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EXPLANATION OF THE FIGURES 
Illustrating Mr. Plowman’s paper on Cyperaceae. 
Fig. 1. Diagrams illustrating the course of the fibro-vascular bundles in various Monocotyle- 
donous stems. The broken lines represent the imaginary inner boundaries of the cortical zone, while 
the nodes are indicated by the horizontal lines. A , Mohl’s plan of the Palm type. B, De Bary’s 
plan of the distichous Palm type. C, plan of bundles in the rhizome of Convallaria ??iajalis. 
By plan of bundles in the rhizome of Acorns Calamus. E , plan of bundles in the stem of 
Tradescantia virginica. F, plan of bundles in the rhizome of Luzula campestris. G, plan of 
bundles in the aerial stem of Scirpus cyperinus. ( C , D, Ey and A' adapted from Guillaud.) 
Fig. 2. Diagrammatic representation of the course of the fibro-vascular bundles in the aerial 
stem of Dulichium arundinaceum. Ay transverse section of part of stem just above a node, 
including the leaf-sheath. B, section passing through the nodal complex. C, section some distance 
below the node. D, projection of fibro-vascular elements from tangential section. E } radial 
longitudinal section of the stem, a.c.l., air- cavity in leaf ; a.c.s., cortical air-space ; c.b., cortical 
bundles ; l.b., leaf-bundle ; l.t., leaf-trace bundle ; n.a., nodal anastomosis ; nd., nodal diaphragm ; 
up., nodal plexus ; s.b., cauline bundle ; leaf. 
PLATE I. 
Fig. 3. Part of a transverse section of the rhizome of Scirpus cyperinus, showing typical amphi- 
vasal bundles in the central cylinder, and centripetal massing of the peridesm in part of the bundles. 
A type of the Amphivasae. x 50. 
Fig. 4. High-power detail of the same, showing endodermal cells thickened on the inner wall, 
and peripheral amphivasal bundles with but slightly differentiated peridesm. x 175. 
Fig. 5. Part of a cross-section of an internode in the culm of Scirpus cyperinus, showing 
cortical and cauline fibro-vascular bundles, cortical air-spaces, and hypodermal sclerotic zone. 
A type of the Sclerocyperaceae. x 40. 
Fig. 6. Collateral fibro-vascular bundle from a transverse section near the base of an internode 
of the culm of Scirpus cyperinus, showing the type of cambial development commonly occurring in 
this region of Cyperaceous culms, x 350. 
