216 NOTICES OF BOOKS. 
of Wallich, Hooker, Blume and others in the London herbaria, 
has again reversed the whole list. The difference in the number 
of species which he admits, as compared with Mr. Clarke’s list and 
the ‘Synopsis Filicum,’ is not so great as that between — 
British floras. It is not likely that many new species 0 
ferns will be discovered, and the species have now been e 
conte aed sifted that the list as it now stands will probably not 
materially modified by further research. Colonel Beddome 
fie Presl, J. Smith, and Moore, in using genera founded often 
on differences of veining alone. His apne qeaioa are: as might be 
expected, a great improvement upon his earlier w 
Rel 2 Pak «© 
Dr. L, Rabenhorst. Kryptogamen Flora von Deutschland, CEsterreich, 
und Schweitz. “weiter Band. Die Meersalgen von 
etact Hanck. Leipzig, 1883. 
Few algologists have such advantages as Dr. Hanck for carrying 
out the work he has undertaken. Residing, as he does, close to 
charter ae to give all that is iawn of the life-history of the 
rine Algw. Of the three parts already issued, the first contains 
a a copter giving directions for collecting, examining and mounting 
e Algw, followed by another explaining the various terms 
wed i in relation to their reproductive organs. This chapter is parti- 
cularly lucid and concise. Then follows a scheme of classification. 
Dr. Hanck divides seaweed into four groups, according to the colour 
of the endochrome, viz., Rhodophycea, Pheophycea, Chlorophycee, 
and Oydnphigeaa: The characters of each family follow, with a 
list of the genera included in each, the generic descriptions being 
subsequently given under ii respective heads. The arrange- 
ment af the families and genera differs but little from that adopted 
in recent floras, such as Farlow’s ‘ Marine Alge of New England,’ 
or Le Jolis’ ‘ Liste des Algues Marines de Cherbourg,’ and fairly 
nemiacee and Catenella in solitae, but differs from him regarding 
the position of Gloisiphonia, which he has arranged in the Cerami- 
acee, between which and Cryptonemiacee it obviously forms a _— 
The genus ee is distributed as fo llows :—C. (Cha 
ransia) virgatulum, C. Qeaeteny reves Turneri and C. (Mon na 
pedicellatum are atid n the Wrangeliacea, C. Snot Rothit, 
C. (Antithamnion) plana, C. (Antitha a ja and 
C. i eae setae Borreri being aa wit b the vation Ca ill 
n Ceramiacee. C. pluma is not referred to Ptilotham- 
me aichourh it wockd appear . yes as much claim to a generic 
rank as Pleonosporium. In most cases mention made of the 
fructification being unknown ec: this is the case, but it is not 
surprising to find that in a few instances the recorded fructifi- 
