53 

 BRAITHWAITE'S BRITISH MOSS -FLORA. 



British Moss-Flora. By R. Braithwaite, M.D., F.L.S., etc. Vol. ii, pt. xi. 



After a very long interval (Part 10 was issued in June 1887) we 

 have again the pleasure of welcoming another instalment of this 

 important publication — one which in all respects keeps up to the 

 high standard attained from the very first issue. The present number 

 commences a new volume (Vol. ii), and contains the first portion of 

 the Grimmiaceae, with descriptions and plates of some forty-four 

 species. The author has, as we think wisely, followed Muller, 

 Mitten, and Lindberg in uniting Racomitrium with Grimmia, as the 

 linear crenulate leaf-cells, which have always been considered as the 

 chief distinguishing character of the former, are not infrequently 

 found in many species of the latter. The genus Grimmia is divided 

 by the learned author into four sections, viz.: — 



1 — Schistiduim, containing the usual three species. 



2 — Eu-Grimmia, 22 species. In this section G. incurva Schwaeg. 

 (1816) is restored as the original name for what has been usually 

 called G. contorta ; G. torquata Hornsch. replaces the more recent 

 specific name torta ;funalis of Schwaegrichten (181 1) replaces spiralis 

 of Wilson's Bry. Brit. ; whilst the funalis of Bry. Eur. = Schullzii of 

 Bry. Brit, is referred to an older name of decipiens, so named by 

 Schultz under Trichostomum (18 17); Dofiiiis very properly substituted 

 for Doniana; linger i (1865) Juratz. becomes alpesiris Schleich. 

 (1827); commutata Hueb. is referred to ovata of Web. and Mohr., 

 and the ovata of most modern authors is the ovalis of Hed. (1792), 

 and is so referred ; Racomitrium sudeticum, Bry. Eur. and Bry. Brit., 

 takes its place here as Gr. microcarpa (Gmel.) Lindb. ; leucophcea 

 becomes campestris Bruch, MSS., 1820. 



In Section 3, Dryptodon, we have G. atrata, /////'color, elliptica 

 (Turn.) Arn. = (Rac. elliptic/cm, Bry. Eur. et Brit.) and patens. 



Section 4, called Trichostomum Hed., includes the remaining 

 species of Racomitrium; R. protcnsum becomes G. aquatica (Brid.) 

 1798? Mull. ; R. heterostichum var. gracilescens becomes G. obtusa 

 (Sm.) 1816, var. (3 alopecurum becomes G. affinis (Schleich.) Lindb.; 

 R. microcarpon becomes G. ramidosa Lindb. — a doubtful native ; this 

 seems a departure from the author's usual plan of adopting the oldest 

 name; R. lanuginosum becomes G. hypnoides L. (Sp. Plant. 1753). 



Coscifiodon cribrosus Hedw., Coniston, 1867, Staveley near Kendal 

 (Binstead, 1886), and Glyphomitrium Daviesii follow in order, whilst 

 Ptychomitrium polyphyllum Auct. is referred to Glyphomitrium under 

 same specific name, and Campylostelium saxicola is included as 

 Gl. saxicola. Ancecta/igium Hed., 1801, is adopted as a generic 



Feb. 1889. 



