38 BOTANICAL GAZETTE [JULY 
13. Macnus, P., Uber die Anatomie der epee a fare a Sitz.-Ber. 
Gesells. Nat. Freunde Berlin 1870. 
14. OSTENFELD, C. H., Contributions to West Australian botany. Part I. 
Introduction. The sea-grasses of West Australia. Dansk Bot. Arkiv 
2:1-44. 1916. 
15. RAUNKIAER, C., De Danske Blomsterplanters ee I. Enkim- 
bladede, 1. Helobieae. 1-138. Copenhagen. 1896. 
16, SAUVAGEAU, C., Sur les feuilles de pape Sioniecky ica aquatiques. 
Ann. Sci. Nat. VIL Bot. 13:103-296. 1891 
, Sur la feuille des Butomées. Ann. Sd, Nat. VII. Bot. 17: 295-326. 
1893. 
18. SEUBERT, M., in Marttvs, Flora Brasiliensis 3: part 1. 1842-71. 
19. SOLEREDER, H., Systematisch-anatomische cee - Blattes der 
Hydrocharitaceen. Beih. Bot. Centralbl. 30:24—-104. 
. WACHT W., Beitrage zur Kenntniss einiger Waesidaicet: Flora 
83: oa: 1897. 
EXPLANATION OF PLATE I 
The plate shows the xylem in black, the phloem in white, the fibers (f) 
saieeee As the outlines of lacunae in dotted lines. 
1.—Sagittaria of S. teres group: transverse section of limb of leaf f, 
interest fibrous sheath of bundle (slight asymmetry of section probably due 
to incomplete recovery of edo —— used; Georgia Plants. Roland 
Harper. 1473. Ex Herb. Brit. 
Fic. 2.—Sagittaria sagiitifolia 1 e Sea section of petiole close to 
blade, fibrous bundle — (less highly developed than in species shown in 
fig. 1) not indicated; 
Fic. 3. Sastiote sanueoles L.: transverse section of saat ribbon leaf, 
X23 
Nv 
° 
Fic. 4.—Tetroncium genenageanss Nee transverse sections of leaf; 
A, sheath, B, transition to limb; C, limb; 
G. 5.—Limnophyton oblscss! olden Mia: are of Jen; a, em b, b’ cusp 
veins poets of margin probably an effect of drying); Xo 
ms 1G. 6.—Alisma parnassifolium Bassi var. majus, blade of nae Xo.5. 
7.-—Scheuchzeria palustris L.: transverse section of limb of leaf; 
7 Pit strand occupying one margin (on ne of small scale, fibrous 
sheaths of bundles not separately indicated); 
Fic. 8.—Alisma oi ioe ss Griseb.: blade of leaf; 2, v’, principal 
veins of auricles; Xo 
Fic. sc Sagane Greseit Smith.: blade of leaf; a, midrib; 6, b’, cusp 
veins; Xo.5. 
G. 10. fates manatorum Aschers.: transverse section of limb 
of ne a 
Fic. 11.—Cymodocea isoetifolia Aschers.: transverse section of limb of 
ome sens indistinguishable, in smaller bundles surrounding median bundle; 
ee 12.—Cymodocea nodosa Aschers.: transverse section of limb of leaf; 
3, 
