1916] CURRENT LITERATURE 333 
by experiment that the plants grow as well suspended from a raft by means 
of cloth strings as they do when attached naturally to the rocks by their own 
holdfasts. She found also that the removal of the holdfast and evén of a 
considerable portion of the stipe does not affect the growth of the remainder 
of the plant. The removal of the tip of the blade produces only a negligible 
effect so long as the basal portion is left intact. Pieces of the blades even as 
sma. I mm. square were found to grow when placed in a cloth bag attached 
to a raft. In kelps having a very short stipe it was found that the region of 
greatest growth in the post-juvenile stages is near the base of the blade, the 
main growth of the stipe occurring during the younger stages. She found 
that the kelps experimented upon grow almost ,twice as rapidly during the 
daytime as during the night. 
The results reported coordinate well with the small degree of physiological 
specialization of parts that is found in such genera as Laminaria and other 
leaflike kelps. The data are interpreted largely from the viewpoint of their 
bearing on the location of the region of greatest growth. Only slight attention 
is given to the interpretation of the data in their relation to regeneration, and 
hone at all to their relation to coordination —GrorcE B. Ricc 
Taxonomic notes.—BRANDEGEE™ has described new species in Aristolochia 
(2), Jatropha, Lycium, Galvesia, Maximowiczia, and Orobanche from Lower 
ifornia; in Aristolochia } and Asclepias from Mexico; and in Sedum and 
Aitirhinien from Califo 
AXON,?3 in cntouition of his studies of tropical American ferns, has 
presented three groups of Polypodium, “whose species have for the most part 
been greatly misunderstood.’ One of these groups is P. trichomanoides and 
its American allies, including a critical discussion of 26 species. Another group 
is P. furfuraceum and related species, including 21 species, 5 of which are new. 
The third group is P. sguammatum and its allies, including 17 species, 5 of which 
are new. In addition to the new species in these groups, 5 additional new 
species of Polypodium are described, and 2 new species of Notholaena. 
MILLsPpaucGuH,* in continuation of his studies of North American Euphor- 
biaceae, has recognized the following segregates from Euphorbia: Chamaesyce 
5. F, Gray, with 9 new species and 84 old ones; Eumecanthus KI. and Gke., 
to which 41 species are transferred; Aklema Raf., to which 19 species are 
transferred. New species are also described in Acalypha (2), Croton (3), and 
ragia.—J. M. C. 
ease T. S., Species novae vel minus cognitae. Univ. Calif. Publ. Bot. 
6: te 
73 Maxon, ie R., Studies of rae American ferns. no. 6. Contrib. 
U.S. Nat. Hetb. deci pls. 32-43 
*4Mictspaucn, C. F., Sein to North American Euphorbiaceae VI. 
Publ. Field Mus, Nat. Hist. Bot. Series 2:401-420. 1916 
