1918] CURRENT LITERATURE 481 
In forms so simple in other respects, we might anticipate some simplicity in the 
nucleus. In making phylogenetic charts, there is even greater room for dif- 
ference of opinion, but that room wi come more and more restricted as the 
number of critical investigations increases. In regard to distribution, habitats, 
structure, and biology there is less room for dispute, and these subjects con- 
stitute the most interesting and valuable part of the book. The 271 illustra- 
tions, comprising 1284 lettered or numbered figures, are well drawn, and more 
than half of them are from the pen of the author 
The second volume, with its taxomonic keys, will be awaited with interest, 
for the cosmopolitan habit of most algae makes such keys almost as serviceable 
in the United States as in England.—Cuartes J. CHAMBERLAIN. 
MINOR NOTICES 
Ornamental trees of Hawaii—A book’ upon the introduced trees grown 
for ornamental purposes in the Hawaiian Islands, containing adequate descrip- 
tions and excellent illustrations, should prove a useful and a welcome source of 
inspiration and instruction to the residents of Honolulu and other similarly 
situated towns. To those living in other lands it shows the possibilities of 
tropical islands for the growth of many beautiful and remarkable trees and 
shrubs imported from other tropical countries. Among these trees the palms 
and the legumes stand preeminently first in importance, each family having 
devoted to its presentation a score or more of plates, while nearly double that 
number of species are described. The other families represented are too 
numerous to permit of enumeration. The descriptions are non-technical but 
apparently quite accurate. There is no attempt at any key to genera or 
species, although the importance of such an aid to identification is obvious. 
It is to be feared that without some such assistance and in spite of the numer- 
ous good illustrations the amateur botanists of Hawaii will encounter con- 
siderable difficulty in using the volume to further their acquaintance with 
introduced trees.—Gro. D. FULLER. 
NOTES FOR STUDENTS 
Taxonomic notes.—ARTHUR! has described a new genus (Frommea) of 
rusts, the type being Uredo obtusa Strauss on Tormentilla erecta. 
Bake’ has described two new species of Polygonum, P. achoreum occur- 
ring from Quebec and Vermont to Minnesota, Missouri, Montana, and Sas- 
katchewan; and P. allocarpum occurring along the sea coast of Maine and 
adjacent islands of New Brunswick. 
3 Rock, Josep F., The ornamental trees of Hawaii. 8vo. pp. v+210. pis. So. 
1917. Honolulu. H.I. Published under patronage. 
+ Arruur, J. C., Relationship of the genus Kuehneola. Bull. Torr. Bot. Club 
44:50I-511. 1917. 
5 BLAKE, S. F., Two new Polygonums from New England. Rhodora 19:232-235. 
17 
