1901] CURRENT LITERATURE 63 
Idaho, the region consisting mainly of rolling hills, destitute of trees and 
and western Idaho. These hills are generally called Palouse hills, and 
hence the title of the book. The manual certainly covers a region of very 
great interest in its unrivaled floristic riches. The keys and descriptions 
seem to be entirely adequate, and, checked as they have been by the large 
field experience of the authors, the manual must give as good a presentation 
of the flora as is possible at present. The nomenclature follows what are 
called the Kew and Berlin rules. Several new species are described, and 
the enumeration of species shows 14 pteridophytes, 9 gymnosperms, I14 
monocotyledons, and 526 dicotyledons. The exceedingly varied conditions 
of the western mountain en will demand the publication of just such 
local manuals as this.—J. M. C. 
HE LIVERPOOL Marine Biological Committee is doing good work in 
publishing short popular papers on the more interesting animals and plants 
in the general region of its activities, the Irish sea. The first three papers 
described animals, but the fourth, just issued, is on Codium,® a very interest- 
ing genus of the Siphonales. Following a general introduction, we have 
presented an account of the structure, reproduction, habits, and distribution 
of this alga. The life history is still incomplete in certain phases of repro- 
duction. There are two forms of sporangia, one producing large green 
zoospores and the other small yellow elements, both however morphologically 
similar and biciliate. The larger green zoospores will germinate vegeta- 
tively, and the problems concern the fate and function of the small yellow 
bodies. They have been supposed to be sperms that should fuse with the 
green swarmers, but no unions have ever been observed. It is probable that 
the yellow zoospores are gametes, which under suitable condition will conju- 
gate with one another. The authors of the paper suggest that the plant is 
becoming apogamous, a view that has support, further than the mere nega- 
tive evidence, in the fact that the hypothetical gametangia at certain stages 
in their development may be reproductive. They are then adventitious buds, 
capable of growing out in a branching filament, which however appears to 
remain attached to the parent plant. The paper is illustrated with three 
very clear plates.— B. M. Davis 
NOTES POR STUDENTS. 
HE POLLEN tube in Cucurbita Pefo according to B. Longo’ traverses 
the tissues of the funiculus and outer integument before entering the 
°GIBSON and AULD: Codium. pp. viii +18. f/s. 3. L. M. B. C. Memoirs. IV. 
vi 
a mesogamia nella commune zucca (Cucurbita Pepo Linn.). Rendiconti della 
a1, 
R. Accademia dei Lincei ro: 168-172. IQOI. 
