series, 

 in a green state compactly granular, lastly containing 

 scattered granules and oil globules and then showing usually 



