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dents of mosses in the world. The possession of such a classical collection 
by comparative beginners in this study, at any price, is a privilege which is 
now for the first time available. It will aid in the more rapid mastery of the 
rudiments and in earlier initiation of the tyro into the critical study of diffi- 
cult groups of mosses, a field in which the workers are as yet all too few, and 
for which it is hoped the younger generation of students will train themselves 
in rapidly growing numbers by such splendid aids as Dr. Grout’s North 
American Pleurocarpi. Winona, Minn. 
DIE EUROPAEISCHEN TORFMOOSE. 
Nachtragsheft zu den Europaischen Laubmoosen, beschrieben und 
gezeich net von Georg Roth. 80s. II Taf. Leipz. 
(Engelmann) 1906. Preis M. 3.20. 
Roth has given us in the above a supplement to his two volumes upon 
the European mosses, in which the sphagna were lacking, with descriptions 
and illustrations upon the same plan. The book fills a much felt want, as 
Braithwaite’s admirable work (1880) is inadequate to an understanding of the 
forms that have been segregated into species in the past few years, while the 
illustrative work of Warnstorf has been scanty, diagramatic and in so far 
unsatisfactory. The drawings of Roth are on the other hand realistic in 
the extreme, treat admirably the critical points, notably the stem leaves and 
the pore system of the branch-leaves, and should help to dissipate the uncer- 
tainty with which bryologists have been prone to regard the group. Of the 
fifty-seven described European specimens forty-three are definitely known 
from North America, while most of the others are to be expected there, so the 
work is hardly of less value to the American than to the European bryolo- 
gist. The work follows in the main Warnstorf, with consideration of the 
author’s own observations and other contributions upon the subject, a very 
good bibliography of which is given at the outset. Especially has the 
author sought to make available the work of Roll, which has been neglected 
owing to its divergent and isolated nomenclature. 
As compared with Warnstorf’s late's t treatment the following new names 
are to be noted: S. Schliephackei (Roll) Roth, including as variety S. 
Schultzii Warnst., S. pseudorecurvum Roll and S. pseudocuspidatum Roth, 
an attempt as the names indicate to dispose of some of the troublesome con- 
necting links between 5. cuspidatu77i and 5. recurvuTTi. S . pUTigens Roth 
inserted between the already closely related S. I7iu7idatu77t Russ, and S. 
Gravetii Russ. (=S. auricu latu77t Schpr.), S. turgidwn (C. M. ) Roth for 
Warnstorf s S. crassicladu77i , and S. cor7iutu7n Roth for what Warnstorf had 
treated as typical S. rufesce7is Bryol. Germ. As an apparent omission, I 
would note the failure to allude to the recently proposed species 5. ochracewTi 
Glowacki from Carinthia (Jahrb. d. Naturhist. Mus. von Karnten, XXVII, 
Klagenfurt, 1904, accordance to reference). 
An illustration of the pore-structure of the American S. Mendocmeiwi 
Sulliv. is contributed by way of pointing out its distinction from the several 
