EUROPEAN GENERA OF HEPATICiE NATURALLY ARRANGED. 



III. ANTHOCEROTACEiE. 



a. Anthocerote^. 



58. Anthoceros, Mich. | 69. Notothylas, Sidl. 



As an appendix is given a revision of the European species of 

 Ehacomitrium, and also the description of a new species of 

 Zygodon as follows : — 



Zygodon aristatus.— Z/ttfZJ. 



Dioicons, branched, sparingly radiculose ; the leaves dense, 

 erecto- patent, straiglit or a little recurved at apex, somewhat 

 carinate, elongato-lanceolate, the wings at apex of unequal length, 

 that of one side (usually the left) running higher on the nerve, 

 the margin crenulate by the minute papillje ; nerve yellow, thick, 

 strongly prominent at back, excurrent as an arista, which is long, 

 very thick, subterete, pungent, fragile and quite smooth above ; 

 cells pleuren chymatons, quite smooth, but at the extreme apex 

 oblong — oval, and slightly jjapillose, all rather large and strongly 

 incrassate, the basal oval — rectangular or — quadrate, quite smooth, 

 the others roundish, bearing at the thickened circumference 2-5 

 short acute papilla?. 



Hab. — On a beech intermixed with Z. conoides at CromagL^wn, 

 Killai'ney, and on the bark of beech along with Z. conoides and 

 viridissimus at Muckross. 



On a limestone wall at Plymouth (1867, E. M. Holmes). 

 Sweden — Isl. Gotland. (Lindberg). 



ON EIMULARIA LIMBORINA. Nyl. 



(Extract of Letter from Dr. Nylander to the Rev. J. M. Crombie.) 



In " Licheuological Memorabilia," No. 8, the Rev. Mr. Leighton 

 speaks of Eimidaria limborina, Nyl., and declared that it is identical 

 with Lecidea trochodes, Tayl. I do not know what L. trocliodes 

 may really be, but from the figures of section of apothecium given 

 by Mr. Leighton, it is entirely different from R. limborina, such as 



