NOTES ON SCOTTISH HEPATIC/E 235 



Marsnpella Jorgensenii, Schffn., in ' Krit. Bemerk. u. die. 

 eur. Leberm,' in " Lotos," 1901. This subalpine species does 

 not appear to be very rare in Scotland. It occurs on moist 

 stony ground in peaty places on the sides of hills. It is 

 closely related to Mars, erythrorhiza, but has smaller leaf 

 cells. The typical plant also differs in having the sterile 

 stems equally leaved, not rapidly increasing in size towards 

 the apex as in M. erythrorhiza ; leaves broadly rotund- 

 cordate, broadest below the middle, instead of ob-cordate 

 and broadest above the middle as in that species. 



LopJiozia Wenzelii (Nees) is usually given specific rank, 

 though considered by most botanists to be probably an 

 aquatic form of the polymorphic Loph. alpestris. It differs 

 from the latter chiefly in the leaves being broadest above, 

 instead of below the middle. It is also more flaccid and 

 usually lighter in colour. It has been found with us only 

 by Mr. W. West on Ben Nevis at 3500 ft., and on Ben 

 MacDhui. Lophozia longidens (Lindb.). This is probably 

 a good species, though considered by some authors as a 

 variety of Loph. ventricosa. It is readily distinguished 

 from the latter by its reddish gemmae and deeper sinus of 

 the leaves with long narrow lobes. The squarrose habit and 

 the thin-walled leaf cells also assist in identifying it. A full 

 description is given in Lindb. and Arnell's " Muse. Asise 

 Bor.," p. 50. 



Plagiochila exigua,Tay\. I have given this in the " Census " 

 as being the same species as Flag, tridenticulata, Tayl. It 

 is in my opinion only a state of the latter due to being in a 

 very moist and shady position. I have gathered plants on 

 the west coast of Scotland with stems having all the de- 

 scribed characters of P. exigua, in size, texture, and shape of 

 leaf, long subulate persistent stipules ; and such stems I 

 have been able to trace to their junction with stems of 

 undoubted P. tridenticulata, with the characteristic male 

 inflorescence. Herr Kaalaas, to whom I sent specimens, is 

 inclined to think that this view of the two plants is correct. 

 He adds, " I also consider the fact that trifid leaves some- 

 times occur in specimens of P. exigua. This is at all events 

 the case in the specimens which the Rev. Mr. Binstead 



