Band 107. Nr. 20. 
XXIX. Jahrgang. I. Bd. Nr. 20. 
Botanisches Centralblatt. 
Referirendes Organ 
der 
Association Internationale des Botanistes 
für das Gesamtgebiet der Botanik. 
Herausgegeben unter der Leitung 
des Präsidenten: des Vice-Präsidenten: des Secretärs. 
Prof. Dr. R. v. Wettstein. Prof. Dr. Ch. Flahault. Dr. J. P. Lotsy. 
und der Redactions-Commissions-Mitglieder: 
Prof. Dr. Wm. Trelease, Dr. R. Pampanini und Prof. Dr. F. W. Oliver. 
von zahlreichen Specialredacteuren in den verschiedenen Ländern. 
Dr. J. P. Lotsy, Chefredacteur. 
No. 20 
Abonnement für das halbe Jahr 14 Mark 
durch alle Buchhandlungen und Postanstalten. 
1908. 
Alle für die Redaction bestimmten Sendungen sind zu richten an Herrn 
Dr. J. P. LOTSY, Chefredacteur, Leiden (Holland), Witte Singel 26. 
Chrysler, M. A., The nodes of grasses. (Botan. Gazette. XLI. 
p. 1-16. Pis. 1, 2. Jan. 1906.) 
The author traces the bundles of the stem and finds that their 
course departs considerably from the conventional monocotyledon 
type described by Von Mo hl. 
Amphivasal bundles are found to occur at the nodes in most 
grasses, and are nearly as common in the aerial as in the subter- 
ranean portions of the stem. These bundles are formed in two ways: 
1) Certain leaf trace bundles enlarge at the nodes due in a large 
measure to an increase of the xylem elements which gradually 
close around the phloem, 2) Collateral bundles fuse in pairs. 
In the internodes the bundles, unless crowded, are of the col¬ 
lateral type. The same type is also the only kind found even at the 
nodes of the more highly specialized grasses. 
The author invariably finds amphivasal bundles of the second 
type however in the reproductive branches, a phenomenon that 
lends color to the view that these bundles are primitive in structure. 
A tissue believed by the author to be cambium occurs in the 
cauline bundles of many grasses just above the node, or in the 
leaf traces near the base of the leaf sheath. 
Such anatomical features in grasses as the following point, in 
Professor Chrysler’s judgment, to their being a more highly spe¬ 
cialized family than the sedges, 1) the occurrence of a holiow stem, 
2) the less frequent occurrence of amphivasal bundles in grasses 
than in sedges, 3) the leaf traces in at least two ranks, and 4) the 
Stele of the floral axis is never as simple as it is in certain sedges. 
J. Horace Faull. 
82 
Botan. Centralblatt. Band 107. 1908. 
