ro1t] CURRENT LITERATURE 237 
of notice by our American workers. The mature galls were taken into the 
the plant tissue. The “growth enzyme”’ is from the larva, and e gall 
kes ac 
galls. He also states that the character aig ee somewhat upon the part 
of the host plant on which the gall is form 
KUsTER® gives a brief discussion and ee of one of TROTTER’S’ recent 
papers, in which he compares the protoplasmic and histological characters 
er 
He calls attention to the necessity of comparative study of the structure of 
gall with the normal structure of the plant. The galls and dicot stems both 
have the radial arrangement of parts, with parenchyma tissue in the center, 
but the fibrovascular bundles of the galls are not so well developed as in the 
stems. KUsTer sees enough differences in structural characters to prevent 
agreement with TROTTER, but does not go into an extended discussion of these 
differences. 
REVILLIUS® gives a very ranach discussion of certain pseudo-galls 
or ead tedinate The first of these was briefly described by Rus- 
SAAMEN IQOI. e author agrees with RUBSAAMEN, but gives a more 
detailed PRE The insect attacks the upper surface of the leaf, causing 
the tips to curl. The upper epidermis is seriously injured and the mesophyll 
somewhat distorted, but the palisade cells only slightly changed. The meso- 
phyll is poorer in chlorophyll than in the normal leaves. When the buds are 
attacked they fail to develop. A similar gall not previously described occurs 
on S. graminea. A Thysanopterocecidia on the Polygonum Convolvulus is also 
described, but in this the insect attacks the under surface of the leaves. The 
structural characters are practically the same as the preceeding. 
The LEEUWEN-REIJNVAANS® give a fourth paper on the cecidia of Java, 
‘Kis STER, geen be die. Sprossihnlichkeit der protoplasmatischen Gallen. 
Marcellia 9:159, 
7 TROTTER, “ es a di una omolgia caulinare nelle galle prosplastiche. 
Marcellia 9: 109. 1911. 
§ GREVILLIUS, Dr. A. Y. von, Notizen ueber Thysonopterocecidien auf Stellaria 
media Cyr., S. graminea L., und Polygonum Convoloulus L. Marcellia 9: 161-167. 
1gto 
ice UWEN-REIJNVAAN, J. eae W. Doctors, Einige Gallen aus Java. Vierter 
Beitrag. Marcellia 9: 168-193. 
