244 ANNALS OF SCOTTISH NATURAL HISTORY 



narrowing upwards, plane and entire in upper half; cells at 

 central base long, narrow, detached, hyaline, straight, not 

 undulated, .04 5 -.07 by .005-7 rnm., shorter outwards and in 

 7 to 10 perpendicular rows near and at margin oblong, 

 often constricted in the middle, cells up from base for a 

 short distance, dark opaque, constricted in the middle, .01- 

 .014 mm., in longer diameter, those in upper two- thirds, 

 quadrate, minute dark and opaque, .oo6-.oi mm. across; 

 margin soon thickened from below by a single transverse 

 terminal couple of cells, farther up two such couples, only 

 rarely are three such couples seen. 



At Loch-nan-Uamb, several miles to the east of Arisaig 

 and near Prince Charlie's Cave ; on stones covered with 

 earth, by the Rev. J. A. M'Caskill of Onich, September 

 1908. 



It is somewhat remarkable and tends to strengthen the 

 theory of a change of type that occasionally, in the lower 

 part of a leaf, instead of the long, narrow, smooth cells, a 

 minute patch is seen consisting of what may be reckoned 

 very minute cells so arranged that if certain little gaps were 

 filled in, the appearance of deeply sinuose cells would be 

 portrayed. In other words this affords a faint but interest- 

 ing indication of its origin. 



The next moss has been under observation for five years. 

 I have waited for the purpose of finding it in a fertile con- 

 dition, but hitherto in vain. It is allied to Ancectangium 

 compactum, a true alpine plant. On the contrary this has 

 only been found on the sea-shore. 



Ancectangium marinum, n.sp. In rather large, strag- 

 gling, sparsely tomentose tufts, quite a contrast, in this re- 

 spect, to the other ; stems about an inch long, pale or 

 yellowish, simple, dichotomously or not unfrequently fastigi- 

 ately branched above ; leaves crisped when dry, straight and 

 nearly upright when moistened, narrowly ovate-lanceolate, 

 acuminate, conduplicate, margin plane, very minutely papil- 

 lose or nearly entire ; nerve pale slender, latit. near base, 

 .O4-.O5 mm., tapering and excurrent in a long, tapering 

 sharp-pointed acumen, .07-.! mm. long, smooth and prom- 

 inent behind ; cells at central base, oblong, separate, 

 .OI8-.O27 by .006-9 mm., outwards smaller, and near and 



