120 ‘NOTICES OF BOOKS. . 
‘Notices of Books. 
ha poate og tee "ke. By Cuas. P. Hopxrex. London: Heed ve 
and Co. (Small 8yo, pp. 196.) 
. Tuts hes book ‘i is well printed and elegantly got up, and to a 
student who is already pretty well acquainted with the subject, no 
will be u i racte 
us that though his work is mainly a compilation, yet 
“nearly every species has been carefully examined under the micro- 
scope before being described,” and the characters compared with 
published, descriptions. The ‘work opens with an analysis of genera 
racters derived from the fruit and its parts, trivial ones—e.g., the 
monoicous or dioicous position of the inflorescence, annual or perennial 
duration, &c.—are also introduced. Following these come the deserip- 
which, indeed, are as well marked as natural orders of Phenogamous 
plants. In these descriptions Wilson’s book is closely followed, about 
one hundred additional species beings added, the’ characters. of which 
have been taken from various publicati 
A few critical remarks seem n pis ie Gymnostomum is retained 
as a genus, yet the species calearewm an “commutatum are placed in 
Weissia; these can only be so arranged by those bryologists who regard 
the genus Gymmnostomum as a heterogeneous collection of species, more 
naturally referred to other genera with which they agree in every 
and Didymodon Jenneri an jl ota um Famine: shoull 
have been omitted. ppd: gracilis, Floerke, cannot take precer 
dence of B. Ocderi, Swartz 1800, Swartz having ado opted Gunner’s 
name, Bryum Oecderi —— N orvegica, 1772). Fissidens polyphylius is 
incorrectly referred to the West Indian F' asplenioides. Leucodom 
Lagurus, B., is quiteldifferent from that Moss, ang belongs to Schimper’s 
genus, Myurin um. Leskea sericea cannot be removed far from its ally, 
Hypnum lutescens, and neither it nor nr iby nor tens have cit 
affinity gyi true Leskeas, Thuyidium, Thamnium, and 
certainl a higher position than as sections of "ayn 
Hypnum Stokesit is not distinct from H. prelongum ; H. sulcatum and 
H. Breadalbanense are, doubtless, only forms of commutatum : et 
arcuatum, Lindb., is the same as HI, Lindbergii, Mitt. A third species 
