CURRENT LITERATURE 389 
sTLy Zimmermann” has described some remarkable bacterial 
hich occur in leaves of various Rubiaceae (Punetta lanceolata, P. 
ugustifolia, P. indica, and Grumilea micrantha). These nodules consist of 
ses of spongy parenchyma, the intercellular spaces of which are filled 
wih bacteria. No mention is made whether the bacteria in any way affect 
cell walls. The author supposes that the bacteria get into the leaves 
through a stomate which he finds immediately above each nodule on the upper 
af surface. He made no determination as to a possible causal relation 
between the nodules and the bacteria, reserving this for further study.— H. 
v 
EW. OLIVER has described a sporangium of one of the paleozoic ferns, 
awhich an interrupted ring of tracheal elements occurs between the wall 
and the sporogenous tissue, in the position of a tapetum. The tracheae are 
thin-walled and exhibit well-marked pits of the reticulate type. He 
ed to refer the sporangium to the Botryopterideae, and since ee 
hold certain anatomical relations to the Cycadofilices, this vance 
um becomes suggestive of the possible character of the unknown : 
fain the latter group. Of course the occurrence of t cheal ech ae 
po rie of gymnosperms and certain angiosperms ne ae 
SEWARD and ELIzABETH DALE” have described the four 
the affinities of the genus ) 
these characters with those presented by 
er part of the Mesozoic.—J.M.C. 
~**ING THE EMBRYO of Nymphaea, Henry S. > 
= {compare it with that of Nelumbo as recently des 
ed in this journal (33: 165. 1902.) There 
ae Tyo ” consisting of hundreds of cells, but » 
Pensor of three to five cells in linear series. » 
ANN, A., Uber Bacterienknoten in isa . 
07. Wl. #. 1902. : ; oe 
ag ture and affinities of Dipteris, with notes OP 
néimae. Phil. Trans. Roy. Soc. London 19434°7°2 
