78 BOTANICAL GAZETTE {yoLy 
species distributed among eight genera. The vascular system of the primary 
toot and hypocotyl is typically tetrarch and corresponds with two bundles from — 
each cotyledon without change of position. In some species the root is hexarch; 
in others, variable and anomalous. The occurrence of the hexarch type led the 
author to suspect that a central cotyledonary trace, such as is found in some 
species of Diospyros, had aborted, but no sign of this could be found. In Bumelia 
galt | tal a ph teats cit Ne irl eG ean el i 
tenax the root is usually hexarch. In the upper part of the root and the hypocotyl, — 
four of these bundles differ from the other two in that from them alone rise the — 
lateral rootlets, and also in that they alone are continuous with the bundles of the 
cotyledons.—W. J. G. Lanp. 
Fungus excreta.—A condition almost like that in successive cultures of the 
Chemotropism of fungi.—As part of the larger subject, parasitism, ScHMID? 
has investigated the chemotropism of an unknown species of Phyllosticta, parasiie 
Me ee ee ey a ee 
on pear leaves.9 He is apparently ignorant of FuLTon’s work on this subject” 
and with experimentation that is open to serious objection, comes to the conclusio® — 
that this plant is positively chemotropic. Its chemotropism, however, is not sup" 
posed to come into play at once, “but the fungus itself must first, by enzymatt 
toxic, or purely mechanical means, so alter the normal structure of the epidermal 
cell as to set free a diffusion stream, counter to which, as a directive stimulus, the 
further growth of the fungus proceeds.” This view he promises to support in 
second paper.—C. R. B. 
Culture solutions.—Any who are interested in water-cultures should consult 
a Tecent paper by BENECKE,3* who has been testing the efficiency of voN DER 
CRONE’S solution, in comparison with the older ones. Von DER CRONE es 
oo nearly like Sacus’s, except in the addition of the iron as ferrows 
8 Lurz, Orro, Ueber den Einfluss gebrauchter Nahrlésungen auf die Keimung 
und Entwicklung einiger Schimmelpilze. Ann. Mycol. 7:91-133. 1909- 
79 Scumipt, E. W., Ueber den Parasitismus der Pilze. Zeit. Pflkrankh. 19197 
143. figs. 7. 1908. 
3° Bor. GazETTE 41: 81-108. 1906. 
re BENECKE, W., Die von der Cronesche Nahrsalzlésung. Zeits. Bot. 1: 235-25 
