1904] CURRENT LITERATURE 399 
IN A NEW Contribution from the Gray Herbarium, B. L. Robinson* 
publishes under the following titles: ‘‘Diagnoses and synonymy of some 
Mexican and Central American Eupatoriums,”’ nine new species being 
described ; “Synopsis of the Mikanias of Costa Rica,” eleven species being 
recognized, three of which are new; “ Notes on the genus Mimosa in Mexico 
and Central America,” six new species being described; “ Notes on some 
Polygonums of western North America,” three new species of §Avicularia 
being described and the diamorphism of P. dongistylum Small noted; “New 
spermatophytes of Mexico and Central America,” new species being described 
in Hechtia, Cerastium, Parnassia, Penstemon, Piptothrix, Brickellia (2), Ver- 
besina (2), and Liabum.—J. M. C 
J. C. ARTHUR” has pointed out the taxonomic importance of the sper- 
mogonium, the common conception that it is an accompaniment of the 
aecidium, or other spore-forms, being incorrect and misleading. After an 
interesting discussion of the varying life-cycles of the rusts, the statement 
is made that a record of the presence of the spermogonium, and the spore- 
generation with which it is associated, gives valuable information regarding 
the probable length of the cycle. If spermogonia and uredospores are found 
arising from the same mycelium, aecidia do not occur in the cycle; and if 
spermogonia and teleutospores are found arising from the same mycelium, 
there are neither uredo nor aecidia in the cycle. It is also stated that posi- 
tion, form, color, and size of the spermogonium are characters worth record- 
ing for taxonomic purposes.—J. M. C. 
GOEBEL’s sTUDIES on Regeneration in Utricularia® show that in the 
aquatic members of this genus production of adventitious buds occurs in the 
“leaf” forks and on the stalk of the bladders. In Y. exa/ata budding occurs 
on leaves attached to the plant only when all vegetative points on the shoot 
axis are removed; hence the author emphasizes the importance of the princi- 
ple of correlation. Localization of the regenerating region is ascribed not 
to the embryonic condition of the tissues in the leaf forks, but to the predis- 
position to building at places where the conducting system branches. In 
terrestrial species, if the tip of a leaf is cut off, buds appear on the cut sur- 
face of the attached part, but the ability to regenerate decreases rapidly as 
the base of the leaf is approached. Leaves of Pinguicula removed from a 
plant show regeneration of a more usual type, in that the adventitious buds 
are produced on the cut surface at base of the leaf.— M. A. CHRYSLER. 
28 RoBINSON, B. L., Contributions from the Gray Herbarium of Harvard Univer- 
sity. New Series. no. XXVII. Proc. Boston Soc. Nat. Hist. 31 :247-271- 1904. 
2 ARTHUR, J. C., Taxonomic importance of the spermogonium. Bull. Torr. Bot. 
Club 31: 113-124. 1904. 
% GOEBEL, J., Morphologische und biologische Bermerkungen. 15. Regeneration 
der Utricularia. Flora 93: 98-126. figs. 17. 1904 
