1'I.AÏK I. 



Udotea (figs. 1—28, 36—68). 



orientalis a. sp. Habit of plant, nat. size. (Landu Bay, Rotti, reef, Siboga Expc<liti<ni i. 



1 U. cyathifortnis Decaisne. Habit of plant, nat. size. tlles «les Saintes, Guadeloupe, D'AvrainvilU 



in Hcrb. Mus. l'.uis. l)i-.i '.u>NE's type). 



i ;. I'. glaucescens Harvey. Habit of plant, nat. size. (Fricndly Islands, Harvey. n" 82, in Herb. 



Mus. Brit.). The frond consists of two lamcllae, the smaller superposed on the larger; they 

 both arise from the same stipes, whicfa is inconspicuously divided at its upper end. 



Fig. 4. U. orientalis. Surface view of frond filaments of plant showh in fig. i ( before decalcification. 20. 



Fig. 5. U. glaucescens. Surface view of frond filaments of plant shown in fig. 3, before decalcification. 20. 



Fig. 6. U. cyathiformis. Filaments of frond of fig. 3 after decalcification, showing sessile even constrictions 

 eironeously made to appear septate) above the dichotomies. • 83. 



Fig. 7. U. glaucescens. Filaments of frond of fig. 3 after decalcification, showing two dichotomies and a 

 trichotomv; the constrictions are all more or less badly represented in this figure, especially 

 those of the upper dichotomy, which ought to be markedly uneven (as in fig. 47) and not 

 sessile. < 83. 



Fig. S. ('. glaucescens. it. Lateral appendages of filaments of stipes with the apices inadequately rendered, 

 83; b. single apex of same, ■ 472. 



Fig. 9. U. cyathiformis. Khizoids springing from a root-axis, 83; a. the same, > 2. 



Fig. 10. ('. palmetta Decaisne. Habit of plant, nat. size. (DECAISNE'S type, Coll. du Petit Thouars in 

 Herb. Mus. Paris). 



Fig. 11. U. palmetta. Filaments of frond, showing lateral appendages both simple and forked and trifid, 

 usually sessile (rarely shortly pedicellate), arranged along one side of the filament. As explained 

 in the text, the lateral appendages are borne only on the exposed portions of the filaments, 

 which constitute the frond, viz., along that side which formed part of the external surface of 

 the frond. a. and b. side view, • 178. In a there is between the appendages a bare space, 

 which was filled by another filament crossing it externally. <". surface view, scen from above, 

 178. d. 472. 



Fig. 12. U spinulosa Howe. Filaments of frond showing lateral appendages, forked and spinose, occurring, 

 as explained under fig. 11, only on the exposed side of the filament. 83. This filament, 

 being situated in a thin part of the frond, emitted appendages here and there where exposed 

 on each surface of the frond. b. apex of filament 83. c. single lateral appendage with three 

 acute spines, 473. (Specimen without locality, in Herb. Chauvin). 



