30 ON NA1AS GBAMINKA DEL., VAR. DELILEI MAGNUS. 



Fig. 33. Transverse section of the leaf of N. graminea Del., from Celebes ; 

 enlarged »■} °. Magnus, ' Beitrage,' pi. vi., fig. 1. . 



In Figs. 31—33 the leading bundles are drawn schematically : 

 i = intercellular spaces, 6 = bast-cells. 



34. Isolated bast-cell from the leaf of N. graminea from Celebes ; enlarged 



'I 2 . Magnus, ' Beitrage,' pi. vi., fig. 4 6. _ ,-,•■■ 



35. Male flower of N. graminea ; enlarged V- Magnus, ' Beitrage, pi. m., 



fig- 6. . . _ 



36. Transverse section of the stem of Gaulinia alaganensis. Jirom 



' Tavole per una Anatomia delle piante aquatiche,' Parlatore, pi. vi., 

 fig. 3. 



37. Surface- view of the outer cell-layer of the unripe seed of N. flexilis ; 



^ 3 . Magnus, 'Beitrage,' pi. v., fig. 9. 



38. Diagonal section of the nearly ripe seed-shell of N. flexilis : enlarged 



Jf 8 . Magnus, 'Beitrage,' pi. v., fig. 8. 

 39_40. Diagonal sections of the still (?if not always) unripe seed-shell of 

 N. graminea from Cairo ; enlarged ■ -J 8 . 



41. Diagonal section of the quite ripe seed-shell of N. graminea from 



Cairo; enlarged >f 8 . Magnus, 'Beitrage,' pi. v., fig. 12. 



FlGCKES IN THE LETTERPRESS. 



All the figures are drawn from Beddish specimens of Naias graminea 

 Del., var. Deliiei Magnus, except when stated otherwise. 



42. N. graminea. — Transverse section of stem, drawn diagrammatically ; 



enlarged y. 



43 and 44. N. graminea. — Ends of leaves, showing dentition ; enlarged y . 



45 and 46. N. flexilis. — Spines on marginB of leaves, from specimens 

 collected by Dr. Boswell, in Loch Cluny, near Blairgowrie, Perth- 

 shire; enlarged "f". See 'Journal of Botany,' No. 154, 1875, 

 p. 297. 



47 to 49. N. graminea. — Spines on margin of middle portion of leaf ; 

 enlarged »-$•. 



50. N. minor. — Tooth of leaf from one of Archbishop Haynald's speci- 



mens from ponds in his park at Kalocsa, Hungary ; enlarged *f ". 



51. N. major. — Tooth of leaf from plant collected near Coblentz, by Dr. 



Ph. Wirtgen^ enlarged >f °. 



52. N. graminea.— Large leaf -sheaf from leaf of first pair ; enlarged y . 



53. N. graminea— -Usual form of leaf-sheaf from leaf of first pair; en- 



larged y. 



54. N. graminea. — Usual form of leaf-sheaf from leaf of first pair, with 



irregular-sized auricles ; enlarged y. 



55. N. graminea. — Leaf -sheaf from leaf of second pair; enlarged y. 



56 and 57. N. flexilis. — Leaf-sheath from Scotch specimens ; enlarged y . 



58. N. graminea — Spines on margin of auricles; enlarged 1 f e . 



59. N. flexilis. — Spines on margin of auricles from Loch Cluny. They are 



the firBt four which occur on the left shoulder of Fig. 57, above the 

 minute spine, nearest the base of the sheath ; enlarged 1 |«. 

 60 to 65. N. graminea. — Transverse sections of leaves, beginning near the 

 summit; enlarged y. 



66. N. alaganensis. — Libriform cells in margin of leaf, from Malinverni's 



Italian specimens ; enlarged >-f ». The libriform cells are the long 

 cells without cell-contents. 



67. N. graminea. — Young antheriferous and pistilliferous flowers growing 



side by side ; enlarged \f. 



68. N. graminea. — Older antheriferous and pistilliferous flowers growing 



side by side ; enlarged y. 



69. N. graminea. — Portion of central infloresence ; enlarged y . 



70. N. graminea. — Pistilliferous flower with contiguous bracts ; enlarged ' » . 



71. N. graminea. — Young pistilliferous flower ; enlarged y . 



72 and 73. N. graminea.— Young pistilliferous flowers, showing the stie- 



niatoid appendages ; enlarged y . 

 74 and 75. — N. graminea. — Young antheriferous flowers ; enlarged y. 

 76. N. graminea.— -Young antheriferous flower, showing immature pollen • 



enlarged; y. ' * 



