178 ANNALS OF SCOTTISH NATURAL HISTORY 



most third as well as on the back of the nerve in the same region. 

 The nerve is also excurrent, at times longly so. The central basal 

 areolation is also much longer than in the ordinary form. The most 

 characteristic specimens were found at Taynuilt at a considerable 

 distance from the sea, as well as near Loch Killisport. 



BRYUM PARASEMUM. Closely tufted; stems short, simple or 

 occasionally branched ; leaves rather closely imbricated, slightly 

 narrowed at the base, broadly obovate, very concave, obtuse and 

 rounded at summit; almost cucullate ; nerve about 50 broad near 

 base, tapering rapidly and not quite reaching the summit ; margin 

 entire, not recurved but plain, and not formed of narrower cells ; 

 very laxly areolated, cells not chlorophyllose so far as observed, 

 with thin walls, oblong or bluntly rectangular, 30 to 50 by 15 to 22, 

 of nearly the same size throughout, but a little smaller upwards, 

 and rather more rhomboid. 



In sandy hollows near Stevenston, Ayrshire, 1863. Although 

 there are several under this section of the Brya with broad, hollow 

 leaves, I cannot identify this moss with any. Wilson pronounced 

 in its favour, but I cannot recall whether or not he gave a name to 

 it. I rather think he waited to see whether fruit might be found. 

 I have not been in the locality since. 



ISOTHECIUM INTERLUDENS (n. sp.}. The other day I alighted 

 on a small parcel of mosses which I had long reckoned as irretriev- 

 ably lost. This parcel consists of five specimens of what the late 

 Mr. Wilson, author of the Bry. Brit., persisted in identifying with 

 Brachythedum gladale. As 1 dissented from this decision, I pub- 

 lished, in 1865, a description of the moss under the name Isothecium 

 intermedium, which I now change to /. interludens, owing to the 

 former name having been previously given to a Hypnum, even 

 although the moss referred to is now classified under the genus 

 Bryum. As I have detected stolons in three of the specimens, such 

 as are found in Isothecium, I have been induced to submit the 

 leaves under the microscope, when additional corroboration of my 

 former opinion has been obtained. The cells of the pagina are 

 long, very narrow, nearly cylindrical, and quite distinct and detached 

 from one another, while in the basal-alar spaces the cells are small, 

 oval, yellow or reddish-brown and opaque, owing to the granular 

 contents, both conditions exactly as in Isothecium. I may mention 

 that the moss was found by the late Mr. A. M'Kinlay and myself 

 on almost all our western mountains of any considerable elevation, 

 as Ben Ledi, Ben Voirlich (by Loch Lomond), etc. : also on Ben 

 Lawers. 



The following is a rather fuller description : 



Stems erect, strong, reddish, fastigiately branched, branches 

 often slightly arched ; leaves straight, very seldom slightly secund, 

 erecto-patent both in a dry and wet condition, concave, cordate 



